Added Android Freeware

# Conflicts:
#	README.md
#	app/src/main/assets/Screenshot_9.jpg

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/give-me-some-idea-for-this-app.md

@@ -0,0 +1,11 @@
+---
+name: Give Me Some Idea For This App
+about: If your idea is unique i will definitely implement the Idea and mention you
+  in my repo and add the feature to the app
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+

.idea/AndroidProjectSystem.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>

.idea/appInsightsSettings.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="AppInsightsSettings">
+    <option name="selectedTabId" value="Firebase Crashlytics" />
     <option name="tabSettings">
       <map>
         <entry key="Firebase Crashlytics">

.idea/kotlinc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="1.9.24" />
+    <option name="version" value="2.0.0" />
   </component>
 </project>

README.md

@@ -1,150 +1,181 @@
+![App banner](media/banner.png)
+
 <div align="center">
-  <img src="app/src/main/assets/logo.png" alt="Calculator Hide File App Logo" width="200" />
 
-
-# Calculator Hide File App
+# 📂 Calculator Hide File App for Android 📂
 
 <a href="https://github.com/Binondi/Calculator-Hide-Files/releases/latest">
-      <img alt="Latest release" src="https://img.shields.io/badge/Releases-v1.0-blue?logo=github&style=for-the-badge">
+      <img alt="Latest release" src="https://img.shields.io/badge/Releases-v1.4.2-blue?logo=github&style=for-the-badge">
 </a>
 
 <a href="https://github.com/Binondi/Calculator-Hide-Files/releases/latest">
-      <img alt="Downloads" src="https://img.shields.io/badge/Downloads-1.2k-blue?logo=github&style=for-the-badge">
+  <img alt="Downloads" src="https://img.shields.io/badge/downloads-1.1k-blue?logo=github&style=for-the-badge">
 </a>
 
 <a href="LICENSE">
-      <img alt="Apache License 2.0" src="https://img.shields.io/badge/License-Apache_2.0-blue?logo=github&style=for-the-badge">
+  <img alt="Apache License 2.0" src="https://img.shields.io/badge/License-Apache_2.0-blue?logo=github&style=for-the-badge">
 </a>
 
+
+<br>
+</div>
+<div align="center"> 
+         
+<h4>Download</h4>
+
+<a>[<img src="https://github.com/machiav3lli/oandbackupx/blob/034b226cea5c1b30eb4f6a6f313e4dadcbb0ece4/badge_github.png" alt="Get it on GitHub" height="80">](https://github.com/binondi/Calculator-Hide-Files/releases) </a><a href="https://apt.izzysoft.de/fdroid/index/apk/devs.org.calculator"><img src="https://gitlab.com/IzzyOnDroid/repo/-/raw/master/assets/IzzyOnDroid.png" height="80"></a> <a href="https://www.androidfreeware.net/download-apk-devs-org-calculator.html"><img src="https://www.androidfreeware.net/images/androidfreeware-badge.png" height="80"></a> 
+
+</div>
+
+## 😍 Why Choose This App?  
+The **Calculator Hide File App** is an **open-source** application, allowing you to inspect the code yourself. This ensures **complete transparency** and guarantees that your **privacy remains uncompromised**. 🔒✅  
+
+
+---
+
+## 🔥 About Calculator Hide File App
+
+The **Calculator Hide File App** is an innovative **Android file-hiding app** that disguises itself as a **fully functional calculator**. It helps you **securely store** private files and protect them with a **hidden passcode**.
+
+> **⭐ Why Choose This App?**  
+> - Hide images, videos, documents & other files securely.  
+> - Works like a **real calculator** with hidden storage mode.  
+> - No one will suspect it’s a file vault!  
+> - **Encrypt** files with your **custom key** to secure your hidden files.
+---
+
+## 🚀 Features
+
+✅ **Dual Functionality** – A working **calculator** & a **file vault** in one app.  
+✅ **Secret Passcode** – Unlock hidden files by entering a secret code.  
+✅ **Secure File Manager** – Hide/Unhide files easily.  
+✅ **Fast & Lightweight** – Smooth performance on all Android devices.  
+✅ **No Root Required** – Works without rooting your phone.  
+✅ **Security** – Encrypt & Decrypt files.
+---
+
+## 🖼️ Screenshots
+
+<div align="center">
+  <img src="media/Screenshot_1.jpg" alt="Calculator Hide File App - Home Screen" width="32%">
+  <img src="media/Screenshot_2.jpg" alt="Calculator Hide File App - Secure File Storage" width="32%">
+  <img src="media/Screenshot_3.jpg" alt="Calculator Hide File App - Passcode Protection" width="32%">
+</div>
+
+<div align="center">
+  <img src="media/Screenshot_4.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
+  <img src="media/Screenshot_5.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
+    <img src="media/Screenshot_6.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
+</div>
+
+<div align="center">
+    <img src="media/Screenshot_7.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
+    <img src="media/Screenshot_8.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
+    <img src="media/Screenshot_9.jpg" alt="Calculator Hide File App - Hidden Files Manager" width="32%">
 </div>
 
 ---
-Welcome to the **Calculator Hide File App**! This app is a unique and secure way to hide your sensitive files under the disguise of a fully functional calculator.
+
+## 🔑 How It Works
+
+1. **Use as a Regular Calculator**  
+   - Perform standard arithmetic operations like a normal calculator.  
+
+2. **Enter Secret Passcode**  
+   - Type `123456` and press `=` to set up your password.  
+   - Enter your **custom passcode** and hit `=` to unlock the hidden file manager.  
+
+3. **Manage Hidden Files**  
+   - Add, remove, and restore hidden files.  
+   - Files stay protected even after closing the app.
+   - Create Hidden Folders.
+   - Move & Copy Hidden Files Between Hidden Folders.
 
 ---
 
-## Features
+## 📥 Download & Installation
 
-- **Dual Functionality**: Operates as a regular calculator and a file hiding app.
-- **User-Friendly Interface**: Simple and intuitive design for easy use.
-- **Secure File Storage**: Protects your hidden files with a passcode.
-- **Passcode Protection**: Access the hidden files by entering a secret passcode in the calculator.
-- **File Management**: Easily hide, unhide, and manage files within the app.
+### 🔗 **[Download the Latest Version Here](https://github.com/Binondi/Calculator-Hide-Files/releases/latest)**
+
+### 🔹 Prerequisites
+- **Android 6.0 or higher**  
+- **Storage permissions enabled**
+- **Need Manage All Files Permissons For Android 11 and Higher Versions.**
+
+### 🔹 Installation Steps
+```bash
+git clone https://github.com/Binondi/Calculator-Hide-Files.git
+```
+- Open **Android Studio** and build the project.  
+- Install the APK on your **Android device or emulator**.  
 
 ---
 
-## Screenshots
-<div>
-  
-  <img src="app/src/main/assets/Screenshot_1.jpg" alt="Screenshot 1" width="24%">
-  <img src="app/src/main/assets/Screenshot_2.jpg" alt="Screenshot 2" width="24%">
-  <img src="app/src/main/assets/Screenshot_3.jpg" alt="Screenshot 3" width="24%">
-  <img src="app/src/main/assets/Screenshot_4.jpg" alt="Screenshot 4" width="24%">
+## 🛠️ Technologies Used
 
-  </div>
-  <div>
-  <img src="app/src/main/assets/Screenshot_5.jpg" alt="Screenshot 5" width="24%">
-  <img src="app/src/main/assets/Screenshot_6.jpg" alt="Screenshot 6" width="24%">
-  <img src="app/src/main/assets/Screenshot_7.jpg" alt="Screenshot 7" width="24%">
-  <img src="app/src/main/assets/Screenshot_8.jpg" alt="Screenshot 8" width="24%">
-</div>
----
-
-## How It Works
-
-1. **Calculator Mode**:
-   - Perform basic arithmetic operations just like any regular calculator.
-2. **Setup Password**:
-   - Enter `123456=` to setup your password. 
-3. **Hidden Mode**:
-   - Enter your secret passcode and hit the `=` button to unlock the hidden file manager.
-5. **File Management**:
-   - Add files to hide them securely.
-   - Retrieve or unhide files as needed.
+- **Programming Language**: Kotlin
+- **UI Framework**: XML
+- **File Storage**: Secure internal storage & MediaStore API  
 
 ---
 
-## ☕ Support
+## 🎯 Why Use Calculator Hide File App?
 
-Support My development by donating money. Thank you very much for your help! ❤️
-
-[<img src="https://img.shields.io/badge/sponsor-30363D?style=for-the-badge&logo=GitHub-Sponsors&logoColor=#EA4AAA"
-alt="Sponsor the project on GitHub"
-height="40">](https://github.com/sponsors/Binondi/Calculator-Hide-Files) [<img src="https://img.shields.io/badge/PayPal-00457C?style=for-the-badge&logo=paypal&logoColor=white"
-alt="Donate with PayPal"
-height="40">](https://www.paypal.me/BinondiBorthakur56) [<img src="https://img.shields.io/badge/Buy%20Me%20a%20Coffee-ffdd00?style=for-the-badge&logo=buy-me-a-coffee&logoColor=black"
-alt="Donate with buymeacoffee"
-height="40">](https://buymeacoffee.com/binondi)
-
-
----
-## Installation
-
-### Prerequisites
-- Android Studio (for development)
-- A device or emulator running Android 6.0 or higher
-
-### Steps
-1. Clone the repository:
-   ```bash
-   git clone https://github.com/YourUsername/CalculatorHideFileApp.git
-   ```
-2. Open the project in Android Studio.
-3. Build and run the app on your device or emulator.
+- **No One Can Detect Your Files** – Works like a real calculator.  
+- **100% Secure** – Your private files stay hidden, even if someone opens the app.  
+- **Completely Free & Open Source** – Modify or contribute to the project.  
 
 ---
 
-## Technologies Used
+## ❤️ Support the Project
 
-- **Programming Language**: Java/Kotlin
-- **Development Platform**: Android Studio
-- **UI Framework**: Android XML layouts
-- **File Storage**: Secure internal storage and MediaStore API
+If you find this app useful, please consider supporting the development. 🙏  
 
+[![Sponsor on GitHub](https://img.shields.io/badge/sponsor-30363D?style=for-the-badge&logo=GitHub-Sponsors&logoColor=#EA4AAA)](https://github.com/sponsors/Binondi)
+[![Donate via PayPal](https://img.shields.io/badge/PayPal-00457C?style=for-the-badge&logo=paypal&logoColor=white)](https://paypal.me/BinondiBorthakur56)
+[![Buy Me a Coffee](https://img.shields.io/badge/Buy%20Me%20a%20Coffee-FFDD00?style=for-the-badge&logo=buy-me-a-coffee&logoColor=black)](https://buymeacoffee.com/binondi)
+
+- **UPI ID** 📱
+``
+binondi@naviaxis
+``
 ---
 
-## Usage Instructions
-
-1. Open the app.
-2. Use the calculator as normal.
-3. Enter the secret passcode and press `=` to switch to the hidden file manager.
-4. Add or manage your hidden files.
-
----
-
-## Contributing
+## 🔧 Contributing
 
 We welcome contributions! To contribute:
 
-1. Fork the repository.
-2. Create a new branch for your feature or bugfix:
+1. **Fork the repository**  
+2. **Create a new branch**  
    ```bash
    git checkout -b feature-name
    ```
-3. Commit your changes:
+3. **Commit your changes**  
    ```bash
    git commit -m "Add a new feature"
    ```
-4. Push to the branch:
+4. **Push to GitHub**  
    ```bash
    git push origin feature-name
    ```
-5. Open a Pull Request.
+5. **Create a Pull Request**  
 
 ---
 
-## License
+## 📜 License
 
-This project is licensed under the Apache License 2.0. See the [LICENSE](LICENSE) file for details.
+This project is licensed under the **Apache License 2.0**.  
+See the full license [here](LICENSE).  
 
 ---
 
-## Contact
+## 📧 Contact
 
-For any inquiries or feedback, reach out to:
-- **Email**: binondiborthakur56@gmail.com
-- **GitHub**: [Binondi](https://github.com/Binondi)
+For any questions or feedback:  
+📩 **Email**: binondiborthakur56@gmail.com  
+🐙 **GitHub**: [Binondi](https://github.com/Binondi)  
 
 ---
 
-Thank you for using the **Calculator Hide File App**! We hope you find it secure and easy to use.
+### 🎉 Thank You for Using Calculator Hide File App! 🎉  
+🚀 **Keep your files secure and hidden!** 🚀

app/build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
+    id("kotlin-kapt")
 }
 
 android {
@@ -10,22 +11,30 @@ android {
     defaultConfig {
         applicationId = "devs.org.calculator"
         minSdk = 26
+        //noinspection OldTargetApi
         targetSdk = 34
-        versionCode = 1
-        versionName = "1.0"
+        versionCode = 7
+        versionName = "1.4.2"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
         release {
-            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+        debug {
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro"
             )
         }
     }
+
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
@@ -36,6 +45,21 @@ android {
     buildFeatures{
         viewBinding = true
     }
+
+    packaging {
+        resources {
+            excludes += listOf(
+                "META-INF/DEPENDENCIES",
+                "META-INF/LICENSE",
+                "META-INF/LICENSE.txt",
+                "META-INF/license.txt",
+                "META-INF/NOTICE",
+                "META-INF/NOTICE.txt",
+                "META-INF/notice.txt",
+                "META-INF/ASL2.0"
+            )
+        }
+    }
 }
 
 dependencies {
@@ -45,15 +69,24 @@ dependencies {
     implementation(libs.material)
     implementation(libs.androidx.activity)
     implementation(libs.androidx.constraintlayout)
+    implementation(libs.androidx.gridlayout)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
 
     //custom dependencies
     implementation(libs.exp4j)
-    implementation("com.github.bumptech.glide:glide:4.16.0")
-    implementation("androidx.documentfile:documentfile:1.0.1")
-    implementation("com.github.chrisbanes:PhotoView:2.3.0")
-    implementation("androidx.viewpager:viewpager:1.0.0")
-    implementation("com.jsibbold:zoomage:1.3.1")
+    implementation(libs.glide)
+    implementation(libs.androidx.documentfile)
+    implementation(libs.photoview)
+    implementation(libs.androidx.viewpager)
+    implementation(libs.zoomage)
+    implementation(libs.lottie)
+    implementation(libs.androidx.swiperefreshlayout)
+
+    // Room dependencies
+    implementation(libs.androidx.room.runtime)
+    implementation(libs.androidx.room.ktx)
+    //noinspection KaptUsageInsteadOfKsp
+    kapt(libs.androidx.room.compiler)
 }

app/proguard-rules.pro

@@ -1,21 +1,70 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
+# Keep your MainActivity and Application class
+-keep public class devs.org.calculator.activities.MainActivity
+-keep public class devs.org.calculator.activities.SetupPasswordActivity
+-keep public class devs.org.calculator.activities.HiddenVaultActivity
+-keep public class devs.org.calculator.** { *; }
 
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
+# Keep exp4j library since it's used for expression evaluation
+-keep class net.objecthunter.exp4j.** { *; }
+-dontwarn net.objecthunter.exp4j.**
 
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
+# Keep Google Material components
+-keep class com.google.android.material.** { *; }
+-dontwarn com.google.android.material.**
 
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+# Keep Android X components
+-keep class androidx.** { *; }
+-keep interface androidx.** { *; }
+
+# Keep any classes with ViewBinding
+-keep class devs.org.calculator.databinding.** { *; }
+
+# Keep any callback interfaces
+-keep class devs.org.calculator.callbacks.** { *; }
+-keep interface devs.org.calculator.callbacks.** { *; }
+
+# Keep classes used for regex pattern matching
+-keep class java.util.regex.** { *; }
+
+# Keep annotation classes
+-keepattributes *Annotation*
+-keepattributes Signature
+-keepattributes SourceFile,LineNumberTable
+
+# Keep Parcelable classes (might be needed for Intent extras)
+-keep class * implements android.os.Parcelable {
+  public static final android.os.Parcelable$Creator *;
+}
+
+# Keep FileManager classes since they work with storage permissions
+-keep class devs.org.calculator.utils.FileManager { *; }
+
+# Keep DialogUtil since it's used for permission dialogs
+-keep class devs.org.calculator.utils.DialogUtil { *; }
+
+# Keep PrefsUtil since it's used for password validation
+-keep class devs.org.calculator.utils.PrefsUtil { *; }
+
+# General Android rules
+-keepclassmembers class * extends android.app.Activity {
+   public void *(android.view.View);
+}
+
+# Keep any classes that use reflection
+-keepattributes InnerClasses
+
+# Keep R classes and their fields
+-keepclassmembers class **.R$* {
+    public static <fields>;
+}
+
+# Keep enums
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}
+
+# Keep specific activities with special code in onCreate
+-keepclassmembers class * extends android.app.Activity {
+    public void onCreate(android.os.Bundle);
+}

app/release/output-metadata.json

@@ -0,0 +1,37 @@
+{
+  "version": 3,
+  "artifactType": {
+    "type": "APK",
+    "kind": "Directory"
+  },
+  "applicationId": "devs.org.calculator",
+  "variantName": "release",
+  "elements": [
+    {
+      "type": "SINGLE",
+      "filters": [],
+      "attributes": [],
+      "versionCode": 6,
+      "versionName": "1.4.1",
+      "outputFile": "app-release.apk"
+    }
+  ],
+  "elementType": "File",
+  "baselineProfiles": [
+    {
+      "minApi": 28,
+      "maxApi": 30,
+      "baselineProfiles": [
+        "baselineProfiles/1/app-release.dm"
+      ]
+    },
+    {
+      "minApi": 31,
+      "maxApi": 2147483647,
+      "baselineProfiles": [
+        "baselineProfiles/0/app-release.dm"
+      ]
+    }
+  ],
+  "minSdkVersionForDexing": 26
+}

app/src/main/AndroidManifest.xml

@@ -1,68 +1,65 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="devs.org.calculator"
-    >
+    package="devs.org.calculator">
 
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
+    <uses-permission
+        android:name="android.permission.READ_EXTERNAL_STORAGE"
         android:maxSdkVersion="32" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
         android:maxSdkVersion="29" />
-    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES"
+    <uses-permission
+        android:name="android.permission.READ_MEDIA_IMAGES"
         tools:ignore="SelectedPhotoAccess" />
-    <uses-permission android:name="android.permission.READ_MEDIA_VIDEO"
+    <uses-permission
+        android:name="android.permission.READ_MEDIA_VIDEO"
         tools:ignore="SelectedPhotoAccess" />
     <uses-permission android:name="android.permission.READ_MEDIA_AUDIO" />
-    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
+    <uses-permission
+        android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
         tools:ignore="ScopedStorage" />
 
     <application
         android:name=".CalculatorApp"
         android:allowBackup="true"
-        android:requestLegacyExternalStorage="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:requestLegacyExternalStorage="true"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Calculator"
         tools:targetApi="31">
         <activity
-            android:name=".activities.DocumentsActivity"
+            android:name=".activities.ViewFolderActivity"
             android:exported="false" />
         <activity
-            android:name=".activities.AudioGalleryActivity"
+            android:name=".activities.SettingsActivity"
             android:exported="false" />
         <activity
-            android:name=".activities.VideoGalleryActivity"
-            android:exported="false" />
-        <activity
-            android:name=".activities.ImageGalleryActivity"
+            android:name=".activities.HiddenActivity"
             android:exported="false" />
         <activity
             android:name=".activities.SetupPasswordActivity"
             android:exported="false" />
-
         <activity
             android:name=".activities.MainActivity"
-            android:exported="true" >
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity
-            android:name=".activities.HiddenVaultActivity"
-            android:exported="true" />
         <activity
             android:name=".activities.PreviewActivity"
-            android:configChanges="orientation|screenSize"/>
+            android:configChanges="orientation|screenSize" />
 
         <provider
             android:name="androidx.core.content.FileProvider"
-            android:authorities="devs.org.calculator.fileprovider"
+            android:authorities="devs.org.calculator.provider"
             android:exported="false"
             android:grantUriPermissions="true">
             <meta-data
@@ -70,8 +67,9 @@
                 android:resource="@xml/file_paths" />
         </provider>
 
-
+        <meta-data
+            android:name="android.app.icon"
+            android:resource="@mipmap/ic_launcher_monochrome" />
     </application>
 
-
 </manifest>

app/src/main/java/devs/org/calculator/CalculatorApp.kt

@@ -1,12 +1,18 @@
 package devs.org.calculator
 
 import android.app.Application
+import androidx.appcompat.app.AppCompatDelegate
 import com.google.android.material.color.DynamicColors
+import devs.org.calculator.utils.PrefsUtil
 
 class CalculatorApp : Application() {
     override fun onCreate() {
         super.onCreate()
-        // Apply dynamic colors to enable Material You theming
-        DynamicColors.applyToActivitiesIfAvailable(this)
+        val prefs = PrefsUtil(this)
+        val themeMode = prefs.getInt("theme_mode", AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+        AppCompatDelegate.setDefaultNightMode(themeMode)
+        if (prefs.getBoolean("dynamic_theme", true)) {
+            DynamicColors.applyToActivitiesIfAvailable(this)
+        }
     }
 } 

app/src/main/java/devs/org/calculator/activities/AudioGalleryActivity.kt

@@ -1,85 +0,0 @@
-package devs.org.calculator.activities
-
-import android.content.Intent
-import android.net.Uri
-import android.os.Bundle
-import android.widget.Toast
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.callbacks.FileProcessCallback
-import devs.org.calculator.utils.FileManager
-import kotlinx.coroutines.launch
-import java.io.File
-
-class AudioGalleryActivity : BaseGalleryActivity(), FileProcessCallback {
-    override val fileType = FileManager.FileType.AUDIO
-    private lateinit var pickAudioLauncher: ActivityResultLauncher<Intent>
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setupFabButton()
-
-        pickAudioLauncher =
-            registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-                if (result.resultCode == RESULT_OK) {
-                    val clipData = result.data?.clipData
-                    val uriList = mutableListOf<Uri>()
-
-                    if (clipData != null) {
-                        for (i in 0 until clipData.itemCount) {
-                            val uri = clipData.getItemAt(i).uri
-                            uriList.add(uri)
-                        }
-                    } else {
-                        result.data?.data?.let { uriList.add(it) }
-                    }
-
-                    if (uriList.isNotEmpty()) {
-                        lifecycleScope.launch {
-                            FileManager(
-                                this@AudioGalleryActivity,
-                                this@AudioGalleryActivity
-                            ).processMultipleFiles(uriList, fileType, this@AudioGalleryActivity)
-                        }
-                    } else {
-                        Toast.makeText(this, "No files selected", Toast.LENGTH_SHORT).show()
-                    }
-                }
-            }
-    }
-
-    override fun onFilesProcessedSuccessfully(copiedFiles: List<File>) {
-        Toast.makeText(
-            this@AudioGalleryActivity,
-            "${copiedFiles.size} Audios hidden successfully",
-            Toast.LENGTH_SHORT
-        ).show()
-        loadFiles()
-    }
-
-    override fun onFileProcessFailed() {
-        Toast.makeText(this@AudioGalleryActivity, "Failed to hide Audios", Toast.LENGTH_SHORT)
-            .show()
-    }
-
-    private fun setupFabButton() {
-        binding.fabAdd.setOnClickListener {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
-                type = "audio/*"
-                addCategory(Intent.CATEGORY_OPENABLE)
-                putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
-                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
-            }
-            pickAudioLauncher.launch(intent)
-        }
-    }
-
-    override fun openPreview() {
-        // Implement audio preview
-    }
-
-
-}

app/src/main/java/devs/org/calculator/activities/BaseGalleryActivity.kt

@@ -1,139 +0,0 @@
-package devs.org.calculator.activities
-
-import android.Manifest
-import android.content.Intent
-import android.content.pm.PackageManager
-import android.net.Uri
-import android.os.Build
-import android.os.Bundle
-import android.os.Environment
-import android.provider.Settings
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.IntentSenderRequest
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.appcompat.app.AppCompatActivity
-import androidx.recyclerview.widget.GridLayoutManager
-import devs.org.calculator.adapters.FileAdapter
-import devs.org.calculator.databinding.ActivityGalleryBinding
-import devs.org.calculator.utils.FileManager
-import java.io.File
-
-abstract class BaseGalleryActivity : AppCompatActivity() {
-    protected lateinit var binding: ActivityGalleryBinding
-    protected lateinit var fileManager: FileManager
-    protected lateinit var adapter: FileAdapter
-    protected lateinit var files: List<File>
-
-    private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
-    private val storagePermissionLauncher = registerForActivityResult(
-        ActivityResultContracts.RequestMultiplePermissions()
-    ) { permissions ->
-        val granted = permissions.values.all { it }
-        if (granted || Build.VERSION.SDK_INT >= Build.VERSION_CODES.R && Environment.isExternalStorageManager()) {
-            loadFiles()
-        } else {
-            showPermissionDeniedDialog()
-        }
-    }
-
-    abstract val fileType: FileManager.FileType
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setupIntentSenderLauncher()
-        binding = ActivityGalleryBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-
-        fileManager = FileManager(this, this)
-
-        binding.fabAdd.text = when(fileType){
-            FileManager.FileType.IMAGE -> {
-                 "Add Image"
-            }
-            FileManager.FileType.AUDIO -> {
-                "Add Audio"
-            }
-            FileManager.FileType.VIDEO -> {
-                "Add Video"
-            }
-            FileManager.FileType.DOCUMENT -> {
-                "Add Files"
-            }
-        }
-        binding.recyclerView.setOnScrollChangeListener { _, _, scrollY, _, oldScrollY ->
-            if (scrollY > oldScrollY && binding.fabAdd.isExtended) {
-
-                binding.fabAdd.shrink()
-            } else if (scrollY < oldScrollY && !binding.fabAdd.isExtended) {
-
-                binding.fabAdd.extend()
-            }
-        }
-        setupRecyclerView()
-        checkPermissionsAndLoadFiles()
-    }
-
-    private fun setupIntentSenderLauncher() {
-        intentSenderLauncher = registerForActivityResult(
-            ActivityResultContracts.StartIntentSenderForResult()
-        ) { result ->
-            if (result.resultCode == RESULT_OK) {
-                loadFiles()
-            }
-        }
-    }
-
-    private fun setupRecyclerView() {
-        binding.recyclerView.layoutManager = GridLayoutManager(this, 3)
-        adapter = FileAdapter(fileType, this, this)
-        binding.recyclerView.adapter = adapter
-    }
-
-    private fun checkPermissionsAndLoadFiles() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            if (!Environment.isExternalStorageManager()) {
-                val intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION)
-                    .addCategory("android.intent.category.DEFAULT")
-                    .setData(Uri.parse("package:${applicationContext.packageName}"))
-                startActivityForResult(intent, 2296)
-            } else {
-                loadFiles()
-            }
-        } else {
-            val permissions = arrayOf(
-                Manifest.permission.READ_EXTERNAL_STORAGE,
-                Manifest.permission.WRITE_EXTERNAL_STORAGE
-            )
-            if (permissions.any { checkSelfPermission(it) != PackageManager.PERMISSION_GRANTED }) {
-                storagePermissionLauncher.launch(permissions)
-            } else {
-                loadFiles()
-            }
-        }
-    }
-
-    protected open fun loadFiles() {
-        files = fileManager.getFilesInHiddenDir(fileType)
-        adapter.submitList(files)
-    }
-
-    override fun onResume() {
-        super.onResume()
-        loadFiles()
-    }
-
-    abstract fun openPreview()
-
-    private fun showPermissionDeniedDialog() {
-        // permission denied
-    }
-
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        if (requestCode == 2296 && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            if (Environment.isExternalStorageManager()) {
-                loadFiles()
-            }
-        }
-    }
-}

app/src/main/java/devs/org/calculator/activities/DocumentsActivity.kt

@@ -1,75 +0,0 @@
-package devs.org.calculator.activities
-
-import android.content.Intent
-import android.net.Uri
-import android.os.Bundle
-import android.widget.Toast
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.utils.FileManager
-import devs.org.calculator.callbacks.FileProcessCallback
-import kotlinx.coroutines.launch
-import java.io.File
-
-class DocumentsActivity : BaseGalleryActivity(), FileProcessCallback {
-    override val fileType = FileManager.FileType.DOCUMENT
-    private lateinit var pickLauncher: ActivityResultLauncher<Intent>
-    private var selectedUri: Uri? = null
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setupFabButton()
-
-        pickLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-            if (result.resultCode == RESULT_OK) {
-                val clipData = result.data?.clipData
-                val uriList = mutableListOf<Uri>()
-
-                if (clipData != null) {
-                    for (i in 0 until clipData.itemCount) {
-                        val uri = clipData.getItemAt(i).uri
-                        uriList.add(uri)
-                    }
-                } else {
-                    result.data?.data?.let { uriList.add(it) } // Single file selected
-                }
-
-                if (uriList.isNotEmpty()) {
-                    lifecycleScope.launch {
-                        FileManager(this@DocumentsActivity, this@DocumentsActivity).processMultipleFiles(uriList, fileType,this@DocumentsActivity )
-                    }
-                } else {
-                    Toast.makeText(this, "No files selected", Toast.LENGTH_SHORT).show()
-                }
-            }
-        }
-    }
-
-    override fun onFilesProcessedSuccessfully(copiedFiles: List<File>) {
-        Toast.makeText(this@DocumentsActivity, "${copiedFiles.size} Documents hidden successfully", Toast.LENGTH_SHORT).show()
-        loadFiles()
-    }
-
-    override fun onFileProcessFailed() {
-        Toast.makeText(this@DocumentsActivity, "Failed to hide Documents", Toast.LENGTH_SHORT).show()
-    }
-
-    private fun setupFabButton() {
-        binding.fabAdd.setOnClickListener {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
-                type = "*/*"
-                addCategory(Intent.CATEGORY_OPENABLE)
-                putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
-                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
-            }
-            pickLauncher.launch(intent)
-        }
-    }
-
-    override fun openPreview() {
-        // Implement document preview
-    }
-}

app/src/main/java/devs/org/calculator/activities/HiddenActivity.kt

@@ -0,0 +1,509 @@
+package devs.org.calculator.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.os.Environment
+import android.os.Handler
+import android.os.Looper
+import android.view.LayoutInflater
+import android.view.View
+import android.view.WindowManager
+import android.widget.EditText
+import android.widget.Toast
+import androidx.activity.OnBackPressedCallback
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.recyclerview.widget.GridLayoutManager
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import devs.org.calculator.R
+import devs.org.calculator.adapters.FolderAdapter
+import devs.org.calculator.adapters.ListFolderAdapter
+import devs.org.calculator.databinding.ActivityHiddenBinding
+import devs.org.calculator.utils.DialogUtil
+import devs.org.calculator.utils.FileManager
+import devs.org.calculator.utils.FileManager.Companion.HIDDEN_DIR
+import devs.org.calculator.utils.FolderManager
+import devs.org.calculator.utils.PrefsUtil
+import java.io.File
+
+class HiddenActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivityHiddenBinding
+    private lateinit var fileManager: FileManager
+    private lateinit var folderManager: FolderManager
+    private lateinit var dialogUtil: DialogUtil
+    private var currentFolder: File? = null
+    private var folderAdapter: FolderAdapter? = null
+    private var listFolderAdapter: ListFolderAdapter? = null
+    private val hiddenDir = File(Environment.getExternalStorageDirectory(), HIDDEN_DIR)
+    private val prefs:PrefsUtil by lazy { PrefsUtil(this) }
+
+    private val mainHandler = Handler(Looper.getMainLooper())
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityHiddenBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        fileManager = FileManager(this, this)
+        folderManager = FolderManager()
+        dialogUtil = DialogUtil(this)
+        enableEdgeToEdge()
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+
+        setupInitialUIState()
+        setupClickListeners()
+        setupBackPressedHandler()
+
+        fileManager.askPermission(this)
+
+        refreshCurrentView()
+    }
+
+    private fun setupInitialUIState() {
+
+        binding.addFolder.visibility = View.VISIBLE
+        binding.settings.visibility = View.VISIBLE
+        binding.folderOrientation.visibility = View.VISIBLE
+        binding.deleteSelected.visibility = View.GONE
+        binding.delete.visibility = View.GONE
+        binding.menuButton.visibility = View.GONE
+    }
+
+    private fun setupClickListeners() {
+
+
+        binding.settings.setOnClickListener {
+            startActivity(Intent(this, SettingsActivity::class.java))
+        }
+
+
+        binding.back.setOnClickListener {
+            handleBackPress()
+        }
+
+        binding.addFolder.setOnClickListener {
+            createNewFolder()
+        }
+
+        binding.deleteSelected.setOnClickListener {
+            deleteSelectedItems()
+        }
+
+        binding.delete.setOnClickListener {
+            deleteSelectedItems()
+        }
+
+        binding.edit.setOnClickListener {
+            editSelectedFolder()
+        }
+
+        binding.folderOrientation.setOnClickListener {
+            val currentIsList = PrefsUtil(this).getBoolean("isList", false)
+            val newIsList = !currentIsList
+
+            if (newIsList) {
+                showListUI()
+                PrefsUtil(this).setBoolean("isList", true)
+                binding.folderOrientation.setIconResource(R.drawable.ic_grid)
+            } else {
+                showGridUI()
+                PrefsUtil(this).setBoolean("isList", false)
+                binding.folderOrientation.setIconResource(R.drawable.ic_list)
+            }
+        }
+    }
+
+    private fun showGridUI() {
+        listFoldersInHiddenDirectory()
+    }
+
+    private fun showListUI() {
+        listFoldersInHiddenDirectoryListStyle()
+    }
+
+    private fun listFoldersInHiddenDirectoryListStyle() {
+        try {
+            if (!hiddenDir.exists()) {
+                fileManager.getHiddenDirectory()
+            }
+
+            if (hiddenDir.exists() && hiddenDir.isDirectory) {
+                val folders = folderManager.getFoldersInDirectory(hiddenDir)
+
+                if (folders.isNotEmpty()) {
+                    showFolderListStyle(folders)
+                } else {
+                    showEmptyState()
+                }
+            } else {
+                showEmptyState()
+            }
+        } catch (_: Exception) {
+
+            showEmptyState()
+        }
+    }
+
+    private fun setupBackPressedHandler() {
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                handleBackPress()
+            }
+        })
+    }
+
+
+    private fun createNewFolder() {
+        val dialogView = LayoutInflater.from(this).inflate(R.layout.dialog_input, null)
+        val inputEditText = dialogView.findViewById<EditText>(R.id.editText)
+
+        MaterialAlertDialogBuilder(this)
+            .setTitle(getString(R.string.enter_folder_name_to_create))
+            .setView(dialogView)
+            .setPositiveButton(getString(R.string.create)) { dialog, _ ->
+                val newName = inputEditText.text.toString().trim()
+                if (newName.isNotEmpty()) {
+                    try {
+                        folderManager.createFolder(hiddenDir, newName)
+                        refreshCurrentView()
+                    } catch (_: Exception) {
+                        Toast.makeText(
+                            this@HiddenActivity,
+                            getString(R.string.failed_to_create_folder),
+                            Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                }
+                dialog.dismiss()
+            }
+            .setNegativeButton(getString(R.string.cancel)) { dialog, _ ->
+                dialog.cancel()
+            }
+            .show()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        setupFlagSecure()
+    }
+
+    private fun setupFlagSecure() {
+        if (prefs.getBoolean("screenshot_restriction", true)) {
+            window.setFlags(
+                WindowManager.LayoutParams.FLAG_SECURE,
+                WindowManager.LayoutParams.FLAG_SECURE
+            )
+        }
+    }
+
+
+    private fun listFoldersInHiddenDirectory() {
+        try {
+            if (!hiddenDir.exists()) {
+                fileManager.getHiddenDirectory()
+            }
+
+            if (hiddenDir.exists() && hiddenDir.isDirectory) {
+                val folders = folderManager.getFoldersInDirectory(hiddenDir)
+
+                if (folders.isNotEmpty()) {
+                    showFolderList(folders)
+                } else {
+                    showEmptyState()
+                }
+            } else {
+                showEmptyState()
+            }
+        } catch (_: Exception) {
+            showEmptyState()
+        }
+    }
+
+    private fun showFolderList(folders: List<File>) {
+        binding.noItems.visibility = View.GONE
+        binding.recyclerView.visibility = View.VISIBLE
+        listFolderAdapter = null
+
+        binding.recyclerView.layoutManager = GridLayoutManager(this, 2)
+        folderAdapter = FolderAdapter(
+            onFolderClick = { clickedFolder ->
+                startActivity(Intent(this,ViewFolderActivity::class.java).putExtra("folder",clickedFolder.toString()))
+            },
+            onFolderLongClick = {
+                enterFolderSelectionMode()
+            },
+            onSelectionModeChanged = { isSelectionMode ->
+                handleFolderSelectionModeChange(isSelectionMode)
+            },
+            onSelectionCountChanged = { _ ->
+                updateEditButtonVisibility()
+            }
+        )
+        binding.recyclerView.adapter = folderAdapter
+        folderAdapter?.submitList(folders)
+
+        if (folderAdapter?.isInSelectionMode() != true) {
+            showFolderViewIcons()
+        }
+    }
+    private fun showFolderListStyle(folders: List<File>) {
+        binding.noItems.visibility = View.GONE
+        binding.recyclerView.visibility = View.VISIBLE
+        folderAdapter = null
+
+        binding.recyclerView.layoutManager = GridLayoutManager(this, 1)
+        listFolderAdapter = ListFolderAdapter(
+            onFolderClick = { clickedFolder ->
+                startActivity(Intent(this,ViewFolderActivity::class.java).putExtra("folder",clickedFolder.toString()))
+            },
+            onFolderLongClick = {
+                enterFolderSelectionMode()
+            },
+            onSelectionModeChanged = { isSelectionMode ->
+                handleFolderSelectionModeChange(isSelectionMode)
+            },
+            onSelectionCountChanged = { _ ->
+                updateEditButtonVisibility()
+            }
+        )
+        binding.recyclerView.adapter = listFolderAdapter
+        listFolderAdapter?.submitList(folders)
+
+        if (listFolderAdapter?.isInSelectionMode() != true) {
+            showFolderViewIcons()
+        }
+    }
+
+    private fun updateEditButtonVisibility() {
+        val selectedCount = when {
+            folderAdapter != null -> folderAdapter?.getSelectedItems()?.size ?: 0
+            listFolderAdapter != null -> listFolderAdapter?.getSelectedItems()?.size ?: 0
+            else -> 0
+        }
+        binding.edit.visibility = if (selectedCount == 1) View.VISIBLE else View.GONE
+    }
+
+    private fun showEmptyState() {
+        binding.noItems.visibility = View.VISIBLE
+        binding.recyclerView.visibility = View.GONE
+    }
+
+    private fun enterFolderSelectionMode() {
+        showFolderSelectionIcons()
+    }
+
+
+    private fun refreshCurrentView() {
+        val isList = PrefsUtil(this).getBoolean("isList", false)
+        if (isList) {
+            binding.folderOrientation.setIconResource(R.drawable.ic_grid)
+            listFoldersInHiddenDirectoryListStyle()
+        } else {
+            binding.folderOrientation.setIconResource(R.drawable.ic_list)
+            listFoldersInHiddenDirectory()
+        }
+    }
+
+
+    private fun deleteSelectedItems() {
+        deleteSelectedFolders()
+    }
+
+    private fun deleteSelectedFolders() {
+        val selectedFolders = when {
+            folderAdapter != null -> folderAdapter?.getSelectedItems() ?: emptyList()
+            listFolderAdapter != null -> listFolderAdapter?.getSelectedItems() ?: emptyList()
+            else -> emptyList()
+        }
+
+        if (selectedFolders.isNotEmpty()) {
+            dialogUtil.showMaterialDialog(
+                getString(R.string.delete_items),
+               "${getString(R.string.are_you_sure_you_want_to_delete_selected_items)}\n ${getString(R.string.folder_will_be_deleted_permanently)}" ,
+                getString(R.string.delete),
+                getString(R.string.cancel),
+                object : DialogUtil.DialogCallback {
+                    override fun onPositiveButtonClicked() {
+                        performFolderDeletion(selectedFolders)
+                    }
+
+                    override fun onNegativeButtonClicked() {
+
+                    }
+
+                    override fun onNaturalButtonClicked() {
+
+                    }
+                }
+            )
+        }
+    }
+
+    private fun performFolderDeletion(selectedFolders: List<File>) {
+        var allDeleted = true
+        selectedFolders.forEach { folder ->
+            if (!folderManager.deleteFolder(folder)) {
+                allDeleted = false
+            }
+        }
+
+        val message = if (allDeleted) {
+            getString(R.string.folder_deleted_successfully)
+        } else {
+            getString(R.string.some_items_could_not_be_deleted)
+        }
+
+        Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
+
+        folderAdapter?.clearSelection()
+        listFolderAdapter?.clearSelection()
+
+        exitFolderSelectionMode()
+
+        refreshCurrentView()
+    }
+
+    private fun handleBackPress() {
+
+        if (folderAdapter?.onBackPressed() == true || listFolderAdapter?.onBackPressed() == true) {
+            return
+        }
+
+        if (currentFolder != null) {
+            navigateBackToFolders()
+        } else {
+            finish()
+        }
+    }
+
+    private fun navigateBackToFolders() {
+        currentFolder = null
+
+        refreshCurrentView()
+
+        binding.folderName.text = getString(R.string.hidden_space)
+
+        showFolderViewIcons()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        mainHandler.removeCallbacksAndMessages(null)
+    }
+
+    private fun showFolderViewIcons() {
+        binding.folderOrientation.visibility = View.VISIBLE
+        binding.settings.visibility = View.VISIBLE
+        binding.delete.visibility = View.GONE
+        binding.deleteSelected.visibility = View.GONE
+        binding.menuButton.visibility = View.GONE
+        binding.addFolder.visibility = View.VISIBLE
+        binding.edit.visibility = View.GONE
+        if (currentFolder == null) {
+
+            binding.addFolder.visibility = View.VISIBLE
+        }
+    }
+    private fun showFolderSelectionIcons() {
+        binding.folderOrientation.visibility = View.GONE
+        binding.settings.visibility = View.GONE
+        binding.delete.visibility = View.VISIBLE
+        binding.deleteSelected.visibility = View.VISIBLE
+        binding.menuButton.visibility = View.GONE
+        binding.addFolder.visibility = View.GONE
+        updateEditButtonVisibility()
+    }
+    private fun exitFolderSelectionMode() {
+        showFolderViewIcons()
+    }
+
+    private fun handleFolderSelectionModeChange(isSelectionMode: Boolean) {
+        if (!isSelectionMode) {
+            exitFolderSelectionMode()
+        } else {
+            enterFolderSelectionMode()
+        }
+        updateEditButtonVisibility()
+    }
+
+    private fun editSelectedFolder() {
+        val selectedFolders = when {
+            folderAdapter != null -> folderAdapter?.getSelectedItems() ?: emptyList()
+            listFolderAdapter != null -> listFolderAdapter?.getSelectedItems() ?: emptyList()
+            else -> emptyList()
+        }
+
+        if (selectedFolders.size != 1) {
+            Toast.makeText(this,
+                getString(R.string.please_select_exactly_one_folder_to_edit), Toast.LENGTH_SHORT).show()
+            return
+        }
+
+        val folder = selectedFolders[0]
+        showEditFolderDialog(folder)
+    }
+
+    private fun showEditFolderDialog(folder: File) {
+        val dialogView = LayoutInflater.from(this).inflate(R.layout.dialog_input, null)
+        val inputEditText = dialogView.findViewById<EditText>(R.id.editText)
+        inputEditText.setText(folder.name)
+        inputEditText.selectAll()
+
+        MaterialAlertDialogBuilder(this)
+            .setTitle(getString(R.string.rename_folder))
+            .setView(dialogView)
+            .setPositiveButton(getString(R.string.rename)) { dialog, _ ->
+                val newName = inputEditText.text.toString().trim()
+                if (newName.isNotEmpty() && newName != folder.name) {
+                    if (isValidFolderName(newName)) {
+                        renameFolder(folder, newName)
+                    } else {
+                        Toast.makeText(this,
+                            getString(R.string.invalid_folder_name), Toast.LENGTH_SHORT).show()
+                    }
+                }
+                dialog.dismiss()
+            }
+            .setNegativeButton(getString(R.string.cancel)) { dialog, _ ->
+                dialog.cancel()
+            }
+            .show()
+    }
+
+    private fun isValidFolderName(folderName: String): Boolean {
+        val forbiddenChars = charArrayOf('/', '\\', ':', '*', '?', '"', '<', '>', '|')
+        return folderName.isNotBlank() &&
+                folderName.none { it in forbiddenChars } &&
+                !folderName.startsWith(".") &&
+                folderName.length <= 255
+    }
+
+    private fun renameFolder(oldFolder: File, newName: String) {
+        val parentDir = oldFolder.parentFile
+        if (parentDir != null) {
+            val newFolder = File(parentDir, newName)
+            if (newFolder.exists()) {
+                Toast.makeText(this,
+                    getString(R.string.folder_with_this_name_already_exists), Toast.LENGTH_SHORT).show()
+                return
+            }
+
+            if (oldFolder.renameTo(newFolder)) {
+                folderAdapter?.clearSelection()
+                listFolderAdapter?.clearSelection()
+                exitFolderSelectionMode()
+
+                refreshCurrentView()
+            } else {
+                Toast.makeText(this, getString(R.string.failed_to_rename_folder), Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+}

app/src/main/java/devs/org/calculator/activities/HiddenVaultActivity.kt

@@ -1,36 +0,0 @@
-package devs.org.calculator.activities
-
-import android.content.Intent
-import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
-import devs.org.calculator.databinding.ActivityHiddenVaultBinding
-import devs.org.calculator.utils.FileManager
-
-class HiddenVaultActivity : AppCompatActivity() {
-    private lateinit var binding: ActivityHiddenVaultBinding
-    private lateinit var fileManager: FileManager
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        binding = ActivityHiddenVaultBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-
-        fileManager = FileManager(this, this)
-        setupNavigation()
-    }
-
-    private fun setupNavigation() {
-        binding.btnImages.setOnClickListener {
-            startActivity(Intent(this, ImageGalleryActivity::class.java))
-        }
-        binding.btnVideos.setOnClickListener {
-            startActivity(Intent(this, VideoGalleryActivity::class.java))
-        }
-        binding.btnAudio.setOnClickListener {
-            startActivity(Intent(this, AudioGalleryActivity::class.java))
-        }
-        binding.btnDocs.setOnClickListener {
-            startActivity(Intent(this, DocumentsActivity::class.java))
-        }
-    }
-}

app/src/main/java/devs/org/calculator/activities/ImageGalleryActivity.kt

@@ -1,155 +0,0 @@
-package devs.org.calculator.activities
-
-import android.content.Intent
-import android.content.pm.PackageManager
-import android.net.Uri
-import android.os.Build
-import android.os.Bundle
-import android.os.Environment
-import android.provider.Settings
-import android.widget.Toast
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.IntentSenderRequest
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.core.app.ActivityCompat
-import androidx.core.content.ContextCompat
-import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.utils.FileManager
-import kotlinx.coroutines.launch
-import java.io.File
-import android.Manifest
-import devs.org.calculator.callbacks.FileProcessCallback
-
-class ImageGalleryActivity : BaseGalleryActivity(), FileProcessCallback  {
-    override val fileType = FileManager.FileType.IMAGE
-    private val STORAGE_PERMISSION_CODE = 100
-
-    private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
-    private lateinit var pickImageLauncher: ActivityResultLauncher<Intent>
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setupIntentSenderLauncher()
-        setupFabButton()
-
-        intentSenderLauncher = registerForActivityResult(ActivityResultContracts.StartIntentSenderForResult()){
-            if (it.resultCode != RESULT_OK) Toast.makeText(this, "Failed to hide/unhide photo", Toast.LENGTH_SHORT).show()
-        }
-
-        pickImageLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-            if (result.resultCode == RESULT_OK) {
-                val clipData = result.data?.clipData
-                val uriList = mutableListOf<Uri>()
-
-                if (clipData != null) {
-                    for (i in 0 until clipData.itemCount) {
-                        val uri = clipData.getItemAt(i).uri
-                        uriList.add(uri)
-                    }
-                } else {
-                    result.data?.data?.let { uriList.add(it) }
-                }
-
-                if (uriList.isNotEmpty()) {
-                    lifecycleScope.launch {
-                        FileManager(this@ImageGalleryActivity, this@ImageGalleryActivity)
-                            .processMultipleFiles(uriList, fileType,this@ImageGalleryActivity )
-                    }
-                } else {
-                    Toast.makeText(this, "No files selected", Toast.LENGTH_SHORT).show()
-                }
-            }
-        }
-        askPermissiom()
-    }
-
-    override fun onFilesProcessedSuccessfully(copiedFiles: List<File>) {
-        Toast.makeText(this@ImageGalleryActivity, "${copiedFiles.size} Images hidden successfully", Toast.LENGTH_SHORT).show()
-        loadFiles()
-    }
-
-    override fun onFileProcessFailed() {
-        Toast.makeText(this@ImageGalleryActivity, "Failed to hide images", Toast.LENGTH_SHORT).show()
-    }
-
-    private fun setupIntentSenderLauncher() {
-        intentSenderLauncher = registerForActivityResult(
-            ActivityResultContracts.StartIntentSenderForResult()
-        ) { result ->
-            if (result.resultCode == RESULT_OK) {
-                loadFiles()
-            }
-        }
-    }
-
-    private fun askPermissiom() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
-            if (!Environment.isExternalStorageManager()){
-                val intent = Intent().setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION)
-                startActivity(intent)
-            }
-        }
-        else {
-            checkAndRequestStoragePermission()
-        }
-    }
-
-    private fun checkAndRequestStoragePermission() {
-        if (ContextCompat.checkSelfPermission(
-                this,
-                Manifest.permission.READ_EXTERNAL_STORAGE
-            ) != PackageManager.PERMISSION_GRANTED ||
-            ContextCompat.checkSelfPermission(
-                this,
-                Manifest.permission.WRITE_EXTERNAL_STORAGE
-            ) != PackageManager.PERMISSION_GRANTED
-        ) {
-            ActivityCompat.requestPermissions(
-                this,
-                arrayOf(
-                    Manifest.permission.READ_EXTERNAL_STORAGE,
-                    Manifest.permission.WRITE_EXTERNAL_STORAGE
-                ),
-                STORAGE_PERMISSION_CODE
-            )
-        } else {
-            //storage permission granted
-        }
-    }
-
-    override fun onRequestPermissionsResult(
-        requestCode: Int,
-        permissions: Array<out String>,
-        grantResults: IntArray
-    ) {
-        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        if (requestCode == STORAGE_PERMISSION_CODE) {
-            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                Toast.makeText(this, "Storage permissions granted", Toast.LENGTH_SHORT).show()
-            } else {
-                Toast.makeText(this, "Storage permissions denied", Toast.LENGTH_SHORT).show()
-            }
-        }
-    }
-
-    private fun setupFabButton() {
-        binding.fabAdd.setOnClickListener {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
-                type = "image/*"
-                addCategory(Intent.CATEGORY_OPENABLE)
-                putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
-                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
-            }
-            pickImageLauncher.launch(intent)
-        }
-    }
-
-    override fun openPreview() {
-        val intent = Intent(this, PreviewActivity::class.java).apply {
-            putExtra("type", fileType)
-        }
-        startActivity(intent)
-    }
-}

app/src/main/java/devs/org/calculator/activities/MainActivity.kt

@@ -1,5 +1,6 @@
 package devs.org.calculator.activities
 
+import android.annotation.SuppressLint
 import android.content.Intent
 import android.content.pm.PackageManager
 import android.net.Uri
@@ -8,6 +9,7 @@ import android.os.Bundle
 import android.os.Environment
 import android.util.Log
 import android.widget.Toast
+import androidx.activity.enableEdgeToEdge
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.annotation.RequiresApi
@@ -20,40 +22,90 @@ import devs.org.calculator.utils.DialogUtil
 import devs.org.calculator.utils.FileManager
 import devs.org.calculator.utils.PrefsUtil
 import net.objecthunter.exp4j.ExpressionBuilder
+import java.util.regex.Pattern
+import androidx.core.content.edit
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import devs.org.calculator.utils.StoragePermissionUtil
 
-class MainActivity : AppCompatActivity(), DialogActionsCallback {
+class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.DialogCallback {
     private lateinit var binding: ActivityMainBinding
     private var currentExpression = "0"
     private var lastWasOperator = false
     private var hasDecimal = false
+    private var lastWasPercent = false
     private lateinit var launcher: ActivityResultLauncher<Intent>
     private lateinit var baseDocumentTreeUri: Uri
     private val dialogUtil = DialogUtil(this)
     private val fileManager = FileManager(this, this)
+    private val sp by lazy { getSharedPreferences("app", MODE_PRIVATE) }
+    private lateinit var storagePermissionUtil: StoragePermissionUtil
+    private lateinit var permissionLauncher: ActivityResultLauncher<Array<String>>
 
     @RequiresApi(Build.VERSION_CODES.R)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
+        enableEdgeToEdge()
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, 0, systemBars.right, systemBars.bottom)
+            insets
+        }
+
+        permissionLauncher = registerForActivityResult(
+            ActivityResultContracts.RequestMultiplePermissions()
+        ) { permissions ->
+            storagePermissionUtil.handlePermissionResult(permissions)
+        }
+
+        // Initialize StoragePermissionUtil
+        storagePermissionUtil = StoragePermissionUtil(this)
 
         launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
             handleActivityResult(result)
         }
-
-        // Ask permission
-        if(!Environment.isExternalStorageManager()) {
-            dialogUtil.showMaterialDialog(
-                "Storage Permission",
-                "To ensure the app works properly and allows you to easily hide or unhide your private files, please grant storage access permission.\n" +
-                        "\n" +
-                        "For devices running Android 11 or higher, you'll need to grant the 'All Files Access' permission.",
-                "Grant",
-                "Cancel",
-                this
-            )
+        if (sp.getBoolean("isFirst", true)){
+            binding.display.text = getString(R.string.enter_123456)
         }
+
+
+        if (!storagePermissionUtil.hasStoragePermission()) {
+            dialogUtil.showMaterialDialog(
+                getString(R.string.storage_permission),
+                getString(R.string.to_ensure_the_app_works_properly_and_allows_you_to_easily_hide_or_un_hide_your_private_files_please_grant_storage_access_permission) +
+                        "\n" +
+                        getString(R.string.for_devices_running_android_11_or_higher_you_ll_need_to_grant_the_all_files_access_permission),
+                getString(R.string.grant_permission),
+                getString(R.string.later),
+                object : DialogUtil.DialogCallback {
+                    override fun onPositiveButtonClicked() {
+                        storagePermissionUtil.requestStoragePermission(permissionLauncher) {
+                            Toast.makeText(this@MainActivity, getString(R.string.permission_granted), Toast.LENGTH_SHORT).show()
+                        }
+
+                    }
+
+                    override fun onNegativeButtonClicked() {
+                        Toast.makeText(this@MainActivity,
+                            getString(R.string.storage_permission_is_required_for_the_app_to_function_properly),
+                            Toast.LENGTH_LONG).show()
+                    }
+
+                    override fun onNaturalButtonClicked() {
+                        Toast.makeText(this@MainActivity,
+                            getString(R.string.you_can_grant_permission_later_from_settings),
+                            Toast.LENGTH_LONG).show()
+                    }
+                })
+        }
+
+
+
         setupNumberButton(binding.btn0, "0")
+        setupNumberButton(binding.btn00, "00")
         setupNumberButton(binding.btn1, "1")
         setupNumberButton(binding.btn2, "2")
         setupNumberButton(binding.btn3, "3")
@@ -71,10 +123,11 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
         binding.btnClear.setOnClickListener { clearDisplay() }
         binding.btnDot.setOnClickListener { addDecimal() }
         binding.btnEquals.setOnClickListener { calculateResult() }
-        binding.btnPercent.setOnClickListener { calculatePercentage() }
+        binding.btnPercent.setOnClickListener { addPercentage() }
         binding.cut.setOnClickListener { cutNumbers() }
     }
 
+
     private fun handleActivityResult(result: androidx.activity.result.ActivityResult) {
         if (result.resultCode == RESULT_OK) {
             result.data?.data?.let { uri ->
@@ -83,10 +136,8 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
                 contentResolver.takePersistableUriPermission(uri, takeFlags)
 
                 val preferences = getSharedPreferences("com.example.fileutility", MODE_PRIVATE)
-                preferences.edit().putString("filestorageuri", uri.toString()).apply()
+                preferences.edit { putString("filestorageuri", uri.toString()) }
             }
-        } else {
-            Log.e("FileUtility", "Error occurred or operation cancelled: $result")
         }
     }
 
@@ -98,54 +149,167 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
                 currentExpression += number
             }
             lastWasOperator = false
+            lastWasPercent = false
             updateDisplay()
         }
     }
 
     private fun setupOperatorButton(button: MaterialButton, operator: String) {
         button.setOnClickListener {
-            if (!lastWasOperator) {
+            if (lastWasOperator) {
+                currentExpression = currentExpression.substring(0, currentExpression.length - 1) +
+                        when (operator) {
+                            "×" -> "*"
+                            else -> operator
+                        }
+            } else if (!lastWasPercent) {
                 currentExpression += when (operator) {
                     "×" -> "*"
                     else -> operator
                 }
                 lastWasOperator = true
+                lastWasPercent = false
                 hasDecimal = false
             }
             updateDisplay()
         }
     }
 
-
     private fun clearDisplay() {
         currentExpression = "0"
         binding.total.text = ""
         lastWasOperator = false
+        lastWasPercent = false
         hasDecimal = false
         updateDisplay()
     }
 
     private fun addDecimal() {
-        if (!hasDecimal && !lastWasOperator) {
+        if (!hasDecimal && !lastWasOperator && !lastWasPercent) {
             currentExpression += "."
             hasDecimal = true
             updateDisplay()
         }
     }
 
-    private fun calculatePercentage() {
-        try {
-            val value = currentExpression.toDouble()
-            currentExpression = (value / 100).toString()
+    private fun addPercentage() {
+        if (!lastWasOperator && !lastWasPercent) {
+            currentExpression += "%"
+            lastWasPercent = true
             updateDisplay()
-        } catch (e: Exception) {
-            binding.display.text = getString(R.string.invalid_message)
         }
     }
 
+    private fun preprocessExpression(expression: String): String {
+        val percentagePattern = Pattern.compile("(\\d+\\.?\\d*)%")
+        val operatorPercentPattern = Pattern.compile("([+\\-*/])(\\d+\\.?\\d*)%")
+
+        var processedExpression = expression
+        val matcher = percentagePattern.matcher(processedExpression)
+        while (matcher.find()) {
+            val fullMatch = matcher.group(0)
+            val number = matcher.group(1)
+
+            val start = matcher.start()
+            if (start == 0 || !isOperator(processedExpression[start-1].toString())) {
+                val percentageValue = number!!.toDouble() / 100
+                processedExpression = processedExpression.replace(fullMatch!!.toString(), percentageValue.toString())
+            }
+        }
+        val opMatcher = operatorPercentPattern.matcher(processedExpression)
+        val sb = StringBuilder(processedExpression)
+        val matches = mutableListOf<Triple<Int, Int, String>>()
+
+        while (opMatcher.find()) {
+            val operator = opMatcher.group(1)
+            val percentValue = opMatcher.group(2)!!.toDouble()
+            val start = opMatcher.start()
+            val end = opMatcher.end()
+
+            matches.add(Triple(start, end, "$operator$percentValue%"))
+        }
+
+        for (match in matches.reversed()) {
+            val (start, end, fullMatch) = match
+
+            var leftNumberStart = start - 1
+
+            if (leftNumberStart >= 0 && sb[leftNumberStart] == ')') {
+                var openParens = 1
+                leftNumberStart--
+
+                while (leftNumberStart >= 0 && openParens > 0) {
+                    if (sb[leftNumberStart] == ')') openParens++
+                    else if (sb[leftNumberStart] == '(') openParens--
+                    leftNumberStart--
+                }
+
+                if (leftNumberStart >= 0) {
+                    while (leftNumberStart >= 0 && (isDigit(sb[leftNumberStart].toString()) || sb[leftNumberStart] == '.' || sb[leftNumberStart] == '-')) {
+                        leftNumberStart--
+                    }
+                    leftNumberStart++
+                } else {
+                    leftNumberStart = 0
+                }
+            } else {
+
+                while (leftNumberStart >= 0 && (isDigit(sb[leftNumberStart].toString()) || sb[leftNumberStart] == '.')) {
+                    leftNumberStart--
+                }
+                leftNumberStart++
+            }
+
+            if (leftNumberStart < start) {
+                val leftPart = sb.substring(leftNumberStart, start)
+
+                try {
+
+                    val baseNumber = evaluateExpression(leftPart)
+                    val operator = fullMatch.substring(0, 1)
+                    val percentNumber = fullMatch.substring(1, fullMatch.length - 1).toDouble()
+
+                    val percentValue = baseNumber * (percentNumber / 100)
+
+                    val newValue = when (operator) {
+                        "+" -> baseNumber + percentValue
+                        "-" -> baseNumber - percentValue
+                        "*" -> baseNumber * (percentNumber / 100)
+                        "/" -> baseNumber / (percentNumber / 100)
+                        else -> baseNumber
+                    }
+
+                    sb.replace(leftNumberStart, end, newValue.toString())
+                } catch (e: Exception) {
+                    Log.e("Calculator", "Error processing percentage expression: $e")
+                }
+            }
+        }
+
+        return sb.toString()
+    }
+
+    private fun isOperator(char: String): Boolean {
+        return char == "+" || char == "-" || char == "*" || char == "/"
+    }
+
+    private fun isDigit(char: String): Boolean {
+        return char.matches(Regex("[0-9]"))
+    }
+
+    private fun evaluateExpression(expression: String): Double {
+        return try {
+            ExpressionBuilder(expression).build().evaluate()
+        } catch (_: Exception) {
+            expression.toDouble()
+        }
+    }
+
+    @SuppressLint("DefaultLocale")
     private fun calculateResult() {
         if (currentExpression == "123456") {
             val intent = Intent(this, SetupPasswordActivity::class.java)
+            sp.edit { putBoolean("isFirst", false) }
             intent.putExtra("password", currentExpression)
             startActivity(intent)
             clearDisplay()
@@ -153,7 +317,7 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
         }
 
         if (PrefsUtil(this).validatePassword(currentExpression)) {
-            val intent = Intent(this, HiddenVaultActivity::class.java)
+            val intent = Intent(this, HiddenActivity::class.java)
             intent.putExtra("password", currentExpression)
             startActivity(intent)
             clearDisplay()
@@ -161,8 +325,13 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
         }
 
         try {
-            currentExpression = currentExpression.replace("×", "*")
-            val expression = ExpressionBuilder(currentExpression).build()
+            var processedExpression = currentExpression.replace("×", "*")
+
+            if (processedExpression.contains("%")) {
+                processedExpression = preprocessExpression(processedExpression)
+            }
+
+            val expression = ExpressionBuilder(processedExpression).build()
             val result = expression.evaluate()
 
             currentExpression = if (result.toLong().toDouble() == result) {
@@ -172,16 +341,17 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
             }
 
             lastWasOperator = false
+            lastWasPercent = false
             hasDecimal = currentExpression.contains(".")
 
             updateDisplay()
             binding.total.text = ""
         } catch (e: Exception) {
-            binding.display.text = getString(R.string.invalid_message)
+            e.printStackTrace()
         }
     }
 
-
+    @SuppressLint("DefaultLocale")
     private fun updateDisplay() {
         binding.display.text = currentExpression.replace("*", "×")
 
@@ -191,30 +361,57 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
         }
 
         try {
-            val expression = ExpressionBuilder(currentExpression).build()
+            if (currentExpression.isEmpty()) {
+                binding.total.text = ""
+                return
+            }
+
+            var processedExpression = currentExpression.replace("×", "*")
+
+            if (isOperator(processedExpression.last().toString())) {
+                processedExpression = processedExpression.substring(0, processedExpression.length - 1)
+            }
+
+            if (processedExpression.contains("%")) {
+                processedExpression = preprocessExpression(processedExpression)
+            }
+
+            val expression = ExpressionBuilder(processedExpression).build()
             val result = expression.evaluate()
+
             val formattedResult = if (result.toLong().toDouble() == result) {
                 result.toLong().toString()
             } else {
                 String.format("%.2f", result)
             }
-
-            binding.total.text = formattedResult
-        } catch (e: Exception) {
+            if (sp.getBoolean("isFirst", true) && (currentExpression == "123456" || binding.display.text.toString() == "123456")){
+                binding.total.text = getString(R.string.now_enter_button)
+            }else binding.total.text = formattedResult
+        } catch (_: Exception) {
             binding.total.text = ""
         }
     }
 
-
     private fun cutNumbers() {
         if (currentExpression.isNotEmpty()){
             if (currentExpression.length == 1){
-                currentExpression = currentExpression.substring(0, currentExpression.length - 1)
                 currentExpression = "0"
-            }else currentExpression = currentExpression.substring(0, currentExpression.length - 1)
-        }else currentExpression = "0"
-        updateDisplay()
+            } else {
+                val lastChar = currentExpression.last()
+                currentExpression = currentExpression.substring(0, currentExpression.length - 1)
 
+                if (lastChar == '%') {
+                    lastWasPercent = false
+                } else if (isOperator(lastChar.toString())) {
+                    lastWasOperator = false
+                } else if (lastChar == '.') {
+                    hasDecimal = false
+                }
+            }
+        } else {
+            currentExpression = "0"
+        }
+        updateDisplay()
     }
 
     override fun onPositiveButtonClicked() {
@@ -222,23 +419,21 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback {
     }
 
     override fun onNegativeButtonClicked() {
-
+        Toast.makeText(this, getString(R.string.storage_permission_is_required_for_the_app_to_function_properly), Toast.LENGTH_LONG).show()
     }
 
     override fun onNaturalButtonClicked() {
-
+        Toast.makeText(this, getString(R.string.you_can_grant_permission_later_from_settings), Toast.LENGTH_LONG).show()
     }
 
     override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults)
         if (requestCode == 6767) {
             if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                Toast.makeText(this, "Permission granted", Toast.LENGTH_SHORT).show()
+                Toast.makeText(this, getString(R.string.permission_granted), Toast.LENGTH_SHORT).show()
             } else {
-                Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show()
+                Toast.makeText(this, getString(R.string.permission_denied), Toast.LENGTH_SHORT).show()
             }
         }
     }
-}
-
-
+}

app/src/main/java/devs/org/calculator/activities/PreviewActivity.kt

@@ -2,180 +2,353 @@ package devs.org.calculator.activities
 
 import android.net.Uri
 import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+import android.view.WindowManager
+import android.widget.Toast
+import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
 import androidx.lifecycle.lifecycleScope
-import androidx.viewpager.widget.ViewPager
 import androidx.viewpager2.widget.ViewPager2
+import devs.org.calculator.R
 import devs.org.calculator.adapters.ImagePreviewAdapter
-import devs.org.calculator.callbacks.DialogActionsCallback
+import devs.org.calculator.database.AppDatabase
+import devs.org.calculator.database.HiddenFileRepository
 import devs.org.calculator.databinding.ActivityPreviewBinding
 import devs.org.calculator.utils.DialogUtil
 import devs.org.calculator.utils.FileManager
+import devs.org.calculator.utils.PrefsUtil
+import devs.org.calculator.utils.SecurityUtils
 import kotlinx.coroutines.launch
 import java.io.File
-import devs.org.calculator.R
 
 class PreviewActivity : AppCompatActivity() {
 
     private lateinit var binding: ActivityPreviewBinding
     private var currentPosition: Int = 0
-    private lateinit var files: List<File>
+    private var files: MutableList<File> = mutableListOf()
     private lateinit var type: String
+    private lateinit var folder: String
     private lateinit var filetype: FileManager.FileType
     private lateinit var adapter: ImagePreviewAdapter
     private lateinit var fileManager: FileManager
     private val dialogUtil = DialogUtil(this)
+    private val mainHandler = Handler(Looper.getMainLooper())
+    private val prefs: PrefsUtil by lazy { PrefsUtil(this) }
+    private val hiddenFileRepository: HiddenFileRepository by lazy {
+        HiddenFileRepository(AppDatabase.getDatabase(this).hiddenFileDao())
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityPreviewBinding.inflate(layoutInflater)
         setContentView(binding.root)
-
+        enableEdgeToEdge()
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
         fileManager = FileManager(this, this)
 
         currentPosition = intent.getIntExtra("position", 0)
-        type = intent.getStringExtra("type").toString()
+        type = intent.getStringExtra("type") ?: "IMAGE"
+        folder = intent.getStringExtra("folder") ?: ""
 
         setupFileType()
-        files = fileManager.getFilesInHiddenDir(filetype)
-
+        loadFiles()
         setupImagePreview()
-        clickListeners()
+        setupClickListeners()
+        setupPageChangeCallback()
+    }
 
-        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
-            override fun onPageSelected(position: Int) {
-                super.onPageSelected(position)
-                
-            }
-        })
+    override fun onResume() {
+        super.onResume()
+        setupFlagSecure()
+    }
 
+    override fun onPause() {
+        super.onPause()
+        adapter.releaseAllResources()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        adapter.releaseAllResources()
+    }
+
+    private fun setupFlagSecure() {
+        if (prefs.getBoolean("screenshot_restriction", true)) {
+            window.setFlags(
+                WindowManager.LayoutParams.FLAG_SECURE,
+                WindowManager.LayoutParams.FLAG_SECURE
+            )
+        }
     }
 
     private fun setupFileType() {
         when (type) {
             "IMAGE" -> {
                 filetype = FileManager.FileType.IMAGE
-                binding.title.text = "Preview Images"
+                binding.title.text = getString(R.string.preview_images)
             }
+
             "VIDEO" -> {
                 filetype = FileManager.FileType.VIDEO
-                binding.title.text = "Preview Videos"
+                binding.title.text = getString(R.string.preview_videos)
             }
+
             "AUDIO" -> {
                 filetype = FileManager.FileType.AUDIO
-                binding.title.text = "Preview Audios"
+                binding.title.text = getString(R.string.preview_audios)
             }
+
             else -> {
                 filetype = FileManager.FileType.DOCUMENT
-                binding.title.text = "Preview Documents"
+                binding.title.text = getString(R.string.preview_documents)
             }
         }
     }
 
+    private fun loadFiles() {
+        try {
+            val filesList = fileManager.getFilesInHiddenDirFromFolder(filetype, folder = folder)
+            files = filesList.toMutableList()
+
+            if (currentPosition >= files.size) {
+                currentPosition = 0
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            files = mutableListOf()
+        }
+    }
+
     private fun setupImagePreview() {
-        adapter = ImagePreviewAdapter(this, filetype)
+        if (files.isEmpty()) {
+            finish()
+            return
+        }
+
+        adapter = ImagePreviewAdapter(this, this)
         adapter.images = files
         binding.viewPager.adapter = adapter
-
-        binding.viewPager.setCurrentItem(currentPosition, false)
-
-        val fileUri = Uri.fromFile(files[currentPosition])
-        val fileName = FileManager.FileName(this).getFileNameFromUri(fileUri).toString()
-    }
-
-
-    override fun onPause() {
-        super.onPause()
-        if (filetype == FileManager.FileType.AUDIO) {
-            (binding.viewPager.adapter as? ImagePreviewAdapter)?.currentMediaPlayer?.pause()
+        if (currentPosition < files.size) {
+            binding.viewPager.setCurrentItem(currentPosition, false)
         }
+
+        updateFileInfo()
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        if (filetype == FileManager.FileType.AUDIO) {
-            (binding.viewPager.adapter as? ImagePreviewAdapter)?.let { adapter ->
-                adapter.currentMediaPlayer?.release()
-                adapter.currentMediaPlayer = null
+    private fun setupPageChangeCallback() {
+        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
+            override fun onPageSelected(position: Int) {
+                super.onPageSelected(position)
+                currentPosition = position
+                updateFileInfo()
             }
+        })
+    }
+
+    private fun updateFileInfo() {
+        if (files.isNotEmpty() && currentPosition < files.size) {
+            val fileUri = Uri.fromFile(files[currentPosition])
+            val fileName = FileManager.FileName(this).getFileNameFromUri(fileUri) ?: "Unknown"
+            //For Now File Name not Needed, i am keeping it for later use
         }
     }
 
+    private fun setupClickListeners() {
+        binding.back.setOnClickListener {
+            finish()
+        }
 
-    private fun clickListeners() {
         binding.delete.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUriImage(this, files[binding.viewPager.currentItem], filetype)
-            if (fileUri != null) {
-                dialogUtil.showMaterialDialog(
-                    "Delete File",
-                    "Are you sure to Delete this file permanently?",
-                    "Delete Permanently",
-                    "Cancel",
-                    object : DialogActionsCallback{
-                        override fun onPositiveButtonClicked() {
-                            lifecycleScope.launch {
-                                FileManager(this@PreviewActivity, this@PreviewActivity).deletePhotoFromExternalStorage(fileUri)
-                                removeFileFromList(binding.viewPager.currentItem)
-                            }
-                        }
-
-                        override fun onNegativeButtonClicked() {
-
-                        }
-
-                        override fun onNaturalButtonClicked() {
-
-                        }
-
-                    }
-                )
-            }
+            handleDeleteFile()
         }
 
         binding.unHide.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUriImage(this, files[binding.viewPager.currentItem], filetype)
-            if (fileUri != null) {
-                dialogUtil.showMaterialDialog(
-                    "Unhide File",
-                    "Are you sure you want to Unhide this file?",
-                    "Unhide",
-                    "Cancel",
-                    object : DialogActionsCallback{
-                        override fun onPositiveButtonClicked() {
-                            lifecycleScope.launch {
-                                FileManager(this@PreviewActivity, this@PreviewActivity).copyFileToNormalDir(fileUri)
-                                removeFileFromList(binding.viewPager.currentItem)
+            performFileUnHiding()
+        }
+        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
+            override fun onPageSelected(position: Int) {
+                super.onPageSelected(position)
+                adapter.onItemScrolledAway(currentPosition)
+                currentPosition = position
+            }
+        })
+    }
+
+    private fun handleDeleteFile() {
+        if (files.isEmpty() || currentPosition >= files.size) return
+
+        val currentFile = files[currentPosition]
+        val fileUri = FileManager.FileManager().getContentUriImage(this, currentFile)
+
+        if (fileUri != null) {
+            dialogUtil.showMaterialDialog(
+                getString(R.string.delete_file),
+                getString(R.string.are_you_sure_to_delete_this_file_permanently),
+                getString(R.string.delete_permanently),
+                getString(R.string.cancel),
+                object : DialogUtil.DialogCallback {
+                    override fun onPositiveButtonClicked() {
+                        lifecycleScope.launch {
+                            try {
+                                val hiddenFile =
+                                    hiddenFileRepository.getHiddenFileByPath(currentFile.absolutePath)
+                                hiddenFile?.let {
+                                    hiddenFileRepository.deleteHiddenFile(it)
+                                }
+
+                                fileManager.deletePhotoFromExternalStorage(fileUri)
+                                removeFileFromList(currentPosition)
+                            } catch (e: Exception) {
+                                e.printStackTrace()
                             }
                         }
-
-                        override fun onNegativeButtonClicked() {
-
-                        }
-
-                        override fun onNaturalButtonClicked() {
-
-                        }
-
                     }
-                )
-            }
+
+                    override fun onNegativeButtonClicked() {}
+
+                    override fun onNaturalButtonClicked() {}
+                }
+            )
         }
     }
 
+    private fun performFileUnHiding() {
+        if (files.isEmpty() || currentPosition >= files.size) return
+        val file = files[currentPosition]
+
+        dialogUtil.showMaterialDialog(
+            getString(R.string.un_hide_file),
+            getString(R.string.are_you_sure_you_want_to_un_hide_this_file),
+            getString(R.string.un_hide),
+            getString(R.string.cancel),
+            object : DialogUtil.DialogCallback {
+                override fun onPositiveButtonClicked() {
+                    lifecycleScope.launch {
+                        var allUnhidden = true
+                        try {
+                            val hiddenFile = hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                            if (hiddenFile != null){
+                                if (hiddenFile.isEncrypted) {
+                                    val originalExtension = hiddenFile.originalExtension
+                                    val decryptedFile = SecurityUtils.changeFileExtension(file, originalExtension)
+
+                                    if (SecurityUtils.decryptFile(this@PreviewActivity, file, decryptedFile)) {
+                                        if (decryptedFile.exists() && decryptedFile.length() > 0) {
+                                            val fileUri = FileManager.FileManager()
+                                                .getContentUriImage(this@PreviewActivity, decryptedFile)
+                                            if (fileUri != null) {
+                                                val result = fileManager.copyFileToNormalDir(fileUri)
+                                                if (result != null) {
+                                                    hiddenFile.let {
+                                                        hiddenFileRepository.deleteHiddenFile(it)
+                                                    }
+                                                    file.delete()
+                                                    decryptedFile.delete()
+                                                    removeFileFromList(currentPosition)
+                                                } else {
+                                                    decryptedFile.delete()
+                                                    allUnhidden = false
+                                                }
+                                            } else {
+                                                decryptedFile.delete()
+                                                allUnhidden = false
+                                            }
+                                        } else {
+                                            decryptedFile.delete()
+                                            allUnhidden = false
+                                        }
+                                    } else {
+                                        if (decryptedFile.exists()) {
+                                            decryptedFile.delete()
+                                        }
+                                        allUnhidden = false
+                                    }
+                                } else {
+                                    val fileUri = FileManager.FileManager().getContentUriImage(this@PreviewActivity, file)
+                                    if (fileUri != null) {
+                                        val result = fileManager.copyFileToNormalDir(fileUri)
+                                        if (result != null) {
+                                            hiddenFile.let {
+                                                hiddenFileRepository.deleteHiddenFile(it)
+                                            }
+                                            file.delete()
+                                            removeFileFromList(currentPosition)
+                                        } else {
+                                            allUnhidden = false
+                                        }
+                                    } else {
+                                        allUnhidden = false
+                                    }
+                                }
+                            }else{
+                                val fileUri = FileManager.FileManager().getContentUriImage(this@PreviewActivity, file)
+                                if (fileUri != null) {
+                                    val result = fileManager.copyFileToNormalDir(fileUri)
+                                    if (result != null) {
+                                        file.delete()
+                                        removeFileFromList(currentPosition)
+                                    } else {
+                                        allUnhidden = false
+                                    }
+                                } else {
+                                    allUnhidden = false
+                                }
+                            }
+
+                        } catch (_: Exception) {
+
+                            allUnhidden = false
+                        }
+
+                        mainHandler.post {
+                            val message = if (allUnhidden) {
+                                getString(R.string.file_unhidden_successfully)
+                            } else {
+                                getString(R.string.something_went_wrong)
+                            }
+
+                            Toast.makeText(this@PreviewActivity, message, Toast.LENGTH_SHORT).show()
+                        }
+                    }
+                }
+
+                override fun onNegativeButtonClicked() {}
+
+                override fun onNaturalButtonClicked() {}
+            }
+        )
+
+
+    }
+
     private fun removeFileFromList(position: Int) {
-        val updatedFiles = files.toMutableList().apply { removeAt(position) }
-        files = updatedFiles
-        adapter.images = updatedFiles // Update adapter with the new list
-
-        // Update the ViewPager's position
-        if (!updatedFiles.isNotEmpty()) finish()
+        if (position < 0 || position >= files.size) return
+        adapter.releaseAllResources()
+        files.removeAt(position)
+        adapter.images = files
+        if (files.isEmpty()) {
+            finish()
+            return
+        }
+        currentPosition = if (position >= files.size) {
+            files.size - 1
+        } else {
+            position
+        }
 
+        binding.viewPager.setCurrentItem(currentPosition, false)
+        updateFileInfo()
     }
 
     override fun onSupportNavigateUp(): Boolean {
-        onBackPressed()
+        finish()
         return true
     }
-
-
-}
+}

app/src/main/java/devs/org/calculator/activities/SettingsActivity.kt

@@ -0,0 +1,229 @@
+package devs.org.calculator.activities
+
+import android.content.Intent
+import android.os.Bundle
+import android.view.View
+import android.view.WindowManager
+import android.widget.EditText
+import android.widget.Toast
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.net.toUri
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.google.android.material.color.DynamicColors
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import com.google.android.material.snackbar.Snackbar
+import devs.org.calculator.R
+import devs.org.calculator.databinding.ActivitySettingsBinding
+import devs.org.calculator.utils.PrefsUtil
+import devs.org.calculator.utils.SecurityUtils
+
+class SettingsActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivitySettingsBinding
+    private lateinit var prefs: PrefsUtil
+    private var DEV_GITHUB_URL = ""
+    private var GITHUB_URL = ""
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivitySettingsBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        prefs = PrefsUtil(this)
+        enableEdgeToEdge()
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
+        DEV_GITHUB_URL = getString(R.string.github_profile)
+        GITHUB_URL = getString(R.string.calculator_hide_files, DEV_GITHUB_URL)
+        setupUI()
+        loadSettings()
+        setupListeners()
+    }
+
+    private fun setupUI() {
+        binding.back.setOnClickListener {
+            onBackPressed()
+        }
+    }
+
+
+    private fun loadSettings() {
+
+        binding.dynamicThemeSwitch.isChecked = prefs.getBoolean("dynamic_theme", true)
+
+        val themeMode = prefs.getInt("theme_mode", AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+        binding.themeModeSwitch.isChecked = themeMode != AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+        
+        when (themeMode) {
+            AppCompatDelegate.MODE_NIGHT_YES -> binding.darkThemeRadio.isChecked = true
+            AppCompatDelegate.MODE_NIGHT_NO -> binding.lightThemeRadio.isChecked = true
+            else -> binding.systemThemeRadio.isChecked = true
+        }
+
+        val isUsingCustomKey = SecurityUtils.isUsingCustomKey(this)
+        binding.customKeyStatus.isChecked = isUsingCustomKey
+        binding.screenshotRestrictionSwitch.isChecked = prefs.getBoolean("screenshot_restriction", true)
+        binding.showFileNames.isChecked = prefs.getBoolean("showFileName", true)
+        binding.encryptionSwitch.isChecked = prefs.getBoolean("encryption", false)
+
+        updateThemeModeVisibility()
+    }
+
+    private fun setupListeners() {
+
+        binding.githubButton.setOnClickListener {
+            openUrl(GITHUB_URL)
+        }
+
+        binding.devGithubButton.setOnClickListener {
+            openUrl(DEV_GITHUB_URL)
+        }
+
+        binding.dynamicThemeSwitch.setOnCheckedChangeListener { _, isChecked ->
+            prefs.setBoolean("dynamic_theme", isChecked)
+            if (!isChecked) {
+                showThemeModeDialog()
+            }else{
+                showThemeModeDialog()
+                if (!prefs.getBoolean("isAppReopened",false)){
+                    DynamicColors.applyToActivityIfAvailable(this)
+                }
+            }
+        }
+        binding.encryptionSwitch.setOnCheckedChangeListener { _, isChecked ->
+            prefs.setBoolean("encryption", isChecked)
+        }
+
+
+        binding.themeModeSwitch.setOnCheckedChangeListener { _, isChecked ->
+            binding.themeRadioGroup.visibility = if (isChecked) View.VISIBLE else View.GONE
+            if (!isChecked) {
+                binding.systemThemeRadio.isChecked = true
+                applyThemeMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
+            }
+        }
+
+        binding.themeRadioGroup.setOnCheckedChangeListener { _, checkedId ->
+            val themeMode = when (checkedId) {
+                R.id.lightThemeRadio -> AppCompatDelegate.MODE_NIGHT_NO
+                R.id.darkThemeRadio -> AppCompatDelegate.MODE_NIGHT_YES
+                else -> AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+            }
+            applyThemeMode(themeMode)
+        }
+
+        binding.screenshotRestrictionSwitch.setOnCheckedChangeListener { _, isChecked ->
+            prefs.setBoolean("screenshot_restriction", isChecked)
+            if (isChecked) {
+                enableScreenshotRestriction()
+            } else {
+                disableScreenshotRestriction()
+            }
+        }
+        binding.showFileNames.setOnCheckedChangeListener { _, isChecked ->
+            prefs.setBoolean("showFileName", isChecked)
+        }
+
+        binding.customKeyStatus.setOnClickListener {
+            showCustomKeyDialog()
+        }
+    }
+
+    private fun updateThemeModeVisibility() {
+        binding.themeRadioGroup.visibility = if (binding.themeModeSwitch.isChecked) View.VISIBLE else View.GONE
+    }
+
+    private fun showThemeModeDialog() {
+        MaterialAlertDialogBuilder(this)
+            .setTitle(getString(R.string.attention))
+            .setMessage(getString(R.string.if_you_turn_on_off_this_option_dynamic_theme_changes_will_be_visible_after_you_reopen_the_app))
+            .setPositiveButton(getString(R.string.ok)) { _, _ ->
+
+            }
+            .show()
+    }
+
+    private fun applyThemeMode(themeMode: Int) {
+        prefs.setInt("theme_mode", themeMode)
+        AppCompatDelegate.setDefaultNightMode(themeMode)
+    }
+
+    private fun enableScreenshotRestriction() {
+        window.setFlags(
+            WindowManager.LayoutParams.FLAG_SECURE,
+            WindowManager.LayoutParams.FLAG_SECURE
+        )
+    }
+
+    private fun disableScreenshotRestriction() {
+        window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
+    }
+
+    private fun openUrl(url: String) {
+        try {
+            val intent = Intent(Intent.ACTION_VIEW, url.toUri())
+            startActivity(intent)
+        } catch (e: Exception) {
+            Snackbar.make(binding.root,
+                getString(R.string.could_not_open_url), Snackbar.LENGTH_SHORT).show()
+        }
+    }
+
+    private fun showCustomKeyDialog() {
+        val dialogView = layoutInflater.inflate(R.layout.dialog_custom_key, null)
+        val keyInput = dialogView.findViewById<EditText>(R.id.keyInput)
+        val confirmKeyInput = dialogView.findViewById<EditText>(R.id.confirmKeyInput)
+
+        MaterialAlertDialogBuilder(this)
+            .setTitle(getString(R.string.set_custom_encryption_key))
+            .setView(dialogView)
+            .setPositiveButton(getString(R.string.set)) { dialog, _ ->
+                val key = keyInput.text.toString()
+                val confirmKey = confirmKeyInput.text.toString()
+
+                if (key.isEmpty()) {
+                    Toast.makeText(this, getString(R.string.key_cannot_be_empty), Toast.LENGTH_SHORT).show()
+                    updateUI()
+                    return@setPositiveButton
+                }
+
+                if (key != confirmKey) {
+                    Toast.makeText(this, getString(R.string.keys_do_not_match), Toast.LENGTH_SHORT).show()
+                    updateUI()
+                    return@setPositiveButton
+                }
+
+                if (SecurityUtils.setCustomKey(this, key)) {
+                    Toast.makeText(this,
+                        getString(R.string.custom_key_set_successfully), Toast.LENGTH_SHORT).show()
+                    updateUI()
+                } else {
+                    Toast.makeText(this,
+                        getString(R.string.failed_to_set_custom_key), Toast.LENGTH_SHORT).show()
+                    updateUI()
+                }
+            }
+            .setNegativeButton(getString(R.string.cancel)){ _, _ ->
+                updateUI()
+            }
+            .setNeutralButton(getString(R.string.delete_key)) { _, _ ->
+                SecurityUtils.clearCustomKey(this)
+                Toast.makeText(this,
+                    getString(R.string.custom_encryption_key_cleared), Toast.LENGTH_SHORT).show()
+                updateUI()
+            }
+            .show()
+    }
+
+    private fun updateUI() {
+        binding.showFileNames.isChecked = prefs.getBoolean("showFileName", true)
+        binding.encryptionSwitch.isChecked = prefs.getBoolean("encryption", false)
+        val isUsingCustomKey = SecurityUtils.isUsingCustomKey(this)
+        binding.customKeyStatus.isChecked = isUsingCustomKey
+    }
+}

app/src/main/java/devs/org/calculator/activities/SetupPasswordActivity.kt

@@ -5,7 +5,11 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.widget.TextView
 import android.widget.Toast
+import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.google.android.material.color.DynamicColors
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.textfield.TextInputEditText
 import devs.org.calculator.databinding.ActivitySetupPasswordBinding
@@ -18,13 +22,19 @@ class SetupPasswordActivity : AppCompatActivity() {
     private lateinit var binding2: ActivityChangePasswordBinding
     private lateinit var prefsUtil: PrefsUtil
     private var hasPassword = false
+    private val prefs:PrefsUtil by lazy { PrefsUtil(this) }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivitySetupPasswordBinding.inflate(layoutInflater)
         binding2 = ActivityChangePasswordBinding.inflate(layoutInflater)
         setContentView(binding.root)
-
+        enableEdgeToEdge()
+        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
+            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
+            insets
+        }
         prefsUtil = PrefsUtil(this)
         hasPassword = prefsUtil.hasPassword()
 
@@ -45,70 +55,71 @@ class SetupPasswordActivity : AppCompatActivity() {
             val securityAnswer = binding.etSecurityAnswer.text.toString()
 
             if (password.isEmpty()){
-                binding.etPassword.error = "Enter password"
+                binding.etPassword.error = getString(R.string.enter_password)
                 return@setOnClickListener
             }
             if (confirmPassword.isEmpty()){
-                binding.etConfirmPassword.error = "Confirm password"
+                binding.etConfirmPassword.error = getString(R.string.confirm_password)
                 return@setOnClickListener
             }
             if (securityQuestion.isEmpty()){
-                binding.etSecurityQuestion.error = "Enter security question"
+                binding.etSecurityQuestion.error = getString(R.string.enter_security_question)
                 return@setOnClickListener
             }
             if (securityAnswer.isEmpty()){
-                binding.etSecurityAnswer.error = "Enter security answer"
+                binding.etSecurityAnswer.error = getString(R.string.enter_security_answer)
                 return@setOnClickListener
             }
             if (password != confirmPassword) {
-                binding.etPassword.error = "Passwords don't match"
+                binding.etPassword.error = getString(R.string.passwords_don_t_match)
                 return@setOnClickListener
             }
             prefsUtil.savePassword(password)
             prefsUtil.saveSecurityQA(securityQuestion, securityAnswer)
-            Toast.makeText(this, "Password set successfully", Toast.LENGTH_SHORT).show()
+            Toast.makeText(this, getString(R.string.password_set_successfully), Toast.LENGTH_SHORT).show()
             startActivity(Intent(this, MainActivity::class.java))
             finish()
         }
 
         binding.btnResetPassword.setOnClickListener {
-            // Implement password reset logic
-            // Could use security questions or email verification
             if (prefsUtil.getSecurityQuestion() != null) showSecurityQuestionDialog(prefsUtil.getSecurityQuestion().toString())
-            else Toast.makeText(this, "Security question not set yet.", Toast.LENGTH_SHORT).show()
+            else Toast.makeText(this,
+                getString(R.string.security_question_not_set_yet), Toast.LENGTH_SHORT).show()
 
         }
         binding2.btnChangePassword.setOnClickListener{
             val oldPassword = binding2.etOldPassword.text.toString()
             val newPassword = binding2.etNewPassword.text.toString()
             if (oldPassword.isEmpty()) {
-                binding2.etOldPassword.error = "This field can't be empty"
+                binding2.etOldPassword.error = getString(R.string.this_field_can_t_be_empty)
                 return@setOnClickListener
             }
             if (newPassword.isEmpty()) {
-                binding2.etNewPassword.error = "This field can't be empty"
+                binding2.etNewPassword.error = getString(R.string.this_field_can_t_be_empty)
                 return@setOnClickListener
             }
 
             if (prefsUtil.validatePassword(oldPassword)){
                 if (oldPassword != newPassword){
                     prefsUtil.savePassword(newPassword)
-                    Toast.makeText(this, "Password reset successfully", Toast.LENGTH_SHORT).show()
+                    Toast.makeText(this,
+                        getString(R.string.password_reset_successfully), Toast.LENGTH_SHORT).show()
                     startActivity(Intent(this, MainActivity::class.java))
                     finish()
 
                 }else {
-                    Toast.makeText(this, "Old Password And New Password Not Be Same", Toast.LENGTH_SHORT).show()
-                    binding2.etNewPassword.error = "Old Password And New Password Not Be Same"
+                    Toast.makeText(this,
+                        getString(R.string.old_password_and_new_password_not_be_same), Toast.LENGTH_SHORT).show()
+                    binding2.etNewPassword.error = getString(R.string.old_password_and_new_password_not_be_same)
                 }
             }else {
-                Toast.makeText(this, "Wrong password entered", Toast.LENGTH_SHORT).show()
-                binding2.etOldPassword.error = "Old Password Not Matching"
+                Toast.makeText(this, getString(R.string.wrong_password_entered), Toast.LENGTH_SHORT).show()
+                binding2.etOldPassword.error = getString(R.string.old_password_not_matching)
             }
         }
         binding2.btnResetPassword.setOnClickListener{
             if (prefsUtil.getSecurityQuestion() != null) showSecurityQuestionDialog(prefsUtil.getSecurityQuestion().toString())
-            else Toast.makeText(this, "Security question not set yet.", Toast.LENGTH_SHORT).show()
+            else Toast.makeText(this, getString(R.string.this_field_can_t_be_empty), Toast.LENGTH_SHORT).show()
         }
     }
 
@@ -120,26 +131,28 @@ class SetupPasswordActivity : AppCompatActivity() {
 
 
         MaterialAlertDialogBuilder(this)
-            .setTitle("Answer the Security Question!")
+            .setTitle(getString(R.string.answer_the_security_question))
             .setView(dialogView)
-            .setPositiveButton("Verify") { dialog, _ ->
+            .setPositiveButton(getString(R.string.verify)) { dialog, _ ->
                 val inputEditText: TextInputEditText = dialogView.findViewById(R.id.text_input_edit_text)
                 val userAnswer = inputEditText.text.toString().trim()
 
                 if (userAnswer.isEmpty()) {
-                    Toast.makeText(this, "Answer cannot be empty!", Toast.LENGTH_SHORT).show()
+                    Toast.makeText(this,
+                        getString(R.string.answer_cannot_be_empty), Toast.LENGTH_SHORT).show()
                 } else {
                     if (prefsUtil.validateSecurityAnswer(userAnswer)){
                         prefsUtil.resetPassword()
-                        Toast.makeText(this, "Password successfully reset.", Toast.LENGTH_SHORT).show()
+                        Toast.makeText(this,
+                            getString(R.string.password_successfully_reset), Toast.LENGTH_SHORT).show()
                         dialog.dismiss()
                     }else {
-                        Toast.makeText(this, "Invalid answer!", Toast.LENGTH_SHORT).show()
+                        Toast.makeText(this, getString(R.string.invalid_answer), Toast.LENGTH_SHORT).show()
                     }
 
                 }
             }
-            .setNegativeButton("Cancel") { dialog, _ ->
+            .setNegativeButton(getString(R.string.cancel)) { dialog, _ ->
 
                 dialog.dismiss()
             }

app/src/main/java/devs/org/calculator/activities/VideoGalleryActivity.kt

@@ -1,80 +0,0 @@
-package devs.org.calculator.activities
-
-import android.content.Intent
-import android.net.Uri
-import android.os.Bundle
-import android.widget.Toast
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.contract.ActivityResultContracts
-import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.utils.FileManager
-import devs.org.calculator.callbacks.FileProcessCallback
-import kotlinx.coroutines.launch
-import java.io.File
-
-class VideoGalleryActivity : BaseGalleryActivity(), FileProcessCallback {
-    override val fileType = FileManager.FileType.VIDEO
-    private lateinit var pickLauncher: ActivityResultLauncher<Intent>
-    private var selectedUri: Uri? = null
-
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setupFabButton()
-
-        pickLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-            if (result.resultCode == RESULT_OK) {
-                val clipData = result.data?.clipData
-                val uriList = mutableListOf<Uri>()
-
-                if (clipData != null) {
-                    for (i in 0 until clipData.itemCount) {
-                        val uri = clipData.getItemAt(i).uri
-                        uriList.add(uri)
-                    }
-                } else {
-                    result.data?.data?.let { uriList.add(it) } // Single file selected
-                }
-
-                if (uriList.isNotEmpty()) {
-                    lifecycleScope.launch {
-                        FileManager(this@VideoGalleryActivity, this@VideoGalleryActivity)
-                            .processMultipleFiles(uriList, fileType,this@VideoGalleryActivity )
-                    }
-                } else {
-                    Toast.makeText(this, "No files selected", Toast.LENGTH_SHORT).show()
-                }
-            }
-        }
-    }
-
-    override fun onFilesProcessedSuccessfully(copiedFiles: List<File>) {
-        Toast.makeText(this@VideoGalleryActivity, "${copiedFiles.size} Videos hidden successfully", Toast.LENGTH_SHORT).show()
-        loadFiles()
-    }
-
-    override fun onFileProcessFailed() {
-        Toast.makeText(this@VideoGalleryActivity, "Failed to hide videos", Toast.LENGTH_SHORT).show()
-    }
-
-    private fun setupFabButton() {
-        binding.fabAdd.setOnClickListener {
-            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
-                type = "video/*"
-                addCategory(Intent.CATEGORY_OPENABLE)
-                putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true)
-                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                addFlags(Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION)
-            }
-            pickLauncher.launch(intent)
-        }
-    }
-
-    override fun openPreview() {
-        val intent = Intent(this, PreviewActivity::class.java).apply {
-            putExtra("type", fileType)
-        }
-        startActivity(intent)
-    }
-}

app/src/main/java/devs/org/calculator/adapters/FileAdapter.kt

@@ -1,196 +1,595 @@
 package devs.org.calculator.adapters
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.content.Intent
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.ImageView
 import android.widget.Toast
+import androidx.core.content.FileProvider
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.lifecycleScope
-import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
 import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import devs.org.calculator.R
 import devs.org.calculator.activities.PreviewActivity
-import devs.org.calculator.callbacks.DialogActionsCallback
-import devs.org.calculator.utils.DialogUtil
+import devs.org.calculator.database.AppDatabase
+import devs.org.calculator.database.HiddenFileEntity
+import devs.org.calculator.database.HiddenFileRepository
+import devs.org.calculator.databinding.ListItemFileBinding
 import devs.org.calculator.utils.FileManager
+import devs.org.calculator.utils.FolderManager
+import devs.org.calculator.utils.SecurityUtils
+import devs.org.calculator.utils.SecurityUtils.getDecryptedPreviewFile
+import devs.org.calculator.utils.SecurityUtils.getUriForPreviewFile
 import kotlinx.coroutines.launch
 import java.io.File
+import java.lang.ref.WeakReference
+import java.util.concurrent.Executors
 
 class FileAdapter(
-    private val fileType: FileManager.FileType,
-    var context: Context,
-    private var lifecycleOwner: LifecycleOwner
-) :
-    ListAdapter<File, FileAdapter.FileViewHolder>(FileDiffCallback()) {
+    private val context: Context,
+    private val lifecycleOwner: LifecycleOwner,
+    private val currentFolder: File,
+    private val showFileName: Boolean,
+    private val onFolderLongClick: (Boolean) -> Unit,
+) : ListAdapter<File, FileAdapter.FilesViewHolder>(FileDiffCallback()) {
 
+
+    private var filesOperationCallback: WeakReference<FilesOperationCallback>? = null
     private val selectedItems = mutableSetOf<Int>()
     private var isSelectionMode = false
-    private var fileName = "Unknown File"
-    private var fileTypes = when (fileType) {
+    private val fileExecutor = Executors.newSingleThreadExecutor()
+    private val mainHandler = Handler(Looper.getMainLooper())
 
-        FileManager.FileType.IMAGE -> {
-            "IMAGE"
-        }
 
-        FileManager.FileType.VIDEO -> {
-            "VIDEO"
-        }
+    interface FilesOperationCallback {
+        fun onFileDeleted(file: File)
+        fun onFileRenamed(oldFile: File, newFile: File)
+        fun onRefreshNeeded()
+        fun onSelectionModeChanged(isSelectionMode: Boolean, selectedCount: Int)
+        fun onSelectionCountChanged(selectedCount: Int)
+    }
 
-        FileManager.FileType.AUDIO -> {
-            "AUDIO"
-        }
+    fun setFilesOperationCallback(callback: FilesOperationCallback?) {
+        filesOperationCallback = callback?.let { WeakReference(it) }
+    }
 
-        else -> "DOCUMENT"
+    val hiddenFileRepository: HiddenFileRepository by lazy {
+        HiddenFileRepository(AppDatabase.getDatabase(context).hiddenFileDao())
+    }
+
+
+    override fun onCreateViewHolder(
+        parent: ViewGroup,
+        viewType: Int,
+    ): FilesViewHolder {
+        val binding =
+            ListItemFileBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+        return FilesViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(
+        holder: FilesViewHolder,
+        position: Int,
+    ) {
+        holder.bind(getItem(position))
 
     }
 
-    inner class FileViewHolder(view: View) : RecyclerView.ViewHolder(view) {
-        private val imageView: ImageView = view.findViewById(R.id.imageView)
 
+    inner class FilesViewHolder(private val binding: ListItemFileBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+        @SuppressLint("FileEndsWithExt")
         fun bind(file: File) {
+            val position = adapterPosition
+            lifecycleOwner.lifecycleScope.launch {
+                try {
+                    hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                    val currentFileData =
+                        hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                    val currentFileType = currentFileData?.fileType ?: FileManager(
+                        context,
+                        lifecycleOwner
+                    ).getFileType(file)
+
+
+                    val isCurrentFileEncrypted = currentFileData?.isEncrypted ?: file.endsWith(
+                        SecurityUtils.ENCRYPTED_EXTENSION
+                    )
+
+                    setupClickListeners(file, currentFileType)
+                    setupDisplay(
+                        file,
+                        currentFileType,
+                        isCurrentFileEncrypted,
+                        currentFileData
+                    )
+                    binding.fileNameTextView.text = if (isCurrentFileEncrypted) currentFileData?.fileName else file.name
+                    binding.fileNameTextView.visibility =
+                        if (showFileName) View.VISIBLE else View.GONE
+                    binding.shade.visibility = if (showFileName) View.VISIBLE else View.GONE
+
+                    if (position != RecyclerView.NO_POSITION) {
+                        val isSelected = selectedItems.contains(position)
+                        updateSelectionUI(isSelected)
+                    }
+                    binding.encrypted.visibility =
+                        if (isCurrentFileEncrypted) View.VISIBLE else View.GONE
+                } catch (e: Exception) {
+                    Log.e("FileAdapter", "Error in bind: ${e.message}")
+                }
+            }
+        }
+
+        private fun openFile(file: File, fileType: FileManager.FileType) {
+            if (!file.exists()) {
+                Toast.makeText(context,
+                    context.getString(R.string.file_no_longer_exists), Toast.LENGTH_SHORT).show()
+                return
+            }
 
             when (fileType) {
+                FileManager.FileType.AUDIO -> openAudioFile(file)
+                FileManager.FileType.IMAGE, FileManager.FileType.VIDEO -> {
+                    lifecycleOwner.lifecycleScope.launch {
+                        try {
+                            val hiddenFile = hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                            if (hiddenFile?.isEncrypted == true || file.extension == FileManager.ENCRYPTED_EXTENSION) {
+                                if (file.extension == FileManager.ENCRYPTED_EXTENSION && hiddenFile == null) {
+                                    showDecryptionTypeDialog(file)
+                                } else {
+                                    val tempFile = File(context.cacheDir, "preview_${file.name}")
+
+                                    if (SecurityUtils.decryptFile(context, file, tempFile)) {
+                                        if (tempFile.exists() && tempFile.length() > 0) {
+                                            mainHandler.post {
+                                                val fileTypeString = when (fileType) {
+                                                    FileManager.FileType.IMAGE -> context.getString(R.string.image)
+                                                    FileManager.FileType.VIDEO -> context.getString(R.string.video)
+                                                    else -> "unknown"
+                                                }
+
+                                                val intent = Intent(context, PreviewActivity::class.java).apply {
+                                                    putExtra("type", fileTypeString)
+                                                    putExtra("folder", currentFolder.toString())
+                                                    putExtra("position", adapterPosition)
+                                                    putExtra("isEncrypted", true)
+                                                    putExtra("tempFile", tempFile.absolutePath)
+                                                }
+                                                context.startActivity(intent)
+                                            }
+                                        } else {
+                                            mainHandler.post {
+                                                Toast.makeText(context, "Failed to prepare file for preview", Toast.LENGTH_SHORT).show()
+                                            }
+                                        }
+                                    } else {
+                                        mainHandler.post {
+                                            Toast.makeText(context, "Failed to decrypt file for preview", Toast.LENGTH_SHORT).show()
+                                        }
+                                    }
+                                }
+                            } else {
+                                openInPreview(fileType)
+                            }
+                        } catch (_: Exception) {
+                            mainHandler.post {
+                                Toast.makeText(context, "Error preparing file for preview", Toast.LENGTH_SHORT).show()
+                            }
+                        }
+                    }
+                }
+                FileManager.FileType.DOCUMENT -> openDocumentFile(file)
+                else -> openDocumentFile(file)
+            }
+        }
+
+        private fun showDecryptionTypeDialog(file: File) {
+            val options = arrayOf("Image", "Video", "Audio")
+            MaterialAlertDialogBuilder(context)
+                .setTitle("Select File Type")
+                .setMessage("Please select the type of file to decrypt")
+                .setItems(options) { _, which ->
+                    val selectedType = when (which) {
+                        0 -> FileManager.FileType.IMAGE
+                        1 -> FileManager.FileType.VIDEO
+                        2 -> FileManager.FileType.AUDIO
+                        else -> FileManager.FileType.DOCUMENT
+                    }
+                    performDecryptionWithType(file, selectedType)
+                }
+                .setNegativeButton("Cancel", null)
+                .show()
+        }
+
+        private fun openInPreview(fileType: FileManager.FileType) {
+            val fileTypeString = when (fileType) {
+                FileManager.FileType.IMAGE -> context.getString(R.string.image)
+                FileManager.FileType.VIDEO -> context.getString(R.string.video)
+                else -> "unknown"
+            }
+
+            val intent = Intent(context, PreviewActivity::class.java).apply {
+                putExtra("type", fileTypeString)
+                putExtra("folder", currentFolder.toString())
+                putExtra("position", adapterPosition)
+            }
+            context.startActivity(intent)
+        }
+
+        private fun openAudioFile(file: File) {
+            val fileType = FileManager(context,lifecycleOwner).getFileType(file)
+            try {
+                val fileTypeString = when (fileType) {
+                    FileManager.FileType.IMAGE -> context.getString(R.string.image)
+                    FileManager.FileType.VIDEO -> context.getString(R.string.video)
+                    else -> "unknown"
+                }
+
+                val intent = Intent(context, PreviewActivity::class.java).apply {
+                    putExtra("type", fileTypeString)
+                    putExtra("folder", currentFolder.toString())
+                    putExtra("position", adapterPosition)
+                }
+                context.startActivity(intent)
+            } catch (_: Exception) {
+                Toast.makeText(
+                    context,
+                    context.getString(R.string.no_audio_player_found),
+                    Toast.LENGTH_SHORT
+                ).show()
+            }
+        }
+
+        private fun openDocumentFile(file: File) {
+            try {
+                val uri = FileProvider.getUriForFile(
+                    context,
+                    "${context.packageName}.fileprovider",
+                    file
+                )
+                val intent = Intent(Intent.ACTION_VIEW).apply {
+                    setDataAndType(uri, "*/*")
+                    putExtra("folder", currentFolder.toString())
+                    addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                }
+                context.startActivity(intent)
+            } catch (_: Exception) {
+
+                Toast.makeText(
+                    context,
+                    context.getString(R.string.no_suitable_app_found_to_open_this_document),
+                    Toast.LENGTH_SHORT
+                ).show()
+            }
+        }
+
+        private fun setupDisplay(
+            file: File,
+            type: FileManager.FileType,
+            isCurrentFileEncrypted: Boolean,
+            metadata: HiddenFileEntity?,
+        ) {
+            when (type) {
                 FileManager.FileType.IMAGE -> {
-                    Glide.with(imageView)
-                        .load(file)
-                        .centerCrop()
-                        .into(imageView)
+                    binding.videoPlay.visibility = View.GONE
+                    binding.fileIconImageView.setPadding(0, 0, 0, 0)
+                    if (isCurrentFileEncrypted) {
+                        try {
+                            val decryptedFile = getDecryptedPreviewFile(context, metadata!!)
+                            if (decryptedFile != null && decryptedFile.exists() && decryptedFile.length() > 0) {
+                                val uri = getUriForPreviewFile(context, decryptedFile)
+                                if (uri != null) {
+                                    Glide.with(context)
+                                        .load(uri)
+                                        .centerCrop()
+                                        .diskCacheStrategy(DiskCacheStrategy.ALL)
+                                        .skipMemoryCache(false)
+                                        .error(R.drawable.encrypted)
+                                        .into(binding.fileIconImageView)
+                                } else {
+                                    showEncryptedIcon()
+                                }
+                            } else {
+                                showEncryptedIcon()
+                            }
+                        } catch (e: Exception) {
+                            Log.e("FileAdapter", "Error displaying encrypted image: ${e.message}")
+                            showEncryptedIcon()
+                        }
+                    } else {
+                        Glide.with(context)
+                            .load(file)
+                            .into(binding.fileIconImageView)
+                    }
                 }
 
                 FileManager.FileType.VIDEO -> {
-                    Glide.with(imageView)
-                        .asBitmap()
-                        .load(file)
-                        .centerCrop()
-                        .into(imageView)
+                    binding.fileIconImageView.setPadding(0, 0, 0, 0)
+                    binding.videoPlay.visibility = View.VISIBLE
+                    if (isCurrentFileEncrypted) {
+                        try {
+                            val decryptedFile = getDecryptedPreviewFile(context, metadata!!)
+                            if (decryptedFile != null && decryptedFile.exists() && decryptedFile.length() > 0) {
+                                val uri = getUriForPreviewFile(context, decryptedFile)
+                                if (uri != null) {
+                                    Glide.with(context)
+                                        .load(uri)
+                                        .centerCrop()
+                                        .diskCacheStrategy(DiskCacheStrategy.NONE)
+                                        .skipMemoryCache(true)
+                                        .error(R.drawable.encrypted)
+                                        .into(binding.fileIconImageView)
+                                    binding.fileIconImageView.setPadding(0, 0, 0, 0)
+                                } else {
+                                    showEncryptedIcon()
+                                }
+                            } else {
+                                showEncryptedIcon()
+                            }
+                        } catch (e: Exception) {
+                            Log.e("FileAdapter", "Error displaying encrypted video: ${e.message}")
+                            showEncryptedIcon()
+                        }
+                    } else {
+                        Glide.with(context)
+                            .load(file)
+                            .into(binding.fileIconImageView)
+                    }
+                }
+
+                FileManager.FileType.AUDIO -> {
+                    binding.videoPlay.visibility = View.GONE
+                    binding.fileIconImageView.setPadding(25, 25, 25, 25)
+                    binding.fileIconImageView.setImageResource(R.drawable.ic_audio)
+
                 }
 
                 else -> {
-                    val resourceId = when (fileType) {
-                        FileManager.FileType.AUDIO -> R.drawable.ic_audio
-                        FileManager.FileType.DOCUMENT -> R.drawable.ic_document
-                        else -> R.drawable.ic_file
-                    }
-                    imageView.setImageResource(resourceId)
+                    binding.videoPlay.visibility = View.GONE
+                    binding.fileIconImageView.setPadding(25, 25, 25, 25)
+                    binding.fileIconImageView.setImageResource(R.drawable.ic_document)
                 }
             }
+        }
+
+        private fun showEncryptedIcon() {
+            binding.fileIconImageView.setImageResource(R.drawable.encrypted)
+        }
+
+
+        private fun updateSelectionUI(isSelected: Boolean) {
+            binding.selectedLayer.visibility = if (isSelected) View.VISIBLE else View.GONE
+            binding.selected.visibility = if (isSelected) View.VISIBLE else View.GONE
+        }
+
+        private fun setupClickListeners(file: File, fileType: FileManager.FileType) {
             itemView.setOnClickListener {
+                val position = adapterPosition
+                if (position == RecyclerView.NO_POSITION) return@setOnClickListener
 
-
-                when(fileType){
-                    FileManager.FileType.AUDIO -> {
-                        // Create an intent to play audio using available audio players
-                        val intent = Intent(Intent.ACTION_VIEW).apply {
-                            setDataAndType(FileManager.FileManager().getContentUriImage(context, file, fileType), "audio/*")
-                            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                        }
-                        try {
-                            context.startActivity(intent)
-                        } catch (e: Exception) {
-                            Toast.makeText(context, "No audio player found!", Toast.LENGTH_SHORT).show()
-                        }
-                    }
-
-                    FileManager.FileType.DOCUMENT -> {
-                        // Create an intent to open the document using available viewers or file managers
-                        val intent = Intent(Intent.ACTION_VIEW).apply {
-                            setDataAndType(FileManager.FileManager().getContentUriImage(context, file, fileType), "*/*")
-                            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                        }
-                        try {
-                            context.startActivity(intent)
-                        } catch (e: Exception) {
-                            Toast.makeText(context, "No suitable app found to open this document!", Toast.LENGTH_SHORT).show()
-                        }
-                    }
-                    else -> {
-                        val intent = Intent(context, PreviewActivity::class.java).apply {
-                            putExtra("type", fileTypes)
-                            putExtra("position", position)
-                        }
-                        context.startActivity(intent)
-                    }
+                if (isSelectionMode) {
+                    toggleSelection(position)
+                } else {
+                    openFile(file,fileType)
                 }
-
-
             }
+
             itemView.setOnLongClickListener {
+                val position = adapterPosition
+                if (position == RecyclerView.NO_POSITION) return@setOnLongClickListener false
 
-                val fileUri = FileManager.FileManager().getContentUriImage(context, file, fileType)
-                if (fileUri == null) {
-                    Toast.makeText(context, "Unable to access file: $file", Toast.LENGTH_SHORT)
-                        .show()
-
-                    return@setOnLongClickListener true
-
+                if (!isSelectionMode) {
+                    enterSelectionMode()
+                    toggleSelection(position)
                 }
-                fileName = FileManager.FileName(context).getFileNameFromUri(fileUri)?.toString()
-                    ?: "Unknown File"
+                true
+            }
+        }
 
-                DialogUtil(context).showMaterialDialogWithNaturalButton(
-                    "$fileTypes DETAILS",
-                    "File Name: $fileName\n\nFile Path: $file\n\nYou can permanently delete or unhide this file.",
-                    "Delete Permanently",
-                    "Unhide",
-                    "Cancel",
-                    object : DialogActionsCallback {
-                        override fun onPositiveButtonClicked() {
-                            lifecycleOwner.lifecycleScope.launch {
-                                FileManager(context, lifecycleOwner).deletePhotoFromExternalStorage(
-                                    fileUri
+
+        private fun toggleSelection(position: Int) {
+            if (selectedItems.contains(position)) {
+                selectedItems.remove(position)
+                if (selectedItems.isEmpty()) {
+                    exitSelectionMode()
+                }
+            } else {
+                selectedItems.add(position)
+            }
+            onSelectionCountChanged(selectedItems.size)
+            notifyItemChanged(position)
+        }
+
+        private fun performDecryptionWithType(file: File, fileType: FileManager.FileType) {
+            lifecycleOwner.lifecycleScope.launch {
+                try {
+                    val extension = when (fileType) {
+                        FileManager.FileType.IMAGE -> ".jpg"
+                        FileManager.FileType.VIDEO -> ".mp4"
+                        FileManager.FileType.AUDIO -> ".mp3"
+                        else -> ".txt"
+                    }
+
+                    val decryptedFile = SecurityUtils.changeFileExtension(file, extension)
+                    if (SecurityUtils.decryptFile(context, file, decryptedFile)) {
+                        if (decryptedFile.exists() && decryptedFile.length() > 0) {
+                            hiddenFileRepository.insertHiddenFile(
+                                HiddenFileEntity(
+                                    filePath = decryptedFile.absolutePath,
+                                    fileName = decryptedFile.name,
+                                    encryptedFileName = file.name,
+                                    fileType = fileType,
+                                    originalExtension = extension,
+                                    isEncrypted = false
                                 )
+                            )
+
+                            when (fileType) {
+                                FileManager.FileType.IMAGE, FileManager.FileType.VIDEO -> {
+                                    val intent = Intent(context, PreviewActivity::class.java).apply {
+                                        putExtra("type", if (fileType == FileManager.FileType.IMAGE) "image" else "video")
+                                        putExtra("folder", currentFolder.toString())
+                                        putExtra("position", adapterPosition)
+                                        putExtra("isEncrypted", false)
+                                        putExtra("file", decryptedFile.absolutePath)
+                                    }
+                                    context.startActivity(intent)
+                                }
+                                FileManager.FileType.AUDIO -> openAudioFile(decryptedFile)
+                                else -> openDocumentFile(decryptedFile)
+                            }
+
+                            file.delete()
+                        } else {
+                            decryptedFile.delete()
+                            mainHandler.post {
+                                Toast.makeText(context, "Failed to decrypt file", Toast.LENGTH_SHORT).show()
                             }
-                            val currentList = currentList.toMutableList()
-                            currentList.remove(file)
-                            submitList(currentList)
                         }
-
-                        override fun onNegativeButtonClicked() {
-                            FileManager(context, lifecycleOwner).copyFileToNormalDir(fileUri)
-                            val currentList = currentList.toMutableList()
-                            currentList.remove(file)
-                            submitList(currentList)
+                    } else {
+                        if (decryptedFile.exists()) {
+                            decryptedFile.delete()
                         }
-
-                        override fun onNaturalButtonClicked() {
-
+                        mainHandler.post {
+                            Toast.makeText(context, "Failed to decrypt file", Toast.LENGTH_SHORT).show()
                         }
                     }
-                )
-
-                return@setOnLongClickListener true
+                } catch (_: Exception) {
+                    mainHandler.post {
+                        Toast.makeText(context, "Error decrypting file", Toast.LENGTH_SHORT).show()
+                    }
+                }
             }
+        }
+    }
 
+    fun isInSelectionMode(): Boolean = isSelectionMode
 
+    fun onBackPressed(): Boolean {
+        return if (isSelectionMode) {
+            exitSelectionMode()
+            true
+        } else {
+            false
         }
     }
 
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FileViewHolder {
-        val view = LayoutInflater.from(parent.context)
-            .inflate(R.layout.item_file, parent, false)
-        return FileViewHolder(view)
+    private fun onSelectionCountChanged(count: Int) {
+        filesOperationCallback?.get()?.onSelectionCountChanged(count)
     }
 
-    override fun onBindViewHolder(holder: FileViewHolder, position: Int) {
-        holder.bind(getItem(position))
-    }
-
-    class FileDiffCallback : DiffUtil.ItemCallback<File>() {
-        override fun areItemsTheSame(oldItem: File, newItem: File): Boolean {
-            return oldItem.path == newItem.path
-        }
-
-        override fun areContentsTheSame(oldItem: File, newItem: File): Boolean {
-            return oldItem == newItem
+    fun enterSelectionMode() {
+        if (!isSelectionMode) {
+            isSelectionMode = true
+            notifySelectionModeChange()
         }
     }
 
+    @SuppressLint("NotifyDataSetChanged")
+    fun exitSelectionMode() {
+        if (isSelectionMode) {
+            isSelectionMode = false
+            selectedItems.forEach { position ->
+                notifyItemChanged(position)
+            }
+            selectedItems.clear()
+            notifySelectionModeChange()
+        }
+    }
 
-}
+    private fun notifySelectionModeChange() {
+        filesOperationCallback?.get()?.onSelectionModeChanged(isSelectionMode, selectedItems.size)
+        onFolderLongClick(isSelectionMode)
+    }
+
+    fun cleanup() {
+        try {
+            if (!fileExecutor.isShutdown) {
+                fileExecutor.shutdown()
+            }
+        } catch (_: Exception) {
+        }
+
+        filesOperationCallback?.clear()
+        filesOperationCallback = null
+    }
+
+    fun getSelectedItems(): List<File> {
+        return selectedItems.mapNotNull { position ->
+            if (position < itemCount) getItem(position) else null
+        }
+    }
+
+    fun encryptSelectedFiles() {
+        val selectedFiles = getSelectedItems()
+        if (selectedFiles.isEmpty()) return
+
+        MaterialAlertDialogBuilder(context)
+            .setTitle(context.getString(R.string.encrypt_files))
+            .setMessage(context.getString(R.string.encryption_disclaimer))
+            .setPositiveButton(context.getString(R.string.encrypt)) { _, _ ->
+                FileManager(context, lifecycleOwner).performEncryption(
+                    selectedFiles
+                ) {
+                    updateItemsAfterEncryption(it)
+                }
+            }
+            .setNegativeButton(context.getString(R.string.cancel), null)
+            .show()
+    }
+
+    fun decryptSelectedFiles() {
+        val selectedFiles = getSelectedItems()
+        if (selectedFiles.isEmpty()) return
+
+        MaterialAlertDialogBuilder(context)
+            .setTitle(context.getString(R.string.decrypt_files))
+            .setMessage(context.getString(R.string.decryption_disclaimer))
+            .setPositiveButton(context.getString(R.string.decrypt)) { _, _ ->
+                FileManager(context, lifecycleOwner).performDecryption(selectedFiles) {
+                    updateItemsAfterDecryption(it)
+                }
+            }
+            .setNegativeButton(context.getString(R.string.cancel), null)
+            .show()
+    }
+
+    fun updateItemsAfterEncryption(encryptedFiles: Map<File, File>) {
+
+        val currentList = FolderManager().getFilesInFolder(currentFolder)
+        val updatedList = currentList.map { file ->
+            encryptedFiles[file] ?: file
+        }.toMutableList()
+        selectedItems.clear()
+        exitSelectionMode()
+        submitList(updatedList)
+        mainHandler.postDelayed({
+
+            filesOperationCallback?.get()?.onRefreshNeeded()
+        },20)
+    }
+
+    fun updateItemsAfterDecryption(decryptedFiles: Map<File, File>) {
+        val currentList = FolderManager().getFilesInFolder(currentFolder)
+        val updatedList = currentList.map { file ->
+            decryptedFiles[file] ?: file
+        }.toMutableList()
+        selectedItems.clear()
+        exitSelectionMode()
+        submitList(updatedList)
+        mainHandler.postDelayed({
+
+            filesOperationCallback?.get()?.onRefreshNeeded()
+        },20)
+    }
+}

app/src/main/java/devs/org/calculator/adapters/FileDiffCallback.kt

@@ -0,0 +1,46 @@
+package devs.org.calculator.adapters
+
+import androidx.recyclerview.widget.DiffUtil
+import java.io.File
+
+class FileDiffCallback : DiffUtil.ItemCallback<File>() {
+
+    override fun areItemsTheSame(oldItem: File, newItem: File): Boolean {
+        return oldItem.absolutePath == newItem.absolutePath
+    }
+
+    override fun areContentsTheSame(oldItem: File, newItem: File): Boolean {
+        return oldItem.name == newItem.name &&
+                oldItem.length() == newItem.length() &&
+                oldItem.lastModified() == newItem.lastModified() &&
+                oldItem.canRead() == newItem.canRead() &&
+                oldItem.canWrite() == newItem.canWrite() &&
+                oldItem.exists() == newItem.exists()
+    }
+
+    override fun getChangePayload(oldItem: File, newItem: File): Any? {
+        val changes = mutableListOf<String>()
+
+        if (oldItem.name != newItem.name) {
+            changes.add("NAME_CHANGED")
+        }
+
+        if (oldItem.length() != newItem.length()) {
+            changes.add("SIZE_CHANGED")
+        }
+
+        if (oldItem.lastModified() != newItem.lastModified()) {
+            changes.add("MODIFIED_DATE_CHANGED")
+        }
+
+        if (oldItem.exists() != newItem.exists()) {
+            changes.add("EXISTENCE_CHANGED")
+        }
+
+        if (oldItem.absolutePath != newItem.absolutePath) {
+            changes.add("FILE_CHANGED")
+        }
+
+        return changes.ifEmpty { null }
+    }
+}

app/src/main/java/devs/org/calculator/adapters/FolderAdapter.kt

@@ -0,0 +1,127 @@
+package devs.org.calculator.adapters
+
+import android.annotation.SuppressLint
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import devs.org.calculator.R
+import java.io.File
+
+class FolderAdapter(
+    private val onFolderClick: (File) -> Unit,
+    private val onFolderLongClick: (File) -> Unit,
+    private val onSelectionModeChanged: (Boolean) -> Unit,
+    private val onSelectionCountChanged: (Int) -> Unit
+) : ListAdapter<File, FolderAdapter.FolderViewHolder>(FolderDiffCallback()) {
+
+    private val selectedItems = mutableSetOf<Int>()
+    private var isSelectionMode = false
+
+    inner class FolderViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        val folderNameTextView: TextView = itemView.findViewById(R.id.folderName)
+        val selectedView: ImageView = itemView.findViewById(R.id.selected)
+        val selectedLayer: View = itemView.findViewById(R.id.selectedLayer)
+
+        fun bind(folder: File, onFolderClick: (File) -> Unit, onFolderLongClick: (File) -> Unit, isSelected: Boolean) {
+            folderNameTextView.text = folder.name
+
+            selectedView.visibility = if (isSelected) View.VISIBLE else View.GONE
+            selectedLayer.visibility = if (isSelected) View.VISIBLE else View.GONE
+
+            itemView.setOnClickListener { 
+                if (isSelectionMode) {
+                    toggleSelection(adapterPosition)
+                } else {
+                    onFolderClick(folder)
+                }
+            }
+            
+            itemView.setOnLongClickListener {
+                if (!isSelectionMode) {
+                    enterSelectionMode()
+                    onFolderLongClick(folder)
+                    toggleSelection(adapterPosition)
+                }
+                true
+            }
+        }
+
+        private fun toggleSelection(position: Int) {
+            if (selectedItems.contains(position)) {
+                selectedItems.remove(position)
+                if (selectedItems.isEmpty()) {
+                    exitSelectionMode()
+                }
+            } else {
+                selectedItems.add(position)
+            }
+            onSelectionCountChanged(selectedItems.size)
+            notifyItemChanged(position)
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FolderViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_folder, parent, false)
+        return FolderViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: FolderViewHolder, position: Int) {
+        val folder = getItem(position)
+        holder.bind(folder, onFolderClick, onFolderLongClick, selectedItems.contains(position))
+    }
+
+    fun getSelectedItems(): List<File> {
+        return selectedItems.mapNotNull { position ->
+            if (position < itemCount) getItem(position) else null
+        }
+    }
+
+    @SuppressLint("NotifyDataSetChanged")
+    fun clearSelection() {
+        val wasInSelectionMode = isSelectionMode
+        selectedItems.clear()
+        if (wasInSelectionMode) {
+            exitSelectionMode()
+        }
+        onSelectionCountChanged(0)
+        notifyDataSetChanged()
+    }
+
+    fun onBackPressed(): Boolean {
+        return if (isInSelectionMode()) {
+            clearSelection()
+            true
+        } else {
+            false
+        }
+    }
+
+    fun isInSelectionMode(): Boolean {
+        return isSelectionMode
+    }
+
+    private fun enterSelectionMode() {
+        isSelectionMode = true
+        onSelectionModeChanged(true)
+    }
+
+    private fun exitSelectionMode() {
+        isSelectionMode = false
+        onSelectionModeChanged(false)
+    }
+
+    private class FolderDiffCallback : DiffUtil.ItemCallback<File>() {
+        override fun areItemsTheSame(oldItem: File, newItem: File): Boolean {
+            return oldItem.absolutePath == newItem.absolutePath
+        }
+
+        override fun areContentsTheSame(oldItem: File, newItem: File): Boolean {
+            return oldItem.name == newItem.name
+        }
+    }
+}

app/src/main/java/devs/org/calculator/adapters/FolderSelectionAdapter.kt

@@ -0,0 +1,41 @@
+package devs.org.calculator.adapters
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import devs.org.calculator.R
+import java.io.File
+
+class FolderSelectionAdapter(
+    private val folders: List<File>,
+    private val onFolderSelected: (File) -> Unit
+) : RecyclerView.Adapter<FolderSelectionAdapter.FolderViewHolder>() {
+
+    inner class FolderViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val folderName: TextView = view.findViewById(R.id.folderName)
+
+        init {
+            view.setOnClickListener {
+                val position = adapterPosition
+                if (position != RecyclerView.NO_POSITION) {
+                    onFolderSelected(folders[position])
+                }
+            }
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FolderViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_folder_selection, parent, false)
+        return FolderViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: FolderViewHolder, position: Int) {
+        val folder = folders[position]
+        holder.folderName.text = folder.name
+    }
+
+    override fun getItemCount() = folders.size
+} 

app/src/main/java/devs/org/calculator/adapters/ImagePreviewAdapter.kt

@@ -5,31 +5,37 @@ import android.media.MediaPlayer
 import android.net.Uri
 import android.os.Handler
 import android.os.Looper
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.MediaController
-import android.widget.SeekBar
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.AsyncListDiffer
 import androidx.recyclerview.widget.RecyclerView
 import com.bumptech.glide.Glide
-import devs.org.calculator.adapters.FileAdapter.FileDiffCallback
+import devs.org.calculator.R
+import devs.org.calculator.database.AppDatabase
+import devs.org.calculator.database.HiddenFileRepository
 import devs.org.calculator.databinding.ViewpagerItemsBinding
 import devs.org.calculator.utils.FileManager
+import devs.org.calculator.utils.SecurityUtils.getDecryptedPreviewFile
+import devs.org.calculator.utils.SecurityUtils.getUriForPreviewFile
+import kotlinx.coroutines.launch
 import java.io.File
-import devs.org.calculator.R
 
 class ImagePreviewAdapter(
     private val context: Context,
-    private var fileType: FileManager.FileType
+    private var lifecycleOwner: LifecycleOwner
 ) : RecyclerView.Adapter<ImagePreviewAdapter.ImageViewHolder>() {
 
     private val differ = AsyncListDiffer(this, FileDiffCallback())
-    var currentMediaPlayer: MediaPlayer? = null
-    var isMediaPlayerPrepared = false
-    var currentViewHolder: ImageViewHolder? = null
     private var currentPlayingPosition = -1
-    private var isPlaying = false
+    private var currentViewHolder: ImageViewHolder? = null
+    private val hiddenFileRepository: HiddenFileRepository by lazy {
+        HiddenFileRepository(AppDatabase.getDatabase(context).hiddenFileDao())
+    }
 
     var images: List<File>
         get() = differ.currentList
@@ -42,122 +48,233 @@ class ImagePreviewAdapter(
 
     override fun onBindViewHolder(holder: ImageViewHolder, position: Int) {
         val imageUrl = images[position]
-        holder.bind(imageUrl)
-        currentViewHolder = holder
+        val fileType = FileManager(context,lifecycleOwner).getFileType(imageUrl)
+        stopAndResetCurrentAudio()
 
-        currentMediaPlayer?.let {
-            if (it.isPlaying) it.pause()
-            it.seekTo(0)
-        }
-        currentMediaPlayer = null
-        isMediaPlayerPrepared = false
-
-        if (currentMediaPlayer?.isPlaying == true) {
-            currentMediaPlayer?.stop()
-            currentMediaPlayer?.release()
-        }
-        currentMediaPlayer = null
+        holder.bind(imageUrl, position,fileType)
     }
 
     override fun getItemCount(): Int = images.size
 
+    private fun stopAndResetCurrentAudio() {
+        currentViewHolder?.stopAndResetAudio()
+        currentPlayingPosition = -1
+        currentViewHolder = null
+    }
+
     inner class ImageViewHolder(private val binding: ViewpagerItemsBinding) : RecyclerView.ViewHolder(binding.root) {
 
-        private var mediaPlayer: MediaPlayer? = null
         private var seekHandler = Handler(Looper.getMainLooper())
         private var seekRunnable: Runnable? = null
+        private var mediaPlayer: MediaPlayer? = null
+        private var isMediaPlayerPrepared = false
+        private var isPlaying = false
+        private var currentPosition = 0
+        private var tempDecryptedFile: File? = null
 
-        fun bind(file: File) {
-            when (fileType) {
-                FileManager.FileType.VIDEO -> {
-                    binding.imageView.visibility = View.GONE
-                    binding.audioBg.visibility = View.GONE
-                    binding.videoView.visibility = View.VISIBLE
+        fun bind(file: File, position: Int, decryptedFileType: FileManager.FileType) {
+            currentPosition = position
 
-                    val videoUri = Uri.fromFile(file)
-                    binding.videoView.setVideoURI(videoUri)
-                    binding.videoView.start()
-
-                    val mediaController = MediaController(context)
-                    mediaController.setAnchorView(binding.videoView)
-                    binding.videoView.setMediaController(mediaController)
-
-                    mediaController.setPrevNextListeners(
-                        {
-                            val nextPosition = (adapterPosition + 1) % images.size
-                            playVideoAtPosition(nextPosition)
-                        },
-                        {
-                            val prevPosition = if (adapterPosition - 1 < 0) images.size - 1 else adapterPosition - 1
-                            playVideoAtPosition(prevPosition)
+            releaseMediaPlayer()
+            resetAudioUI()
+            cleanupTempFile()
+            
+            try {
+                lifecycleOwner.lifecycleScope.launch {
+                    val hiddenFile = hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                    if (hiddenFile != null) {
+                        val isEncrypted = hiddenFile.isEncrypted
+                        val fileType = hiddenFile.fileType
+                        if (isEncrypted) {
+                            tempDecryptedFile = getDecryptedPreviewFile(context, hiddenFile)
+                            if (tempDecryptedFile != null && tempDecryptedFile!!.exists() && tempDecryptedFile!!.length() > 0) {
+                                displayFile(tempDecryptedFile!!, fileType, true)
+                            } else {
+                                Log.e("ImagePreviewAdapter", "Failed to get decrypted preview file for: ${file.absolutePath}")
+                                showEncryptedError()
+                            }
+                        } else {
+                            displayFile(file, decryptedFileType, false)
                         }
-                    )
-
-                    binding.videoView.setOnCompletionListener {
-                        val nextPosition = (adapterPosition + 1) % images.size
-                        playVideoAtPosition(nextPosition)
+                    } else {
+                        displayFile(file, decryptedFileType, false)
                     }
                 }
-                FileManager.FileType.IMAGE -> {
-                    binding.imageView.visibility = View.VISIBLE
-                    binding.videoView.visibility = View.GONE
-                    binding.audioBg.visibility = View.GONE
-                    Glide.with(context)
-                        .load(file)
-                        .into(binding.imageView)
-                }
-                FileManager.FileType.AUDIO -> {
-                    binding.imageView.visibility = View.GONE
-                    binding.audioBg.visibility = View.VISIBLE
-                    binding.videoView.visibility = View.GONE
-                    binding.audioTitle.text = file.name
-
-                    setupAudioPlayer(file)
-                    setupSeekBar()
-                    setupPlaybackControls()
-                }
-                else -> {
-                    binding.imageView.visibility = View.VISIBLE
-                    binding.audioBg.visibility = View.GONE
-                    binding.videoView.visibility = View.GONE
-                }
+            } catch (e: Exception) {
+                Log.e("ImagePreviewAdapter", "Error in bind: ${e.message}")
+                displayFile(file, decryptedFileType, false)
             }
         }
 
+        private fun displayFile(file: File, fileType: FileManager.FileType, isEncrypted: Boolean = false) {
+            try {
+                val uri = if (isEncrypted) {
+                    getUriForPreviewFile(context, file)
+                } else {
+                    Uri.fromFile(file)
+                }
+
+                if (uri == null) {
+                    Log.e("ImagePreviewAdapter", "Failed to get URI for file: ${file.absolutePath}")
+                    showEncryptedError()
+                    return
+                }
+
+                when (fileType) {
+                    FileManager.FileType.VIDEO -> {
+                        binding.imageView.visibility = View.GONE
+                        binding.audioBg.visibility = View.GONE
+                        binding.videoView.visibility = View.VISIBLE
+
+                        binding.videoView.setVideoURI(uri)
+                        binding.videoView.start()
+
+                        val mediaController = MediaController(context)
+                        mediaController.setAnchorView(binding.videoView)
+                        binding.videoView.setMediaController(mediaController)
+
+                        mediaController.setPrevNextListeners(
+                            {
+                                val nextPosition = (adapterPosition + 1) % images.size
+                                playVideoAtPosition(nextPosition)
+                            },
+                            {
+                                val prevPosition = if (adapterPosition - 1 < 0) images.size - 1 else adapterPosition - 1
+                                playVideoAtPosition(prevPosition)
+                            }
+                        )
+
+                        binding.videoView.setOnCompletionListener {
+                            val nextPosition = (adapterPosition + 1) % images.size
+                            playVideoAtPosition(nextPosition)
+                        }
+                    }
+                    FileManager.FileType.IMAGE -> {
+                        binding.imageView.visibility = View.VISIBLE
+                        binding.videoView.visibility = View.GONE
+                        binding.audioBg.visibility = View.GONE
+                        Glide.with(context)
+                            .load(uri)
+                            .error(R.drawable.encrypted)
+                            .into(binding.imageView)
+                    }
+                    FileManager.FileType.AUDIO -> {
+                        val audioFile: File? = if (isEncrypted) {
+                            getFileFromUri(context, uri)
+                        } else {
+                            file
+                        }
+                        if (audioFile == null) {
+                            Log.e("ImagePreviewAdapter", "Failed to get audio file from URI")
+                            showEncryptedError()
+                            return
+                        }
+                        binding.imageView.visibility = View.GONE
+                        binding.audioBg.visibility = View.VISIBLE
+                        binding.videoView.visibility = View.GONE
+                        binding.audioTitle.text = file.name
+
+                        setupAudioPlayer(audioFile)
+                        setupPlaybackControls()
+                    }
+                    else -> {
+                        binding.imageView.visibility = View.VISIBLE
+                        binding.audioBg.visibility = View.GONE
+                        binding.videoView.visibility = View.GONE
+                        Glide.with(context)
+                            .load(uri)
+                            .error(R.drawable.encrypted)
+                            .into(binding.imageView)
+                    }
+                }
+            } catch (e: Exception) {
+                Log.e("ImagePreviewAdapter", "Error displaying file: ${e.message}")
+                showEncryptedError()
+            }
+        }
+
+        fun getFileFromUri(context: Context, uri: Uri): File? {
+            return try {
+                val inputStream = context.contentResolver.openInputStream(uri)
+                val tempFile = File.createTempFile("temp_audio", null, context.cacheDir)
+                tempFile.outputStream().use { output ->
+                    inputStream?.copyTo(output)
+                }
+                tempFile
+            } catch (e: Exception) {
+                e.printStackTrace()
+                null
+            }
+        }
+
+        private fun showEncryptedError() {
+            binding.imageView.visibility = View.VISIBLE
+            binding.videoView.visibility = View.GONE
+            binding.audioBg.visibility = View.GONE
+            binding.imageView.setImageResource(R.drawable.encrypted)
+        }
+
+        private fun cleanupTempFile() {
+            tempDecryptedFile?.let {
+                if (it.exists()) {
+                    try {
+                        it.delete()
+                    } catch (e: Exception) {
+                        Log.e("ImagePreviewAdapter", "Error cleaning up temp file: ${e.message}")
+                    }
+                }
+                tempDecryptedFile = null
+            }
+        }
+
+        private fun resetAudioUI() {
+            binding.playPause.setImageResource(R.drawable.play)
+            binding.audioSeekBar.value = 0f
+            binding.audioSeekBar.valueTo = 100f
+            seekRunnable?.let { seekHandler.removeCallbacks(it) }
+        }
+
         private fun setupAudioPlayer(file: File) {
-            mediaPlayer = MediaPlayer().apply {
-                setDataSource(file.absolutePath)
-                setOnPreparedListener { mp ->
-                    binding.audioSeekBar.max = mp.duration
-                    isMediaPlayerPrepared = true
+            try {
+                mediaPlayer = MediaPlayer().apply {
+                    setDataSource(file.absolutePath)
+                    setOnPreparedListener { mp ->
+                        binding.audioSeekBar.valueTo = mp.duration.toFloat()
+                        binding.audioSeekBar.value = 0f
+                        setupSeekBar()
+                        isMediaPlayerPrepared = true
+                    }
+                    setOnCompletionListener {
+                        stopAndResetAudio()
+                    }
+                    setOnErrorListener { _, _, _ ->
+                        releaseMediaPlayer()
+                        true
+                    }
+                    prepareAsync()
                 }
-                setOnCompletionListener {
-//                    isPlaying = false
-                    binding.playPause.setImageResource(R.drawable.play)
-                    binding.audioSeekBar.progress = 0
-                    seekHandler.removeCallbacks(seekRunnable!!)
-                }
-                prepareAsync()
+            } catch (e: Exception) {
+                e.printStackTrace()
+                releaseMediaPlayer()
             }
         }
 
         private fun setupSeekBar() {
-            binding.audioSeekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
-                override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
-                    if (fromUser) {
-                        mediaPlayer?.seekTo(progress)
-                    }
+            binding.audioSeekBar.addOnChangeListener { _, value, fromUser ->
+                if (fromUser && mediaPlayer != null && isMediaPlayerPrepared) {
+                    mediaPlayer?.seekTo(value.toInt())
                 }
-
-                override fun onStartTrackingTouch(seekBar: SeekBar?) {}
-                override fun onStopTrackingTouch(seekBar: SeekBar?) {}
-            })
+            }
 
             seekRunnable = Runnable {
                 mediaPlayer?.let { mp ->
-                    if (mp.isPlaying) {
-                        binding.audioSeekBar.progress = mp.currentPosition
-                        seekHandler.postDelayed(seekRunnable!!, 100)
+                    if (mp.isPlaying && isMediaPlayerPrepared) {
+                        try {
+                            binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                            seekHandler.postDelayed(seekRunnable!!, 100)
+                        } catch (e: Exception) {
+                            e.printStackTrace()
+                        }
                     }
                 }
             }
@@ -174,64 +291,127 @@ class ImagePreviewAdapter(
 
             binding.preview.setOnClickListener {
                 mediaPlayer?.let { mp ->
-                    val newPosition = mp.currentPosition - 10000
-                    mp.seekTo(maxOf(0, newPosition))
-                    binding.audioSeekBar.progress = mp.currentPosition
+                    if (isMediaPlayerPrepared) {
+                        try {
+                            val newPosition = mp.currentPosition - 10000
+                            mp.seekTo(maxOf(0, newPosition))
+                            binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                        } catch (e: Exception) {
+                            e.printStackTrace()
+                        }
+                    }
                 }
             }
 
             binding.next.setOnClickListener {
                 mediaPlayer?.let { mp ->
-                    val newPosition = mp.currentPosition + 10000
-                    mp.seekTo(minOf(mp.duration, newPosition))
-                    binding.audioSeekBar.progress = mp.currentPosition
+                    if (isMediaPlayerPrepared) {
+                        try {
+                            val newPosition = mp.currentPosition + 10000
+                            mp.seekTo(minOf(mp.duration, newPosition))
+                            binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                        } catch (e: Exception) {
+                            e.printStackTrace()
+                        }
+                    }
                 }
             }
         }
 
         private fun playAudio() {
             mediaPlayer?.let { mp ->
-                if (currentPlayingPosition != -1 && currentPlayingPosition != adapterPosition) {
-                    currentViewHolder?.pauseAudio()
+                if (isMediaPlayerPrepared) {
+                    try {
+                        if (currentPlayingPosition != currentPosition) {
+                            stopAndResetCurrentAudio()
+                        }
+
+                        mp.start()
+                        isPlaying = true
+                        binding.playPause.setImageResource(R.drawable.pause)
+                        seekRunnable?.let { seekHandler.post(it) }
+
+                        currentPlayingPosition = currentPosition
+                        currentViewHolder = this@ImageViewHolder
+                    } catch (e: Exception) {
+                        e.printStackTrace()
+                        releaseMediaPlayer()
+                    }
                 }
-                mp.start()
-                isPlaying = true
-                binding.playPause.setImageResource(R.drawable.pause)
-                seekHandler.post(seekRunnable!!)
-                currentPlayingPosition = adapterPosition
-                currentViewHolder = this
             }
         }
 
         private fun pauseAudio() {
             mediaPlayer?.let { mp ->
-                if (mp.isPlaying) {
-                    mp.pause()
-                    isPlaying = false
-                    binding.playPause.setImageResource(R.drawable.play)
-                    seekHandler.removeCallbacks(seekRunnable!!)
+                try {
+                    if (mp.isPlaying) {
+                        mp.pause()
+                        isPlaying = false
+                        binding.playPause.setImageResource(R.drawable.play)
+                        seekRunnable?.let { seekHandler.removeCallbacks(it) }
+                    }
+                } catch (e: Exception) {
+                    e.printStackTrace()
+                    releaseMediaPlayer()
                 }
             }
         }
 
+        fun stopAndResetAudio() {
+            try {
+                mediaPlayer?.let { mp ->
+                    if (mp.isPlaying) {
+                        mp.stop()
+                        mp.prepare()
+                    } else if (isMediaPlayerPrepared) {
+                        mp.seekTo(0)
+                    }
+                }
+                isPlaying = false
+                resetAudioUI()
+
+                if (currentPlayingPosition == currentPosition) {
+                    currentPlayingPosition = -1
+                    currentViewHolder = null
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+                releaseMediaPlayer()
+            }
+        }
+
         fun releaseMediaPlayer() {
-            mediaPlayer?.let { mp ->
-                if (mp.isPlaying) {
-                    mp.stop()
+            try {
+                mediaPlayer?.let { mp ->
+                    if (mp.isPlaying) {
+                        mp.stop()
+                    }
+                    mp.release()
                 }
-                mp.release()
+            } catch (e: Exception) {
+                e.printStackTrace()
+            } finally {
                 mediaPlayer = null
                 isPlaying = false
-                seekHandler.removeCallbacks(seekRunnable!!)
+                isMediaPlayerPrepared = false
+                seekRunnable?.let { seekHandler.removeCallbacks(it) }
+
+                if (currentPlayingPosition == currentPosition) {
+                    currentPlayingPosition = -1
+                    currentViewHolder = null
+                }
             }
         }
 
         private fun playVideoAtPosition(position: Int) {
-            val nextFile = images[position]
-            if (fileType == FileManager.FileType.VIDEO) {
-                val videoUri = Uri.fromFile(nextFile)
-                binding.videoView.setVideoURI(videoUri)
-                binding.videoView.start()
+            if (position < images.size) {
+                val nextFile = images[position]
+                val fileType = FileManager(context, lifecycleOwner).getFileType(images[position])
+                if (fileType == FileManager.FileType.VIDEO) {
+                    val videoUri = Uri.fromFile(nextFile)
+                    binding.videoView.setVideoURI(videoUri)
+                    binding.videoView.start()
+                }
             }
         }
     }
@@ -240,5 +420,14 @@ class ImagePreviewAdapter(
         super.onViewRecycled(holder)
         holder.releaseMediaPlayer()
     }
-}
 
+    fun onItemScrolledAway(position: Int) {
+        if (currentPlayingPosition == position) {
+            stopAndResetCurrentAudio()
+        }
+    }
+
+    fun releaseAllResources() {
+        stopAndResetCurrentAudio()
+    }
+}

app/src/main/java/devs/org/calculator/adapters/ListFolderAdapter.kt

@@ -0,0 +1,125 @@
+package devs.org.calculator.adapters
+
+import android.annotation.SuppressLint
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import devs.org.calculator.R
+import java.io.File
+
+class ListFolderAdapter(
+    private val onFolderClick: (File) -> Unit,
+    private val onFolderLongClick: (File) -> Unit,
+    private val onSelectionModeChanged: (Boolean) -> Unit,
+    private val onSelectionCountChanged: (Int) -> Unit
+) : ListAdapter<File, ListFolderAdapter.FolderViewHolder>(FolderDiffCallback()) {
+
+    private val selectedItems = mutableSetOf<Int>()
+    private var isSelectionMode = false
+
+    inner class FolderViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val folderNameTextView: TextView = itemView.findViewById(R.id.folderName)
+
+        private val selectedLayer: View = itemView.findViewById(R.id.selectedLayer)
+
+        fun bind(folder: File, onFolderClick: (File) -> Unit, onFolderLongClick: (File) -> Unit, isSelected: Boolean) {
+            folderNameTextView.text = folder.name
+
+            selectedLayer.visibility = if (isSelected) View.VISIBLE else View.GONE
+
+            itemView.setOnClickListener { 
+                if (isSelectionMode) {
+                    toggleSelection(adapterPosition)
+                } else {
+                    onFolderClick(folder)
+                }
+            }
+            
+            itemView.setOnLongClickListener {
+                if (!isSelectionMode) {
+                    enterSelectionMode()
+                    onFolderLongClick(folder)
+                    toggleSelection(adapterPosition)
+                }
+                true
+            }
+        }
+
+        private fun toggleSelection(position: Int) {
+            if (selectedItems.contains(position)) {
+                selectedItems.remove(position)
+                if (selectedItems.isEmpty()) {
+                    exitSelectionMode()
+                }
+            } else {
+                selectedItems.add(position)
+            }
+            onSelectionCountChanged(selectedItems.size)
+            notifyItemChanged(position)
+        }
+    }
+
+    private fun enterSelectionMode() {
+        isSelectionMode = true
+        onSelectionModeChanged(true)
+    }
+
+    private fun exitSelectionMode() {
+        isSelectionMode = false
+        onSelectionModeChanged(false)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): FolderViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_folder_list_style, parent, false)
+        return FolderViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: FolderViewHolder, position: Int) {
+        val folder = getItem(position)
+        holder.bind(folder, onFolderClick, onFolderLongClick, selectedItems.contains(position))
+    }
+
+    fun getSelectedItems(): List<File> {
+        return selectedItems.mapNotNull { position ->
+            if (position < itemCount) getItem(position) else null
+        }
+    }
+
+    @SuppressLint("NotifyDataSetChanged")
+    fun clearSelection() {
+        val wasInSelectionMode = isSelectionMode
+        selectedItems.clear()
+        if (wasInSelectionMode) {
+            exitSelectionMode()
+        }
+        onSelectionCountChanged(0)
+        notifyDataSetChanged()
+    }
+
+    fun onBackPressed(): Boolean {
+        return if (isInSelectionMode()) {
+            clearSelection()
+            true
+        } else {
+            false
+        }
+    }
+
+    fun isInSelectionMode(): Boolean {
+        return isSelectionMode
+    }
+
+    private class FolderDiffCallback : DiffUtil.ItemCallback<File>() {
+        override fun areItemsTheSame(oldItem: File, newItem: File): Boolean {
+            return oldItem.absolutePath == newItem.absolutePath
+        }
+
+        override fun areContentsTheSame(oldItem: File, newItem: File): Boolean {
+            return oldItem.name == newItem.name
+        }
+    }
+}

app/src/main/java/devs/org/calculator/database/AppDatabase.kt

@@ -0,0 +1,28 @@
+package devs.org.calculator.database
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [HiddenFileEntity::class], version = 1)
+abstract class AppDatabase : RoomDatabase() {
+    abstract fun hiddenFileDao(): HiddenFileDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: AppDatabase? = null
+
+        fun getDatabase(context: Context): AppDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    AppDatabase::class.java,
+                    "calculator_database"
+                ).build()
+                INSTANCE = instance
+                instance
+            }
+        }
+    }
+} 

app/src/main/java/devs/org/calculator/database/HiddenFileDao.kt

@@ -0,0 +1,33 @@
+package devs.org.calculator.database
+
+import androidx.room.*
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface HiddenFileDao {
+    @Query("SELECT * FROM hidden_files")
+    fun getAllHiddenFiles(): Flow<List<HiddenFileEntity>>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertHiddenFile(hiddenFile: HiddenFileEntity)
+
+    @Delete
+    suspend fun deleteHiddenFile(hiddenFile: HiddenFileEntity)
+
+    @Query("SELECT * FROM hidden_files WHERE filePath = :filePath")
+    suspend fun getHiddenFileByPath(filePath: String): HiddenFileEntity?
+
+    @Query("SELECT * FROM hidden_files WHERE fileName = :fileName")
+    suspend fun getHiddenFileByOriginalName(fileName: String): HiddenFileEntity?
+
+    @Query("UPDATE hidden_files SET isEncrypted = :isEncrypted, filePath = :newFilePath, encryptedFileName = :encryptedFileName WHERE filePath = :filePath")
+    suspend fun updateEncryptionStatus(
+        filePath: String,
+        newFilePath: String,
+        encryptedFileName: String?,
+        isEncrypted: Boolean
+    )
+
+    @Update
+    suspend fun updateHiddenFile(hiddenFile: HiddenFileEntity)
+} 

app/src/main/java/devs/org/calculator/database/HiddenFileEntity.kt

@@ -0,0 +1,17 @@
+package devs.org.calculator.database
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+import devs.org.calculator.utils.FileManager
+
+@Entity(tableName = "hidden_files")
+data class HiddenFileEntity(
+    @PrimaryKey
+    val filePath: String, //absolute path of the file
+    val fileName: String,  // Original filename with extension
+    val encryptedFileName: String,  // Encrypted filename
+    val fileType: FileManager.FileType, //type of the file
+    val originalExtension: String, // original file extension
+    val isEncrypted: Boolean, // is the file encrypted or not
+    var dateAdded: Long = System.currentTimeMillis()
+)

app/src/main/java/devs/org/calculator/database/HiddenFileRepository.kt

@@ -0,0 +1,27 @@
+package devs.org.calculator.database
+
+import kotlinx.coroutines.flow.Flow
+
+class HiddenFileRepository(private val hiddenFileDao: HiddenFileDao) {
+
+    fun getAllHiddenFiles(): Flow<List<HiddenFileEntity>> {
+        return hiddenFileDao.getAllHiddenFiles()
+    }
+
+    suspend fun insertHiddenFile(hiddenFile: HiddenFileEntity) {
+        hiddenFileDao.insertHiddenFile(hiddenFile)
+    }
+
+    suspend fun deleteHiddenFile(hiddenFile: HiddenFileEntity) {
+        hiddenFileDao.deleteHiddenFile(hiddenFile)
+    }
+
+    suspend fun getHiddenFileByPath(filePath: String): HiddenFileEntity? {
+        return hiddenFileDao.getHiddenFileByPath(filePath)
+    }
+
+    suspend fun updateEncryptionStatus(filePath: String, newFilePath: String,encryptedFileName: String, isEncrypted: Boolean) {
+        hiddenFileDao.updateEncryptionStatus(filePath,newFilePath, encryptedFileName = encryptedFileName, isEncrypted)
+    }
+
+}

app/src/main/java/devs/org/calculator/utils/DialogUtil.kt

@@ -1,71 +1,57 @@
 package devs.org.calculator.utils
 
-import android.app.RecoverableSecurityException
 import android.content.Context
-import android.net.Uri
-import android.os.Build
-import android.provider.MediaStore
-import android.view.View
-import android.widget.Toast
-import androidx.activity.result.ActivityResultLauncher
-import androidx.activity.result.IntentSenderRequest
-import androidx.documentfile.provider.DocumentFile
-import androidx.lifecycle.LifecycleOwner
+import android.view.LayoutInflater
+import android.widget.EditText
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import com.google.android.material.textfield.TextInputEditText
 import devs.org.calculator.R
-import devs.org.calculator.callbacks.DialogActionsCallback
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
 
 class DialogUtil(private val context: Context) {
-    private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
-    fun showMaterialDialogWithNaturalButton(
-        title: String,
-        message: String,
-        positiveButton: String,
-        negativeButton: String,
-        neutralButton: String,
-        callback: DialogActionsCallback
-    ) {
-        MaterialAlertDialogBuilder(context)
-            .setTitle(title)
-            .setMessage(message)
-            .setPositiveButton(positiveButton) { dialog, _ ->
-                // Handle positive button click
-                callback.onPositiveButtonClicked()
-                dialog.dismiss()
-            }
-            .setNegativeButton(negativeButton) { dialog, _ ->
-                // Handle negative button click
-                callback.onNegativeButtonClicked()
-                dialog.dismiss()
-            }
-            .setNeutralButton(neutralButton) { dialog, _ ->
-                callback.onNaturalButtonClicked()
-                dialog.dismiss()
-            }
-            .show()
-    }
+
     fun showMaterialDialog(
         title: String,
         message: String,
-        positiveButton: String,
-        negativeButton: String,
-        callback: DialogActionsCallback
+        positiveButtonText: String,
+        neutralButtonText: String,
+        callback: DialogCallback
     ) {
         MaterialAlertDialogBuilder(context)
             .setTitle(title)
             .setMessage(message)
-            .setPositiveButton(positiveButton) { dialog, _ ->
-                // Handle positive button click
-                callback.onPositiveButtonClicked()
-            }
-            .setNegativeButton(negativeButton) { dialog, _ ->
-                // Handle negative button click
-                callback.onNegativeButtonClicked()
-                dialog.dismiss()
-            }
+            .setPositiveButton(positiveButtonText) { _, _ -> callback.onPositiveButtonClicked() }
+            .setNegativeButton(neutralButtonText) { _, _ -> callback.onNegativeButtonClicked() }
             .show()
     }
+
+    fun createInputDialog(
+        title: String,
+        hint: String,
+        callback: InputDialogCallback
+    ) {
+        val dialogView = LayoutInflater.from(context).inflate(R.layout.dialog_input, null)
+        val editText = dialogView.findViewById<EditText>(R.id.editText)
+        editText.hint = hint
+
+        MaterialAlertDialogBuilder(context)
+            .setTitle(title)
+            .setView(dialogView)
+            .setPositiveButton(R.string.create) { _, _ ->
+                callback.onPositiveButtonClicked(editText.text.toString())
+            }
+            .setNegativeButton(R.string.cancel) { dialog, _ ->
+                dialog.dismiss()
+            }
+            .create()
+            .show()
+    }
+
+    interface DialogCallback {
+        fun onPositiveButtonClicked()
+        fun onNegativeButtonClicked()
+        fun onNaturalButtonClicked()
+    }
+
+    interface InputDialogCallback {
+        fun onPositiveButtonClicked(input: String)
+    }
 }

app/src/main/java/devs/org/calculator/utils/FileManager.kt

@@ -1,5 +1,6 @@
 package devs.org.calculator.utils
 
+import android.Manifest
 import android.app.Activity
 import android.app.RecoverableSecurityException
 import android.content.ActivityNotFoundException
@@ -8,6 +9,8 @@ import android.content.Intent
 import android.net.Uri
 import android.os.Build
 import android.os.Environment
+import android.os.Handler
+import android.os.Looper
 import android.provider.MediaStore
 import android.provider.Settings
 import android.webkit.MimeTypeMap
@@ -15,20 +18,26 @@ import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.IntentSenderRequest
 import androidx.core.app.ActivityCompat
+import androidx.core.content.FileProvider
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.lifecycleScope
 import devs.org.calculator.callbacks.FileProcessCallback
+import devs.org.calculator.database.AppDatabase
+import devs.org.calculator.database.HiddenFileEntity
+import devs.org.calculator.database.HiddenFileRepository
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
-import android.Manifest
-import androidx.core.content.FileProvider
 
 class FileManager(private val context: Context, private val lifecycleOwner: LifecycleOwner) {
     private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
     val intent = Intent()
+    val hiddenFileRepository: HiddenFileRepository by lazy {
+        HiddenFileRepository(AppDatabase.getDatabase(context).hiddenFileDao())
+    }
 
     companion object {
         const val HIDDEN_DIR = ".CalculatorHide"
@@ -36,45 +45,53 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
         const val VIDEOS_DIR = "videos"
         const val AUDIO_DIR = "audio"
         const val DOCS_DIR = "documents"
+        const val ENCRYPTED_EXTENSION = ".enc"
     }
 
+
     fun getHiddenDirectory(): File {
         val dir = File(Environment.getExternalStorageDirectory(), HIDDEN_DIR)
         if (!dir.exists()) {
-            dir.mkdirs()
-            // Create .nomedia file to hide from media scanners
-            File(dir, ".nomedia").createNewFile()
+            val created = dir.mkdirs()
+            if (!created) {
+                throw RuntimeException("Failed to create hidden directory: ${dir.absolutePath}")
+            }
+            val nomediaFile = File(dir, ".nomedia")
+            if (!nomediaFile.exists()) {
+                nomediaFile.createNewFile()
+            }
         }
         return dir
     }
 
-
-
-    fun getFilesInHiddenDir(type: FileType): List<File> {
-        val hiddenDir = getHiddenDirectory()
-        val typeDir = File(hiddenDir, type.dirName)
-        return if (typeDir.exists()) {
-            typeDir.listFiles()?.filterNotNull()?.filter { it.name != ".nomedia" } ?: emptyList()
-        } else {
-            emptyList()
+    fun getFilesInHiddenDirFromFolder(type: FileType, folder: String): List<File> {
+        val typeDir = File(folder)
+        if (!typeDir.exists()) {
+            typeDir.mkdirs()
+            File(typeDir, ".nomedia").createNewFile()
         }
+        return typeDir.listFiles()?.filterNotNull()?.filter { it.name != ".nomedia" } ?: emptyList()
     }
 
-    fun copyFileToHiddenDir(uri: Uri, type: FileType): File? {
+    private fun copyFileToHiddenDir(uri: Uri, folderName: File, currentDir: File? = null): File? {
         return try {
             val contentResolver = context.contentResolver
 
-            // Get the target directory
-            val targetDir = File(Environment.getExternalStorageDirectory(), "$HIDDEN_DIR/${type.dirName}")
-            targetDir.mkdirs()
-            File(targetDir, ".nomedia").createNewFile()
+            // Get the target directory (i am using the current opened folder as target folder)
+            val targetDir = folderName
+            
+            // Ensure target directory exists and has .nomedia file
+            if (!targetDir.exists()) {
+                targetDir.mkdirs()
+                File(targetDir, ".nomedia").createNewFile()
+            }
 
             // Create target file
             val mimeType = contentResolver.getType(uri)
             val extension = MimeTypeMap.getSingleton()
                 .getExtensionFromMimeType(mimeType) ?: ""
             val fileName = "${System.currentTimeMillis()}.${extension}"
-            val targetFile = File(targetDir, fileName)
+            var targetFile = File(targetDir, fileName)
 
             // Copy file using DocumentFile
             contentResolver.openInputStream(uri)?.use { input ->
@@ -148,13 +165,9 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
                 // First try to delete using DocumentFile
                 val documentFile = DocumentFile.fromSingleUri(context, photoUri)
                 if (documentFile?.exists() == true && documentFile.canWrite()) {
-                    val deleted = documentFile.delete()
+                    documentFile.delete()
                     withContext(Dispatchers.Main) {
-                        if (deleted) {
 //                            Toast.makeText(context, "File deleted successfully", Toast.LENGTH_SHORT).show()
-                        } else {
-                            Toast.makeText(context, "Failed to hide/unhide file", Toast.LENGTH_SHORT).show()
-                        }
                     }
                     return@withContext
                 }
@@ -163,7 +176,7 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
                 try {
                     context.contentResolver.delete(photoUri, null, null)
                     withContext(Dispatchers.Main) {
-//                        Toast.makeText(context, "File deleted successfully", Toast.LENGTH_SHORT).show()
+//                            Toast.makeText(context, "File deleted successfully", Toast.LENGTH_SHORT).show()
                     }
                 } catch (e: SecurityException) {
                     // Handle security exception for Android 10 and above
@@ -188,7 +201,7 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
                 withContext(Dispatchers.Main) {
                     Toast.makeText(
                         context,
-                        "Error hiding/unhiding file: ${e.message}",
+                        "Error hiding/un-hiding file: ${e.message}",
                         Toast.LENGTH_LONG
                     ).show()
                 }
@@ -221,8 +234,8 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
         }
 
     }
-    class FileManager(){
-        fun getContentUriImage(context: Context, file: File, fileType: FileType): Uri? {
+    class FileManager{
+        fun getContentUriImage(context: Context, file: File): Uri? {
 
             // Query MediaStore for the file
             val projection = arrayOf(MediaStore.MediaColumns._ID)
@@ -258,8 +271,6 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
                 } catch (e: ActivityNotFoundException) {
                     Toast.makeText(activity, "Unable to open settings. Please grant permission manually.", Toast.LENGTH_SHORT).show()
                 }
-            } else {
-                Toast.makeText(activity, "Permission already granted", Toast.LENGTH_SHORT).show()
             }
         } else {
             // For Android 10 and below
@@ -274,19 +285,22 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
 
     suspend fun processMultipleFiles(
         uriList: List<Uri>,
-        fileType: FileType,
-        callback: FileProcessCallback
+        targetFolder: File,
+        callback: FileProcessCallback,
+        currentDir: File? = null
     ) {
         withContext(Dispatchers.IO) {
             val copiedFiles = mutableListOf<File>()
             for (uri in uriList) {
                 try {
-                    val file = copyFileToHiddenDir(uri, fileType)
+                    val file = copyFileToHiddenDir(uri, targetFolder, currentDir)
                     file?.let { copiedFiles.add(it) }
                 } catch (e: Exception) {
                     e.printStackTrace()
                 }
             }
+            delay(500)
+            
             withContext(Dispatchers.Main) {
                 if (copiedFiles.isNotEmpty()) {
                     callback.onFilesProcessedSuccessfully(copiedFiles)
@@ -297,12 +311,160 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
         }
     }
 
+    fun getFileType(file: File): FileType {
+        val extension = file.extension.lowercase()
+        return when (extension) {
+            "jpg", "jpeg", "png", "gif", "bmp", "webp" -> FileType.IMAGE
+            "mp4", "avi", "mkv", "mov", "wmv", "flv", "webm", "3gp" -> FileType.VIDEO
+            "mp3", "wav", "flac", "aac", "ogg", "m4a" -> FileType.AUDIO
+            else -> FileType.DOCUMENT
+        }
+    }
 
 
     enum class FileType(val dirName: String) {
         IMAGE(IMAGES_DIR),
         VIDEO(VIDEOS_DIR),
         AUDIO(AUDIO_DIR),
-        DOCUMENT(DOCS_DIR)
+        DOCUMENT(DOCS_DIR),
+        ALL("all")
     }
+
+    fun performEncryption(selectedFiles: List<File>,onEncryptionEnded :(MutableMap<File, File>)-> Unit) {
+        lifecycleOwner.lifecycleScope.launch {
+            var successCount = 0
+            var failCount = 0
+            val encryptedFiles = mutableMapOf<File, File>()
+
+            for (file in selectedFiles) {
+                try {
+                    val hiddenFile = hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                    if (hiddenFile?.isEncrypted == true) continue
+                    val originalExtension = ".${file.extension.lowercase()}"
+                    val fileType = FileManager(context,lifecycleOwner).getFileType(file)
+                    val encryptedFile = SecurityUtils.changeFileExtension(file, devs.org.calculator.utils.FileManager.ENCRYPTED_EXTENSION)
+                    if (SecurityUtils.encryptFile(context, file, encryptedFile)) {
+                        if (encryptedFile.exists()) {
+                            if (hiddenFile == null){
+                                hiddenFileRepository.insertHiddenFile(
+                                    HiddenFileEntity(
+                                        filePath = encryptedFile.absolutePath,
+                                        isEncrypted = true,
+                                        encryptedFileName = encryptedFile.name,
+                                        fileType = fileType,
+                                        fileName = file.name,
+                                        originalExtension = originalExtension
+                                    )
+                                )
+                            }else{
+                                hiddenFile.let {
+                                    hiddenFileRepository.updateEncryptionStatus(
+                                        filePath = hiddenFile.filePath,
+                                        newFilePath = encryptedFile.absolutePath,
+                                        encryptedFileName = encryptedFile.name,
+                                        isEncrypted = true
+                                    )
+                                }
+                            }
+                            if (file.delete()) {
+                                encryptedFiles[file] = encryptedFile
+                                successCount++
+                            } else {
+                                failCount++
+                            }
+                        } else {
+                            failCount++
+                        }
+                    } else {
+                        failCount++
+                    }
+                } catch (e: Exception) {
+                    failCount++
+                }
+            }
+
+            Handler(Looper.getMainLooper()).post{
+                when {
+                    successCount > 0 && failCount == 0 -> {
+                        Toast.makeText(context, "Files encrypted successfully", Toast.LENGTH_SHORT).show()
+                        onEncryptionEnded(encryptedFiles)
+                    }
+                    successCount > 0 && failCount > 0 -> {
+                        Toast.makeText(context, "Some files could not be encrypted", Toast.LENGTH_SHORT).show()
+                        onEncryptionEnded(encryptedFiles)
+                    }
+                    else -> {
+                        Toast.makeText(context, "Failed to encrypt files", Toast.LENGTH_SHORT).show()
+                        onEncryptionEnded(encryptedFiles)
+                    }
+                }
+            }
+        }
+    }
+
+    fun performDecryption(selectedFiles: List<File>,onDecryptionEnded :(MutableMap<File, File>) -> Unit) {
+        lifecycleOwner.lifecycleScope.launch {
+            var successCount = 0
+            var failCount = 0
+            val decryptedFiles = mutableMapOf<File, File>()
+
+            for (file in selectedFiles) {
+                try {
+                    val hiddenFile = hiddenFileRepository.getHiddenFileByPath(file.absolutePath)
+                    if (hiddenFile?.isEncrypted == true) {
+                        val originalExtension = hiddenFile.originalExtension
+                        val decryptedFile = SecurityUtils.changeFileExtension(file, originalExtension)
+                        if (SecurityUtils.decryptFile(context, file, decryptedFile)) {
+                            if (decryptedFile.exists() && decryptedFile.length() > 0) {
+                                hiddenFile.let {
+                                    hiddenFileRepository.updateEncryptionStatus(
+                                        filePath = file.absolutePath,
+                                        newFilePath = decryptedFile.absolutePath,
+                                        encryptedFileName = decryptedFile.name,
+                                        isEncrypted = false
+                                    )
+                                }
+                                if (file.delete()) {
+                                    decryptedFiles[file] = decryptedFile
+                                    successCount++
+                                } else {
+                                    decryptedFile.delete()
+                                    failCount++
+                                }
+                            } else {
+                                decryptedFile.delete()
+                                failCount++
+                            }
+                        } else {
+                            if (decryptedFile.exists()) {
+                                decryptedFile.delete()
+                            }
+                            failCount++
+                        }
+                    }
+                } catch (e: Exception) {
+                    failCount++
+                }
+            }
+
+            Handler(Looper.getMainLooper()).post{
+                when {
+                    successCount > 0 && failCount == 0 -> {
+                        Toast.makeText(context, "Files decrypted successfully", Toast.LENGTH_SHORT).show()
+                        onDecryptionEnded(decryptedFiles)
+                    }
+                    successCount > 0 && failCount > 0 -> {
+                        Toast.makeText(context, "Some files could not be decrypted", Toast.LENGTH_SHORT).show()
+                        onDecryptionEnded(decryptedFiles)
+                    }
+                    else -> {
+                        Toast.makeText(context, "Failed to decrypt files", Toast.LENGTH_SHORT).show()
+                        onDecryptionEnded(decryptedFiles)
+                    }
+                }
+            }
+        }
+    }
+
+
 }

app/src/main/java/devs/org/calculator/utils/FolderManager.kt

@@ -0,0 +1,52 @@
+package devs.org.calculator.utils
+
+import java.io.File
+
+class FolderManager {
+
+
+    fun createFolder(parentDir: File, folderName: String): Boolean {
+        val newFolder = File(parentDir, folderName)
+        return if (!newFolder.exists()) {
+            newFolder.mkdirs()
+            File(newFolder, ".nomedia").createNewFile()
+            true
+        } else {
+            false
+        }
+    }
+
+    fun deleteFolder(folder: File): Boolean {
+        return try {
+            if (folder.exists() && folder.isDirectory) {
+                folder.listFiles()?.forEach { file ->
+                    if (file.isFile) {
+                        file.delete()
+                    }
+                }
+                folder.delete()
+            } else {
+                false
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            false
+        }
+    }
+
+    fun getFoldersInDirectory(directory: File): List<File> {
+        return if (directory.exists() && directory.isDirectory) {
+            directory.listFiles()?.filter { it.isDirectory && it.name != ".nomedia" } ?: emptyList()
+        } else {
+            emptyList()
+        }
+    }
+
+    fun getFilesInFolder(folder: File): List<File> {
+        return if (folder.exists() && folder.isDirectory) {
+            folder.listFiles()?.filter { it.isFile && it.name != ".nomedia" } ?: emptyList()
+        } else {
+            emptyList()
+        }
+    }
+} 

app/src/main/java/devs/org/calculator/utils/PrefsUtil.kt

@@ -3,6 +3,7 @@ package devs.org.calculator.utils
 import android.content.Context
 import android.content.SharedPreferences
 import java.security.MessageDigest
+import androidx.core.content.edit
 
 class PrefsUtil(context: Context) {
     private val prefs: SharedPreferences = context.getSharedPreferences("Calculator", Context.MODE_PRIVATE)
@@ -13,17 +14,33 @@ class PrefsUtil(context: Context) {
 
     fun savePassword(password: String) {
         val hashedPassword = hashPassword(password)
-        prefs.edit()
-            .putString("password", hashedPassword)
-            .apply()
+        prefs.edit {
+            putString("password", hashedPassword)
+        }
+    }
+
+    fun setBoolean(key:String, value: Boolean){
+        return prefs.edit { putBoolean(key, value) }
+
+    }
+    fun setInt(key:String, value: Int){
+        return prefs.edit { putInt(key, value) }
+
+    }
+
+    fun getBoolean(key: String, defValue: Boolean = false): Boolean{
+        return prefs.getBoolean(key,defValue)
+    }
+    fun getInt(key: String, defValue: Int): Int{
+        return prefs.getInt(key,defValue)
     }
 
     fun resetPassword(){
-        prefs.edit()
-            .remove("password")
-            .remove("security_question")
-            .remove("security_answer")
-            .apply()
+        prefs.edit {
+            remove("password")
+                .remove("security_question")
+                .remove("security_answer")
+        }
     }
 
     fun validatePassword(input: String): Boolean {
@@ -31,11 +48,15 @@ class PrefsUtil(context: Context) {
         return stored == hashPassword(input)
     }
 
+    fun getPassword(): String{
+        return prefs.getString("password", "") ?: ""
+    }
+
     fun saveSecurityQA(question: String, answer: String) {
-        prefs.edit()
-            .putString("security_question", question)
-            .putString("security_answer", hashPassword(answer))
-            .apply()
+        prefs.edit {
+            putString("security_question", question)
+                .putString("security_answer", hashPassword(answer))
+        }
     }
 
     fun validateSecurityAnswer(answer: String): Boolean {

app/src/main/java/devs/org/calculator/utils/SecurityUtils.kt

@@ -5,60 +5,254 @@ import android.net.Uri
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileOutputStream
+import java.security.SecureRandom
 import javax.crypto.Cipher
+import javax.crypto.CipherInputStream
+import javax.crypto.CipherOutputStream
+import javax.crypto.KeyGenerator
 import javax.crypto.SecretKey
+import javax.crypto.spec.IvParameterSpec
 import javax.crypto.spec.SecretKeySpec
+import android.content.SharedPreferences
+import androidx.core.content.FileProvider
+import devs.org.calculator.database.HiddenFileEntity
+import androidx.core.content.edit
+import android.util.Log
 
-class SecurityUtils {
-    companion object {
-        private const val ALGORITHM = "AES"
-        private const val HIDDEN_FOLDER = "Calculator_Data"
+object SecurityUtils {
+    private const val ALGORITHM = "AES"
+    private const val TRANSFORMATION = "AES/CBC/PKCS5Padding"
+    private const val KEY_SIZE = 256
+    val ENCRYPTED_EXTENSION = ".enc"
+
+    private fun getSecretKey(context: Context): SecretKey {
+        val keyStore = context.getSharedPreferences("keystore", Context.MODE_PRIVATE)
+        val useCustomKey = keyStore.getBoolean("use_custom_key", false)
         
-        fun validatePassword(input: String, storedHash: String): Boolean {
-            return input.hashCode().toString() == storedHash
-        }
-
-        fun encryptFile(context: Context, sourceUri: Uri, password: String): File {
-            val inputStream = context.contentResolver.openInputStream(sourceUri)
-            val secretKey = generateKey(password)
-            val cipher = Cipher.getInstance(ALGORITHM)
-            cipher.init(Cipher.ENCRYPT_MODE, secretKey)
-
-            val hiddenDir = File(context.getExternalFilesDir(null), HIDDEN_FOLDER)
-            if (!hiddenDir.exists()) hiddenDir.mkdirs()
-
-            val encryptedFile = File(hiddenDir, "${System.currentTimeMillis()}_encrypted")
-            val outputStream = FileOutputStream(encryptedFile)
-
-            inputStream?.use { input ->
-                val buffer = ByteArray(1024)
-                var read: Int
-                while (input.read(buffer).also { read = it } != -1) {
-                    val encrypted = cipher.update(buffer, 0, read)
-                    outputStream.write(encrypted)
+        if (useCustomKey) {
+            val customKey = keyStore.getString("custom_key", null)
+            if (customKey != null) {
+                try {
+                    val messageDigest = java.security.MessageDigest.getInstance("SHA-256")
+                    val keyBytes = messageDigest.digest(customKey.toByteArray())
+                    return SecretKeySpec(keyBytes, ALGORITHM)
+                } catch (_: Exception) {
                 }
-                val finalBlock = cipher.doFinal()
-                outputStream.write(finalBlock)
             }
-            outputStream.close()
-            return encryptedFile
         }
 
-        fun decryptFile(file: File, password: String): ByteArray {
-            val secretKey = generateKey(password)
-            val cipher = Cipher.getInstance(ALGORITHM)
-            cipher.init(Cipher.DECRYPT_MODE, secretKey)
-
-            val inputStream = FileInputStream(file)
-            val bytes = inputStream.readBytes()
-            inputStream.close()
-
-            return cipher.doFinal(bytes)
-        }
-
-        private fun generateKey(password: String): SecretKey {
-            val keyBytes = password.toByteArray().copyOf(16)
-            return SecretKeySpec(keyBytes, ALGORITHM)
+        val encodedKey = keyStore.getString("secret_key", null)
+        return if (encodedKey != null) {
+            try {
+                val decodedKey = android.util.Base64.decode(encodedKey, android.util.Base64.DEFAULT)
+                SecretKeySpec(decodedKey, ALGORITHM)
+            } catch (_: Exception) {
+                generateAndStoreNewKey(keyStore)
+            }
+        } else {
+            generateAndStoreNewKey(keyStore)
         }
     }
+
+    private fun generateAndStoreNewKey(keyStore: SharedPreferences): SecretKey {
+        val keyGenerator = KeyGenerator.getInstance(ALGORITHM)
+        keyGenerator.init(KEY_SIZE, SecureRandom())
+        val key = keyGenerator.generateKey()
+        val encodedKey = android.util.Base64.encodeToString(key.encoded, android.util.Base64.DEFAULT)
+        keyStore.edit { putString("secret_key", encodedKey) }
+        return key
+    }
+
+    fun encryptFile(context: Context, inputFile: File, outputFile: File): Boolean {
+        return try {
+            if (!inputFile.exists()) {
+                return false
+            }
+
+            val secretKey = getSecretKey(context)
+            val cipher = Cipher.getInstance(TRANSFORMATION)
+            val iv = ByteArray(16)
+            SecureRandom().nextBytes(iv)
+            cipher.init(Cipher.ENCRYPT_MODE, secretKey, IvParameterSpec(iv))
+
+            FileInputStream(inputFile).use { input ->
+                FileOutputStream(outputFile).use { output ->
+                    output.write(iv)
+                    CipherOutputStream(output, cipher).use { cipherOutput ->
+                        input.copyTo(cipherOutput)
+                    }
+                }
+            }
+
+            if (!outputFile.exists() || outputFile.length() == 0L) {
+                return false
+            }
+
+            FileInputStream(outputFile).use { input ->
+                val iv = ByteArray(16)
+                val bytesRead = input.read(iv)
+                if (bytesRead != 16) {
+
+                    return false
+                }
+            }
+
+            true
+        } catch (_: Exception) {
+
+            if (outputFile.exists()) {
+                outputFile.delete()
+            }
+            false
+        }
+    }
+
+    fun getDecryptedPreviewFile(context: Context, meta: HiddenFileEntity): File? {
+        try {
+            val encryptedFile = File(meta.filePath)
+            if (!encryptedFile.exists()) {
+                Log.e("SecurityUtils", "Encrypted file does not exist: ${meta.filePath}")
+                return null
+            }
+
+            val tempDir = File(context.cacheDir, "preview_temp")
+            if (!tempDir.exists()) {
+                if (!tempDir.mkdirs()) {
+                    Log.e("SecurityUtils", "Failed to create temp directory")
+                    return null
+                }
+            }
+
+            // Clean up old preview files
+            tempDir.listFiles()?.forEach { 
+                if (it.lastModified() < System.currentTimeMillis() - 5 * 60 * 1000) { // 5 minutes
+                    it.delete()
+                }
+            }
+
+            val tempFile = File(tempDir, "preview_${System.currentTimeMillis()}_${meta.fileName}")
+            
+            val success = decryptFile(context, encryptedFile, tempFile)
+            
+            if (success && tempFile.exists() && tempFile.length() > 0) {
+                return tempFile
+            } else {
+                Log.e("SecurityUtils", "Failed to decrypt preview file: ${meta.filePath}")
+                if (tempFile.exists()) tempFile.delete()
+                return null
+            }
+        } catch (e: Exception) {
+            Log.e("SecurityUtils", "Error in getDecryptedPreviewFile: ${e.message}")
+            return null
+        }
+    }
+
+    fun getUriForPreviewFile(context: Context, file: File): Uri? {
+        return try {
+            if (!file.exists() || file.length() == 0L) {
+                Log.e("SecurityUtils", "Preview file does not exist or is empty: ${file.absolutePath}")
+                return null
+            }
+            FileProvider.getUriForFile(
+                context,
+                "${context.packageName}.provider",
+                file
+            )
+        } catch (e: Exception) {
+            Log.e("SecurityUtils", "Error getting URI for preview file: ${e.message}")
+            null
+        }
+    }
+
+    fun decryptFile(context: Context, inputFile: File, outputFile: File): Boolean {
+        return try {
+            if (!inputFile.exists()) {
+                return false
+            }
+
+            if (inputFile.length() == 0L) {
+                return false
+            }
+
+            val secretKey = getSecretKey(context)
+            val cipher = Cipher.getInstance(TRANSFORMATION)
+            FileInputStream(inputFile).use { input ->
+                val iv = ByteArray(16)
+                val bytesRead = input.read(iv)
+                if (bytesRead != 16) {
+                    return false
+                }
+                
+                cipher.init(Cipher.DECRYPT_MODE, secretKey, IvParameterSpec(iv))
+
+                FileInputStream(inputFile).use { decInput ->
+                    decInput.skip(16)
+                    
+                    FileOutputStream(outputFile).use { output ->
+                        CipherInputStream(decInput, cipher).use { cipherInput ->
+                            cipherInput.copyTo(output)
+                        }
+                    }
+                }
+            }
+
+            if (!outputFile.exists() || outputFile.length() == 0L) {
+                return false
+            }
+
+            true
+        } catch (_: Exception) {
+            if (outputFile.exists()) {
+                outputFile.delete()
+            }
+            false
+        }
+    }
+
+    fun getFileExtension(file: File): String {
+        val name = file.name
+        val lastDotIndex = name.lastIndexOf('.')
+        return if (lastDotIndex > 0) {
+            name.substring(lastDotIndex)
+        } else {
+            ""
+        }
+    }
+
+    fun changeFileExtension(file: File, newExtension: String): File {
+        val name = file.name
+        val lastDotIndex = name.lastIndexOf('.')
+        val newName = if (lastDotIndex > 0) {
+            name.substring(0, lastDotIndex) + newExtension
+        } else {
+            name + newExtension
+        }
+        return File(file.parent, newName)
+    }
+
+    fun setCustomKey(context: Context, key: String): Boolean {
+        return try {
+            val keyStore = context.getSharedPreferences("keystore", Context.MODE_PRIVATE)
+            keyStore.edit {
+                putString("custom_key", key)
+                putBoolean("use_custom_key", true)
+            }
+            true
+        } catch (_: Exception) {
+            false
+        }
+    }
+
+    fun clearCustomKey(context: Context) {
+        val keyStore = context.getSharedPreferences("keystore", Context.MODE_PRIVATE)
+        keyStore.edit {
+            remove("custom_key")
+            putBoolean("use_custom_key", false)
+        }
+    }
+
+    fun isUsingCustomKey(context: Context): Boolean {
+        val keyStore = context.getSharedPreferences("keystore", Context.MODE_PRIVATE)
+        return keyStore.getBoolean("use_custom_key", false)
+    }
 } 

app/src/main/java/devs/org/calculator/utils/StoragePermissionUtil.kt

@@ -7,34 +7,31 @@ import android.net.Uri
 import android.os.Build
 import android.os.Environment
 import android.provider.Settings
+import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.core.content.PermissionChecker
+import androidx.core.net.toUri
 
 class StoragePermissionUtil(private val activity: AppCompatActivity) {
-    
-    private val requestPermissionLauncher = activity.registerForActivityResult(
-        ActivityResultContracts.RequestMultiplePermissions()
-    ) { permissions ->
-        if (permissions.all { it.value }) {
-            onPermissionGranted?.invoke()
-        }
-    }
 
     private var onPermissionGranted: (() -> Unit)? = null
 
-    fun requestStoragePermission(onGranted: () -> Unit) {
+    fun requestStoragePermission(
+        launcher: ActivityResultLauncher<Array<String>>,
+        onGranted: () -> Unit
+    ) {
         onPermissionGranted = onGranted
-        
+
         when {
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.R -> {
                 if (Environment.isExternalStorageManager()) {
                     onGranted()
                 } else {
                     val intent = Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION).apply {
-                        data = Uri.parse("package:${activity.packageName}")
+                        data = "package:${activity.packageName}".toUri()
                     }
                     activity.startActivity(intent)
                 }
@@ -44,7 +41,7 @@ class StoragePermissionUtil(private val activity: AppCompatActivity) {
                     Manifest.permission.READ_EXTERNAL_STORAGE,
                     Manifest.permission.WRITE_EXTERNAL_STORAGE
                 )
-                requestPermissionLauncher.launch(permissions)
+                launcher.launch(permissions)
             }
         }
     }
@@ -65,4 +62,10 @@ class StoragePermissionUtil(private val activity: AppCompatActivity) {
                     writePermission == PermissionChecker.PERMISSION_GRANTED
         }
     }
-} 
+
+    fun handlePermissionResult(permissions: Map<String, Boolean>) {
+        if (permissions.all { it.value }) {
+            onPermissionGranted?.invoke()
+        }
+    }
+}

app/src/main/res/anim/fab_close.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<scale xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="200"
+    android:fromXScale="1.0"
+    android:fromYScale="1.0"
+    android:toXScale="0.0"
+    android:toYScale="0.0"
+    android:pivotX="50%"
+    android:pivotY="50%" />

app/src/main/res/anim/fab_open.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<scale xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="200"
+    android:fromXScale="0.0"
+    android:fromYScale="0.0"
+    android:toXScale="1.0"
+    android:toYScale="1.0"
+    android:pivotX="50%"
+    android:pivotY="50%" />

app/src/main/res/anim/rotate_close.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rotate xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="200"
+    android:fromDegrees="45"
+    android:toDegrees="0"
+    android:pivotX="50%"
+    android:pivotY="50%" />

app/src/main/res/anim/rotate_open.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rotate xmlns:android="http://schemas.android.com/apk/res/android"
+    android:duration="200"
+    android:fromDegrees="0"
+    android:toDegrees="45"
+    android:pivotX="50%"
+    android:pivotY="50%" />

app/src/main/res/drawable/add_image.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="50dp"
+    android:height="50dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M23,4v2h-3v3h-2L18,6h-3L15,4h3L18,1h2v3h3zM14.5,11c0.828,0 1.5,-0.672 1.5,-1.5S15.328,8 14.5,8 13,8.672 13,9.5s0.672,1.5 1.5,1.5zM18,14.234l-0.513,-0.57c-0.794,-0.885 -2.18,-0.885 -2.976,0l-0.655,0.73L9,9l-3,3.333L6,6h7L13,4L6,4c-1.105,0 -2,0.895 -2,2v12c0,1.105 0.895,2 2,2h12c1.105,0 2,-0.895 2,-2v-7h-2v3.234z"/>
+</vector>

app/src/main/res/drawable/backspace.xml

@@ -2,12 +2,12 @@
       
     <path android:fillColor="#00000000"
         android:pathData="M7.7,6.36L3.533,11.36C3.224,11.731 3.224,12.269 3.533,12.64L7.7,17.64C7.89,17.868 8.172,18 8.468,18H18C19.657,18 21,16.657 21,15V9C21,7.343 19.657,6 18,6H8.468C8.172,6 7.89,6.132 7.7,6.36Z"
-        android:strokeColor="@color/textColor" android:strokeLineCap="round"
+        android:strokeColor="@color/white" android:strokeLineCap="round"
         android:strokeLineJoin="round" android:strokeWidth="2"/>
       
     <path android:fillColor="#00000000"
         android:pathData="M15,10L13,12M13,12L11,14M13,12L11,10M13,12L15,14"
-        android:strokeColor="@color/textColor"
+        android:strokeColor="@color/white"
         android:strokeLineCap="round"
         android:strokeLineJoin="round"
         android:strokeWidth="2"/>

app/src/main/res/drawable/bottom_corner.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <corners android:bottomLeftRadius="15dp" android:bottomRightRadius="15dp"/>
+    <solid android:color="?attr/colorSecondaryContainer"/>
+</shape>

app/src/main/res/drawable/bottom_shade.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <gradient android:startColor="#CC000000" android:centerColor="#00ffffff" android:endColor="#00ffffff" android:angle="90"/>
+</shape>

app/src/main/res/drawable/document_add.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="205dp"
+    android:height="205dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M15,12h-2v-2c0,-0.553 -0.447,-1 -1,-1s-1,0.447 -1,1v2h-2c-0.553,0 -1,0.447 -1,1s0.447,1 1,1h2v2c0,0.553 0.447,1 1,1s1,-0.447 1,-1v-2h2c0.553,0 1,-0.447 1,-1s-0.447,-1 -1,-1zM19.707,7.293l-4,-4c-0.187,-0.188 -0.441,-0.293 -0.707,-0.293h-8c-1.654,0 -3,1.346 -3,3v12c0,1.654 1.346,3 3,3h10c1.654,0 3,-1.346 3,-3v-10c0,-0.266 -0.105,-0.52 -0.293,-0.707zM17.586,8h-1.086c-0.827,0 -1.5,-0.673 -1.5,-1.5v-1.086l2.586,2.586zM17,19h-10c-0.552,0 -1,-0.448 -1,-1v-12c0,-0.552 0.448,-1 1,-1h7v1.5c0,1.379 1.121,2.5 2.5,2.5h1.5v9c0,0.552 -0.448,1 -1,1z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/drawable/encrypted.xml

@@ -0,0 +1,17 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="50dp" android:viewportHeight="73" android:viewportWidth="73" android:width="50dp">
+      
+    <path android:fillColor="#00FFFFFF" android:fillType="nonZero" android:pathData="M15,1L58,1A14,14 0,0 1,72 15L72,58A14,14 0,0 1,58 72L15,72A14,14 0,0 1,1 58L1,15A14,14 0,0 1,15 1z" android:strokeColor="#0004673E" android:strokeWidth="2"/>
+      
+    <path android:fillColor="#00DD80" android:fillType="nonZero" android:pathData="M54.191,43.754C52.953,47.108 51.081,50.025 48.626,52.423C45.832,55.151 42.173,57.319 37.751,58.866C37.605,58.917 37.454,58.958 37.302,58.989C37.101,59.028 36.896,59.05 36.694,59.053L36.654,59.053C36.438,59.053 36.221,59.031 36.005,58.989C35.853,58.958 35.704,58.917 35.56,58.867C31.132,57.323 27.469,55.156 24.671,52.427C22.215,50.03 20.344,47.115 19.108,43.76C16.86,37.66 16.988,30.941 17.091,25.542L17.093,25.459C17.113,25.013 17.127,24.544 17.134,24.027C17.172,21.488 19.191,19.387 21.73,19.246C27.025,18.95 31.121,17.223 34.621,13.812L34.652,13.784C35.233,13.251 35.965,12.989 36.694,13C37.396,13.009 38.096,13.271 38.657,13.784L38.687,13.812C42.187,17.223 46.283,18.95 51.578,19.246C54.118,19.387 56.137,21.488 56.174,24.027C56.182,24.548 56.195,25.016 56.216,25.459L56.217,25.494C56.319,30.904 56.446,37.636 54.191,43.754Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+      
+    <path android:fillColor="#03D078" android:fillType="nonZero" android:pathData="M54.191,43.754C52.953,47.108 51.081,50.025 48.626,52.423C45.832,55.151 42.173,57.319 37.751,58.866C37.605,58.917 37.454,58.958 37.302,58.989C37.101,59.028 36.896,59.05 36.694,59.053L36.694,13C37.396,13.009 38.096,13.271 38.657,13.784L38.687,13.812C42.187,17.223 46.283,18.95 51.578,19.246C54.118,19.387 56.137,21.488 56.174,24.027C56.182,24.548 56.195,25.016 56.216,25.459L56.217,25.494C56.319,30.904 56.446,37.636 54.191,43.754Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+      
+    <path android:fillColor="#00FFFFFF" android:fillType="nonZero" android:pathData="M48.131,36.026C48.131,42.341 43.003,47.482 36.694,47.504L36.653,47.504C30.325,47.504 25.176,42.355 25.176,36.026C25.176,29.698 30.325,24.549 36.653,24.549L36.694,24.549C43.003,24.571 48.131,29.712 48.131,36.026Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+      
+    <path android:fillColor="#00E1EBF0" android:fillType="nonZero" android:pathData="M48.131,36.026C48.131,42.341 43.003,47.482 36.694,47.504L36.694,24.549C43.003,24.571 48.131,29.712 48.131,36.026Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+      
+    <path android:fillColor="#FFFFFF" android:fillType="nonZero" android:pathData="M41.863,34.374L36.694,39.543L35.577,40.66C35.313,40.924 34.967,41.056 34.621,41.056C34.275,41.056 33.929,40.924 33.665,40.66L31.264,38.258C30.736,37.73 30.736,36.875 31.264,36.347C31.791,35.819 32.646,35.819 33.174,36.347L34.621,37.794L39.952,32.463C40.48,31.935 41.336,31.935 41.863,32.463C42.391,32.991 42.391,33.847 41.863,34.374Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+      
+    <path android:fillColor="#F8F6F6" android:fillType="nonZero" android:pathData="M41.863,34.374L36.694,39.543L36.694,35.721L39.952,32.463C40.48,31.935 41.336,31.935 41.863,32.463C42.391,32.991 42.391,33.847 41.863,34.374Z" android:strokeColor="#00000000" android:strokeWidth="1"/>
+    
+</vector>

app/src/main/res/drawable/gradient_bg.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <corners android:radius="15dp"/>
+    <gradient android:startColor="?attr/colorPrimary" android:endColor="?attr/colorPrimary" android:angle="75"/>
+</shape>

app/src/main/res/drawable/ic_add.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19,13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/>
+</vector> 

app/src/main/res/drawable/ic_audio.xml

@@ -1,9 +1,5 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-    <path
-        android:fillColor="@color/textColor"
-        android:pathData="M12,3v9.28c-0.47,-0.17 -0.97,-0.28 -1.5,-0.28C8.01,12 6,14.01 6,16.5S8.01,21 10.5,21c2.31,0 4.2,-1.75 4.45,-4H15V6h4V3h-7z"/>
-</vector> 
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+      
+    <path android:fillColor="?attr/colorPrimary" android:pathData="M13.75,2C13.75,1.586 13.414,1.25 13,1.25C12.586,1.25 12.25,1.586 12.25,2V14.536C11.4,13.738 10.257,13.25 9,13.25C6.377,13.25 4.25,15.377 4.25,18C4.25,20.623 6.377,22.75 9,22.75C11.623,22.75 13.75,20.623 13.75,18V6.243C14.988,7.772 16.879,8.75 19,8.75C19.414,8.75 19.75,8.414 19.75,8C19.75,7.586 19.414,7.25 19,7.25C16.101,7.25 13.75,4.899 13.75,2Z"/>
+    
+</vector>

app/src/main/res/drawable/ic_back.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="1024"
+    android:viewportHeight="1024">
+  <path
+      android:pathData="M224,480h640a32,32 0,1 1,0 64H224a32,32 0,0 1,0 -64z"
+      android:fillColor="@color/svgTintColor"/>
+  <path
+      android:pathData="m237.2,512 l265.4,265.3a32,32 0,0 1,-45.3 45.3l-288,-288a32,32 0,0 1,0 -45.3l288,-288a32,32 0,1 1,45.3 45.3L237.2,512z"
+      android:fillColor="@color/svgTintColor"/>
+</vector>

app/src/main/res/drawable/ic_close.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
+</vector> 

app/src/main/res/drawable/ic_create_new_folder.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M20,6h-8l-2,-2L4,4c-1.11,0 -1.99,0.89 -1.99,2L2,18c0,1.11 0.89,2 2,2h16c1.11,0 2,-0.89 2,-2L22,8c0,-1.11 -0.89,-2 -2,-2zM20,18L4,18L4,8h16v10zM14,12h-2v-2h-2v2L8,12v2h2v2h2v-2h2z"/>
+</vector> 

app/src/main/res/drawable/ic_delete.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#fff"
+        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector> 

app/src/main/res/drawable/ic_document.xml

@@ -1,9 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
     android:viewportWidth="24"
     android:viewportHeight="24">
     <path
-        android:fillColor="@color/textColor"
-        android:pathData="M14,2H6C4.9,2 4,2.9 4,4v16c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V8L14,2zM16,18H8v-2h8V18zM16,14H8v-2h8V14zM13,9V3.5L18.5,9H13z"/>
+        android:fillColor="#FFFFFF"
+        android:pathData="M14,2L6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6zM16,18L8,18v-2h8v2zM16,14L8,14v-2h8v2zM13,9L13,3.5L18.5,9L13,9z"/>
 </vector> 

app/src/main/res/drawable/ic_edit.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"
+      android:fillColor="#fff"/>
+</vector>

app/src/main/res/drawable/ic_file.xml

@@ -1,9 +1,9 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
+    android:width="50dp"
+    android:height="50dp"
     android:viewportWidth="24"
     android:viewportHeight="24">
-    <path
-        android:fillColor="@color/textColor"
-        android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2H18c1.1,0 2,-0.9 2,-2V8l-6,-6H6zM13,9V3.5L18.5,9H13z"/>
-</vector> 
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M13.172,2H6C4.9,2 4,2.9 4,4v16c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V8.828c0,-0.53 -0.211,-1.039 -0.586,-1.414l-4.828,-4.828C14.211,2.211 13.702,2 13.172,2zM15,18H9c-0.552,0 -1,-0.448 -1,-1v0c0,-0.552 0.448,-1 1,-1h6c0.552,0 1,0.448 1,1v0C16,17.552 15.552,18 15,18zM15,14H9c-0.552,0 -1,-0.448 -1,-1v0c0,-0.552 0.448,-1 1,-1h6c0.552,0 1,0.448 1,1v0C16,13.552 15.552,14 15,14zM13,9V3.5L18.5,9H13z"/>
+</vector>

app/src/main/res/drawable/ic_file_no_item.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="50dp"
+    android:height="50dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#757575"
+      android:pathData="M13.172,2H6C4.9,2 4,2.9 4,4v16c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V8.828c0,-0.53 -0.211,-1.039 -0.586,-1.414l-4.828,-4.828C14.211,2.211 13.702,2 13.172,2zM15,18H9c-0.552,0 -1,-0.448 -1,-1v0c0,-0.552 0.448,-1 1,-1h6c0.552,0 1,0.448 1,1v0C16,17.552 15.552,18 15,18zM15,14H9c-0.552,0 -1,-0.448 -1,-1v0c0,-0.552 0.448,-1 1,-1h6c0.552,0 1,0.448 1,1v0C16,13.552 15.552,14 15,14zM13,9V3.5L18.5,9H13z"/>
+</vector>

app/src/main/res/drawable/ic_folder.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorPrimary"
+        android:pathData="M20,6h-8l-2,-2L4,4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2L22,8c0,-1.1 -0.9,-2 -2,-2zM20,18L4,18L4,8h16v10z"/>
+</vector> 

app/src/main/res/drawable/ic_folder_add.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M20,6h-8l-2,-2L4,4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2L22,8c0,-1.1 -0.9,-2 -2,-2zM20,18L4,18L4,8h16v10z"/>
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M15,13h-2v2h-2v-2H9v-2h2V9h2v2h2v2z"/>
+</vector> 

app/src/main/res/drawable/ic_folder_yellow.xml

@@ -0,0 +1,37 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="32"
+    android:viewportHeight="32">
+  <path
+      android:pathData="M2.909,3.5L11.283,3.5C12.441,3.5 13.551,3.96 14.369,4.778L14.722,5.131C15.54,5.949 16.65,6.409 17.807,6.409L23.273,6.409C24.076,6.409 24.762,6.693 25.33,7.261C25.898,7.829 26.182,8.515 26.182,9.318L26.182,25.318C26.182,26.122 25.898,26.807 25.33,27.375C24.762,27.943 24.076,28.227 23.273,28.227L2.909,28.227C2.106,28.227 1.42,27.943 0.852,27.375C0.284,26.807 0,26.122 0,25.318L0,6.409C0,5.606 0.284,4.92 0.852,4.352C1.42,3.784 2.106,3.5 2.909,3.5Z"
+      android:fillType="evenOdd">
+    <aapt:attr name="android:fillColor">
+      <gradient 
+          android:startX="16"
+          android:startY="3.5"
+          android:endX="16"
+          android:endY="19.854"
+          android:type="linear">
+        <item android:offset="0" android:color="#FFFBA200"/>
+        <item android:offset="1" android:color="#FFFF7300"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+  <path
+      android:pathData="M5.818,25.318L5.818,12.227C5.818,11.424 6.102,10.738 6.67,10.17C7.238,9.602 7.924,9.318 8.727,9.318L29.091,9.318C29.894,9.318 30.58,9.602 31.148,10.17C31.716,10.738 32,11.424 32,12.227L32,25.318C32,26.122 31.716,26.807 31.148,27.375C30.58,27.943 29.894,28.227 29.091,28.227L2.909,28.227C3.712,28.227 4.398,27.943 4.966,27.375C5.534,26.807 5.818,26.122 5.818,25.318Z"
+      android:fillType="evenOdd">
+    <aapt:attr name="android:fillColor">
+      <gradient 
+          android:startX="17.454"
+          android:startY="9.318"
+          android:endX="17.454"
+          android:endY="28.227"
+          android:type="linear">
+        <item android:offset="0" android:color="#FFFAC227"/>
+        <item android:offset="1" android:color="#FFFAA627"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+</vector>

app/src/main/res/drawable/ic_github.xml

@@ -0,0 +1,10 @@
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:height="24dp"
+    android:viewportHeight="20"
+    android:viewportWidth="20"
+    android:width="24dp">
+      
+    <path android:fillColor="@color/black" android:fillType="evenOdd" android:pathData="M10,0C15.523,0 20,4.59 20,10.253C20,14.782 17.138,18.624 13.167,19.981C12.66,20.082 12.48,19.762 12.48,19.489C12.48,19.151 12.492,18.047 12.492,16.675C12.492,15.719 12.172,15.095 11.813,14.777C14.04,14.523 16.38,13.656 16.38,9.718C16.38,8.598 15.992,7.684 15.35,6.966C15.454,6.707 15.797,5.664 15.252,4.252C15.252,4.252 14.414,3.977 12.505,5.303C11.706,5.076 10.85,4.962 10,4.958C9.15,4.962 8.295,5.076 7.497,5.303C5.586,3.977 4.746,4.252 4.746,4.252C4.203,5.664 4.546,6.707 4.649,6.966C4.01,7.684 3.619,8.598 3.619,9.718C3.619,13.646 5.954,14.526 8.175,14.785C7.889,15.041 7.63,15.493 7.54,16.156C6.97,16.418 5.522,16.871 4.63,15.304C4.63,15.304 4.101,14.319 3.097,14.247C3.097,14.247 2.122,14.234 3.029,14.87C3.029,14.87 3.684,15.185 4.139,16.37C4.139,16.37 4.726,18.2 7.508,17.58C7.513,18.437 7.522,19.245 7.522,19.489C7.522,19.76 7.338,20.077 6.839,19.982C2.865,18.627 0,14.783 0,10.253C0,4.59 4.478,0 10,0" android:strokeColor="#00000000" android:strokeWidth="1"/>
+    
+</vector>

app/src/main/res/drawable/ic_grid.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="169dp"
+    android:height="169dp"
+    android:viewportWidth="35.28"
+    android:viewportHeight="35.28">
+  <path
+      android:pathData="M27.64,3.64L23.64,3.64C21.431,3.64 19.64,5.431 19.64,7.64L19.64,11.64C19.64,13.849 21.431,15.64 23.64,15.64L27.64,15.64C29.849,15.64 31.64,13.849 31.64,11.64L31.64,7.64C31.64,5.431 29.849,3.64 27.64,3.64L27.64,3.64ZM27.64,19.64L23.64,19.64C21.431,19.64 19.64,21.431 19.64,23.64L19.64,27.64C19.64,29.849 21.431,31.64 23.64,31.64L27.64,31.64C29.849,31.64 31.64,29.849 31.64,27.64L31.64,23.64C31.64,21.431 29.849,19.64 27.64,19.64L27.64,19.64ZM11.64,19.64L7.64,19.64C5.431,19.64 3.64,21.431 3.64,23.64L3.64,27.64C3.64,29.849 5.431,31.64 7.64,31.64L11.64,31.64C13.849,31.64 15.64,29.849 15.64,27.64L15.64,23.64C15.64,21.431 13.849,19.64 11.64,19.64L11.64,19.64ZM11.64,3.64L7.64,3.64C5.431,3.64 3.64,5.431 3.64,7.64L3.64,11.64C3.64,13.849 5.431,15.64 7.64,15.64L11.64,15.64C13.849,15.64 15.64,13.849 15.64,11.64L15.64,7.64C15.64,5.431 13.849,3.64 11.64,3.64L11.64,3.64Z"
+      android:strokeWidth="1"
+      android:fillColor="?attr/colorPrimary"
+      android:fillType="evenOdd"
+      android:strokeColor="#00000000"/>
+</vector>

app/src/main/res/drawable/ic_image.xml

@@ -1,9 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="24dp"
     android:height="24dp"
     android:viewportWidth="24"
     android:viewportHeight="24">
     <path
-        android:fillColor="@color/textColor"
+        android:fillColor="#FFFFFF"
         android:pathData="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
 </vector> 

app/src/main/res/drawable/ic_list.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="16"
+    android:viewportHeight="16">
+  <path
+      android:pathData="M4,13L2,13L2,11L4,11ZM14,11L6,11v2h8ZM4,7L2,7L2,9L4,9ZM14,7L6,7L6,9h8ZM4,3L2,3L2,5L4,5ZM14,3L6,3L6,5h8Z"
+      android:fillColor="#ffffff"/>
+</vector>

app/src/main/res/drawable/ic_more.xml

@@ -0,0 +1,8 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:height="24dp" android:viewportHeight="24"
+    android:viewportWidth="24" android:width="24dp">
+      
+    <path android:fillColor="#fff"
+        android:pathData="M12,12H12.01M12,6H12.01M12,18H12.01M13,12C13,12.552 12.552,13 12,13C11.448,13 11,12.552 11,12C11,11.448 11.448,11 12,11C12.552,11 13,11.448 13,12ZM13,18C13,18.552 12.552,19 12,19C11.448,19 11,18.552 11,18C11,17.448 11.448,17 12,17C12.552,17 13,17.448 13,18ZM13,6C13,6.552 12.552,7 12,7C11.448,7 11,6.552 11,6C11,5.448 11.448,5 12,5C12.552,5 13,5.448 13,6Z" android:strokeColor="#fff" android:strokeLineCap="round" android:strokeLineJoin="round" android:strokeWidth="2"/>
+    
+</vector>

app/src/main/res/drawable/ic_no_items.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#757575"
+        android:pathData="M20,6h-8l-2,-2L4,4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2L22,8c0,-1.1 -0.9,-2 -2,-2zM20,18L4,18L4,8h16v10z"/>
+</vector> 

app/src/main/res/drawable/ic_play_circle.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="48"
+    android:viewportHeight="48">
+  <path
+      android:fillColor="?attr/colorPrimary"
+      android:pathData="M34.6,23.3 L18.1,13.2c-0.6,-0.4 -1.1,-0.1 -1.1,0.6V34.2c0,0.7 0.5,1 1.1,0.6L34.6,24.7A0.8,0.8 0,0 0,34.6 23.3Z"/>
+  <path
+      android:fillColor="?attr/colorPrimary"
+      android:pathData="M24,2A22,22 0,1 0,46 24,21.9 21.9,0 0,0 24,2ZM24,42A18,18 0,1 1,42 24,18.1 18.1,0 0,1 24,42Z"/>
+</vector>

app/src/main/res/drawable/ic_setting.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+      
+    <path android:fillAlpha="1" android:fillColor="?attr/colorPrimary" android:pathData="M17.88,18.6C17.88,19.926 16.806,21 15.48,21C14.155,21 13.08,19.926 13.08,18.6C13.08,17.274 14.155,16.2 15.48,16.2C16.806,16.2 17.88,17.274 17.88,18.6Z"/>
+      
+    <path android:fillAlpha="1" android:fillColor="?attr/colorPrimary" android:pathData="M9.48,12C9.48,13.325 8.405,14.4 7.08,14.4C5.755,14.4 4.68,13.325 4.68,12C4.68,10.675 5.755,9.6 7.08,9.6C8.405,9.6 9.48,10.675 9.48,12Z"/>
+      
+    <path android:fillAlpha="1" android:fillColor="?attr/colorPrimary" android:pathData="M17.88,5.4C17.88,6.725 16.806,7.8 15.48,7.8C14.155,7.8 13.08,6.725 13.08,5.4C13.08,4.075 14.155,3 15.48,3C16.806,3 17.88,4.075 17.88,5.4Z"/>
+      
+    <path android:fillColor="#00000000" android:pathData="M18.48,18.537H21M4.68,12L3,12.044M4.68,12C4.68,13.325 5.755,14.4 7.08,14.4C8.405,14.4 9.48,13.325 9.48,12C9.48,10.675 8.405,9.6 7.08,9.6C5.755,9.6 4.68,10.675 4.68,12ZM10.169,12.044H21M12.801,5.551L3,5.551M21,5.551H18.48M3,18.537H12.801M17.88,18.6C17.88,19.926 16.806,21 15.48,21C14.155,21 13.08,19.926 13.08,18.6C13.08,17.274 14.155,16.2 15.48,16.2C16.806,16.2 17.88,17.274 17.88,18.6ZM17.88,5.4C17.88,6.725 16.806,7.8 15.48,7.8C14.155,7.8 13.08,6.725 13.08,5.4C13.08,4.075 14.155,3 15.48,3C16.806,3 17.88,4.075 17.88,5.4Z" android:strokeColor="?attr/colorPrimary" android:strokeLineCap="round" android:strokeWidth="1.5"/>
+    
+</vector>

app/src/main/res/drawable/ic_settings.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M4,13.743l-1,0.579a1,1 0,0 0,-0.366 1.366l1.488,2.578a1,1 0,0 0,1.366 0.366L6.5,18.05a1.987,1.987 0,0 1,1.986 0l0.02,0.011a1.989,1.989 0,0 1,1 1.724V21a1,1 0,0 0,1 1h3a1,1 0,0 0,1 -1V19.782a1.985,1.985 0,0 1,0.995 -1.721l0.021,-0.012a1.987,1.987 0,0 1,1.986 0l1.008,0.582a1,1 0,0 0,1.366 -0.366l1.488,-2.578A1,1 0,0 0,21 14.322l-1,-0.579a1.994,1.994 0,0 1,-1 -1.733v-0.021a1.991,1.991 0,0 1,1 -1.732l1,-0.579a1,1 0,0 0,0.366 -1.366L19.876,5.734a1,1 0,0 0,-1.366 -0.366L17.5,5.95a1.987,1.987 0,0 1,-1.986 0L15.5,5.94a1.989,1.989 0,0 1,-1 -1.724V3a1,1 0,0 0,-1 -1h-3a1,1 0,0 0,-1 1V4.294A1.856,1.856 0,0 1,8.57 5.9l-0.153,0.088a1.855,1.855 0,0 1,-1.853 0L5.49,5.368a1,1 0,0 0,-1.366 0.366L2.636,8.312A1,1 0,0 0,3 9.678l1,0.579A1.994,1.994 0,0 1,5 11.99v0.021A1.991,1.991 0,0 1,4 13.743ZM12,9a3,3 0,1 1,-3 3A3,3 0,0 1,12 9Z"
+      android:fillColor="#fff"/>
+</vector>

app/src/main/res/drawable/ic_video.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M17,10.5V7c0,-0.55 -0.45,-1 -1,-1H4c-0.55,0 -1,0.45 -1,1v10c0,0.55 0.45,1 1,1h12c0.55,0 1,-0.45 1,-1v-3.5l4,4v-11l-4,4z"/>
+</vector> 

app/src/main/res/drawable/music.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportWidth="24"
-    android:viewportHeight="24">
-  <path
-      android:pathData="M13.75,2C13.75,1.586 13.414,1.25 13,1.25C12.586,1.25 12.25,1.586 12.25,2V14.536C11.4,13.738 10.257,13.25 9,13.25C6.377,13.25 4.25,15.377 4.25,18C4.25,20.623 6.377,22.75 9,22.75C11.623,22.75 13.75,20.623 13.75,18V6.243C14.988,7.772 16.879,8.75 19,8.75C19.414,8.75 19.75,8.414 19.75,8C19.75,7.586 19.414,7.25 19,7.25C16.101,7.25 13.75,4.899 13.75,2Z"
-      android:fillColor="@color/textColor"/>
-</vector>

app/src/main/res/drawable/music_add.xml

@@ -0,0 +1,41 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M17,6.5H20M23,6.5H20M20,6.5V3.5M20,6.5V9.5"
+      android:strokeLineJoin="round"
+      android:strokeWidth="1.5"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"
+      android:strokeLineCap="round"/>
+  <path
+      android:pathData="M6,16V5L14,4"
+      android:strokeLineJoin="round"
+      android:strokeWidth="1.5"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"
+      android:strokeLineCap="round"/>
+  <path
+      android:pathData="M15,14V10"
+      android:strokeLineJoin="round"
+      android:strokeWidth="1.5"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"
+      android:strokeLineCap="round"/>
+  <path
+      android:pathData="M12,19H13C14.105,19 15,18.105 15,17V14H12C10.895,14 10,14.895 10,16V17C10,18.105 10.895,19 12,19Z"
+      android:strokeLineJoin="round"
+      android:strokeWidth="1.5"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"
+      android:strokeLineCap="round"/>
+  <path
+      android:pathData="M3,21H4C5.105,21 6,20.105 6,19V16H3C1.895,16 1,16.895 1,18V19C1,20.105 1.895,21 3,21Z"
+      android:strokeLineJoin="round"
+      android:strokeWidth="1.5"
+      android:fillColor="#00000000"
+      android:strokeColor="#000000"
+      android:strokeLineCap="round"/>
+</vector>

app/src/main/res/drawable/next.xml

@@ -5,6 +5,6 @@
     android:viewportHeight="24">
   <path
       android:pathData="M5,7.766c0,-1.554 1.696,-2.515 3.029,-1.715l7.056,4.234c1.295,0.777 1.295,2.653 0,3.43l-7.056,4.234c-1.333,0.8 -3.029,-0.16 -3.029,-1.715V7.766zM14.056,12L7,7.766v8.468L14.056,12zM18,6a1,1 0,0 0,-1 1v10a1,1 0,1 0,2 0V7a1,1 0,0 0,-1 -1z"
-      android:fillColor="@color/textColor"
+      android:fillColor="?attr/colorPrimary"
       android:fillType="evenOdd"/>
 </vector>

app/src/main/res/drawable/pause.xml

@@ -5,8 +5,8 @@
     android:viewportHeight="24">
   <path
       android:pathData="M2,6C2,4.114 2,3.172 2.586,2.586C3.172,2 4.114,2 6,2C7.886,2 8.828,2 9.414,2.586C10,3.172 10,4.114 10,6V18C10,19.886 10,20.828 9.414,21.414C8.828,22 7.886,22 6,22C4.114,22 3.172,22 2.586,21.414C2,20.828 2,19.886 2,18V6Z"
-      android:fillColor="@color/textColor"/>
+      android:fillColor="?attr/colorPrimary"/>
   <path
       android:pathData="M14,6C14,4.114 14,3.172 14.586,2.586C15.172,2 16.114,2 18,2C19.886,2 20.828,2 21.414,2.586C22,3.172 22,4.114 22,6V18C22,19.886 22,20.828 21.414,21.414C20.828,22 19.886,22 18,22C16.114,22 15.172,22 14.586,21.414C14,20.828 14,19.886 14,18V6Z"
-      android:fillColor="@color/textColor"/>
+      android:fillColor="?attr/colorPrimary"/>
 </vector>

app/src/main/res/drawable/play.xml

@@ -1,8 +1,5 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:height="24dp"
-    android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:viewportHeight="512" android:viewportWidth="512" android:width="24dp">
       
-    <path android:fillColor="@color/textColor"
-        android:pathData="M21.409,9.353C23.531,10.507 23.531,13.493 21.409,14.647L8.597,21.615C6.534,22.736 4,21.276 4,18.967L4,5.033C4,2.724 6.534,1.264 8.597,2.385L21.409,9.353Z"/>
+    <path android:fillColor="?attr/colorPrimary" android:pathData="M464.7,221.5L86.1,7.3C52.5,-11.7 25,7.5 25,50v412c0,42.5 27.5,61.7 61.1,42.7l378.6,-214.1C498.2,271.5 498.2,240.5 464.7,221.5z"/>
     
 </vector>

app/src/main/res/drawable/previous.xml

@@ -5,6 +5,6 @@
     android:viewportHeight="24">
   <path
       android:pathData="M19,7.766c0,-1.554 -1.696,-2.515 -3.029,-1.715l-7.056,4.234c-1.295,0.777 -1.295,2.653 0,3.43l7.056,4.234c1.333,0.8 3.029,-0.16 3.029,-1.715V7.766zM9.944,12L17,7.766v8.468L9.944,12zM6,6a1,1 0,0 1,1 1v10a1,1 0,1 1,-2 0V7a1,1 0,0 1,1 -1z"
-      android:fillColor="@color/textColor"
+      android:fillColor="?attr/colorPrimary"
       android:fillType="evenOdd"/>
 </vector>

app/src/main/res/drawable/selected.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="1024"
+    android:viewportHeight="1024">
+  <path
+      android:pathData="M512,512m-448,0a448,448 0,1 0,896 0,448 448,0 1,0 -896,0Z"
+      android:fillColor="#00ffffff"/>
+  <path
+      android:pathData="M738.1,311.5L448,601.6l-119.5,-119.5 -59.7,59.7 179.2,179.2 349.9,-349.9z"
+      android:fillColor="@color/black"/>
+</vector>

app/src/main/res/drawable/video_add.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M16,4c0.552,0 1,0.448 1,1v4.2l5.213,-3.65c0.226,-0.158 0.538,-0.103 0.697,0.124 0.058,0.084 0.09,0.184 0.09,0.286v12.08c0,0.276 -0.224,0.5 -0.5,0.5 -0.103,0 -0.203,-0.032 -0.287,-0.09L17,14.8V19c0,0.552 -0.448,1 -1,1H2c-0.552,0 -1,-0.448 -1,-1V5c0,-0.552 0.448,-1 1,-1h14zM8,8v3H5v2h2.999L8,16h2l-0.001,-3H13v-2h-3V8H8z"/>
+</vector>

app/src/main/res/drawable/wrong.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="256"
+    android:viewportHeight="256">
+  <path
+      android:pathData="M142,128l49,-49a9.9,9.9 0,0 0,-14 -14L128,114 79,65A9.9,9.9 0,0 0,65 79l49,49L65,177a9.9,9.9 0,0 0,14 14l49,-49 49,49a9.9,9.9 0,0 0,14 -14Z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/layout/activity_audio_gallery.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/main"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".activities.AudioGalleryActivity">
-
-</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_change_password.xml

@@ -5,74 +5,86 @@
     android:id="@+id/main"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:padding="16dp"
     tools:context=".activities.SetupPasswordActivity">
 
-    <com.google.android.material.textview.MaterialTextView
-        android:id="@+id/tvTitle"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Change Password"
-        android:textSize="24sp"
-        android:textStyle="bold"
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:gravity="center_horizontal"
+        android:orientation="vertical"
+        android:padding="18dp"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent">
 
-    <com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/tilOldPassword"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="32dp"
-        android:hint="Enter Old Password"
-        app:endIconMode="password_toggle"
-        app:layout_constraintTop_toBottomOf="@id/tvTitle">
+        <com.google.android.material.textview.MaterialTextView
+            android:id="@+id/tvTitle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/change_password"
+            android:textSize="24sp"
+            android:textStyle="bold"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
 
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/etOldPassword"
+        <com.google.android.material.textfield.TextInputLayout
+            android:id="@+id/tilOldPassword"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:imeOptions="actionNext"
-            android:singleLine="true"
-            android:inputType="number" />
-    </com.google.android.material.textfield.TextInputLayout>
+            android:layout_marginTop="32dp"
+            android:hint="@string/enter_old_password"
+            app:endIconMode="password_toggle"
+            app:layout_constraintTop_toBottomOf="@id/tvTitle">
 
-    <com.google.android.material.textfield.TextInputLayout
-        android:id="@+id/tilNewPassword"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="16dp"
-        android:hint="Enter New Password"
-        app:endIconMode="password_toggle"
-        app:layout_constraintTop_toBottomOf="@id/tilOldPassword">
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/etOldPassword"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:imeOptions="actionNext"
+                android:inputType="number"
+                android:singleLine="true" />
+        </com.google.android.material.textfield.TextInputLayout>
 
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/etNewPassword"
+        <com.google.android.material.textfield.TextInputLayout
+            android:id="@+id/tilNewPassword"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:imeOptions="actionNext"
-            android:singleLine="true"
-            android:inputType="number" />
-    </com.google.android.material.textfield.TextInputLayout>
+            android:layout_marginTop="16dp"
+            android:hint="@string/enter_new_password"
+            app:endIconMode="password_toggle"
+            app:layout_constraintTop_toBottomOf="@id/tilOldPassword">
 
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/btnChangePassword"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="32dp"
-        android:padding="12dp"
-        android:text="Change Password"
-        app:layout_constraintTop_toBottomOf="@id/tilNewPassword" />
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/etNewPassword"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:imeOptions="actionNext"
+                android:inputType="number"
+                android:singleLine="true" />
+        </com.google.android.material.textfield.TextInputLayout>
 
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/btnResetPassword"
-        style="@style/Widget.MaterialComponents.Button.TextButton"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="8dp"
-        android:text="Forgot Password?"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/btnChangePassword" />
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btnChangePassword"
+            android:layout_width="match_parent"
+            android:layout_height="50dp"
+            android:layout_marginTop="32dp"
+            android:padding="12dp"
+            android:text="@string/change_password"
+            app:layout_constraintTop_toBottomOf="@id/tilNewPassword" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btnResetPassword"
+            style="@style/Widget.MaterialComponents.Button.TextButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:text="@string/forgot_password"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/btnChangePassword" />
+
+    </LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_documents.xml

@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/main"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".activities.DocumentsActivity">
-
-</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_gallery.xml

@@ -1,39 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-
-    android:layout_height="match_parent">
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recyclerView"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:padding="8dp" />
-
-<!--    <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton-->
-<!--        android:id="@+id/fabAdd"-->
-<!--        android:layout_width="wrap_content"-->
-<!--        android:layout_height="wrap_content"-->
-<!--        android:layout_gravity="bottom|end"-->
-<!--        android:layout_margin="16dp"-->
-<!--        android:contentDescription="Compose"-->
-<!--        android:icon="@drawable/plus"-->
-<!--        android:text="Add File"-->
-<!--        app:elevation="6dp"/>-->
-
-    <com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
-        android:id="@+id/fabAdd"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
-        android:layout_marginEnd="25dp"
-        android:layout_marginBottom="35dp"
-        android:contentDescription="Compose"
-        app:iconPadding="8dp"
-        app:icon="@android:drawable/ic_input_add"
-        android:text="Add file"/>
-
-
-</androidx.coordinatorlayout.widget.CoordinatorLayout> 

app/src/main/res/layout/activity_gallery_base.xml

@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recyclerView"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:padding="8dp" />
-
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/fabAdd"
-        android:layout_width="60dp"
-        android:layout_height="60dp"
-        android:layout_gravity="bottom|end"
-        android:layout_marginEnd="25dp"
-        android:layout_marginBottom="35dp"
-        android:src="@android:drawable/ic_input_add" />
-
-</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout/activity_hidden.xml

@@ -0,0 +1,145 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/main"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".activities.HiddenActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="?attr/actionBarSize"
+        android:gravity="center_vertical"
+        android:orientation="horizontal"
+        android:padding="8dp"
+        android:id="@+id/toolBar"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.appcompat.widget.AppCompatImageButton
+            android:layout_width="40dp"
+            android:layout_height="40dp"
+            android:src="@drawable/ic_back"
+            app:tint="@color/svgTintColor"
+            android:scaleType="fitCenter"
+            android:background="#00000000"
+            android:padding="8dp"
+            android:id="@+id/back"/>
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:text="@string/hidden_space"
+            android:textSize="22sp"
+            android:singleLine="true"
+            android:padding="4dp"
+            android:textStyle="bold"
+            android:layout_weight="1"
+            android:id="@+id/folderName"/>
+
+        <com.google.android.material.button.MaterialButton
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:icon="@drawable/ic_edit"
+            style="@style/Widget.Material3.Button.IconButton"
+            android:id="@+id/edit"/>
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/delete"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:icon="@drawable/ic_delete"
+            style="@style/Widget.Material3.Button.IconButton" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/menuButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:icon="@drawable/ic_more"
+            style="@style/Widget.Material3.Button.IconButton"/>
+
+        <com.google.android.material.button.MaterialButton
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:icon="@drawable/ic_list"
+            style="@style/Widget.Material3.Button.IconButton"
+            android:id="@+id/folderOrientation"/>
+        <com.google.android.material.button.MaterialButton
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:icon="@drawable/ic_settings"
+            style="@style/Widget.Material3.Button.IconButton"
+            android:id="@+id/settings"/>
+    </LinearLayout>
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recyclerView"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/toolBar">
+
+    </androidx.recyclerview.widget.RecyclerView>
+
+    <LinearLayout
+        android:id="@+id/noItems"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:orientation="vertical"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <ImageView
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:src="@drawable/ic_no_items" />
+
+        <TextView
+            android:id="@+id/noItemsTxt"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:gravity="center"
+            android:padding="10dp"
+            android:text="@string/there_is_no_folders_available_create_one_by_clicking_on_the_add_folder_button_showing_in_the_bottom"
+            android:textSize="16sp" />
+
+    </LinearLayout>
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/addFolder"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:src="@drawable/ic_folder_add"
+        android:text="@string/add_image"
+        android:backgroundTint="?attr/colorPrimary"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="16dp"
+        app:tint="@color/white"
+        android:layout_marginBottom="20dp"
+        app:fabCustomSize="57dp" />
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/deleteSelected"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:src="@drawable/ic_delete"
+        android:visibility="gone"
+        app:tint="@color/white"
+        android:backgroundTint="?attr/colorPrimary"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="20dp"
+        app:fabCustomSize="57dp" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_hidden_vault.xml

@@ -1,121 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:gravity="center"
-    android:orientation="vertical"
-    android:padding="16dp">
-
-    <LinearLayout
-        android:id="@+id/linearLayout"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_weight="2"
-        android:minHeight="300dp"
-        android:orientation="vertical"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent">
-
-    </LinearLayout>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_weight="1"
-        android:gravity="center_horizontal|bottom"
-        android:orientation="horizontal">
-
-        <com.google.android.material.card.MaterialCardView
-            android:id="@+id/btnImages"
-            android:layout_width="150dp"
-            android:layout_height="150dp"
-            android:layout_margin="8dp"
-            app:cardCornerRadius="12dp"
-            app:layout_constraintBottom_toTopOf="@id/btnAudio"
-            app:layout_constraintEnd_toStartOf="@id/btnVideos"
-            app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@+id/linearLayout">
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="Images"
-                android:textSize="18sp"
-                android:textStyle="bold" />
-        </com.google.android.material.card.MaterialCardView>
-
-        <com.google.android.material.card.MaterialCardView
-            android:id="@+id/btnVideos"
-            android:layout_width="150dp"
-            android:layout_height="150dp"
-            android:layout_margin="8dp"
-            app:cardCornerRadius="12dp"
-            app:layout_constraintBottom_toTopOf="@id/btnDocs"
-            app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintStart_toEndOf="@id/btnImages"
-            app:layout_constraintTop_toBottomOf="@+id/linearLayout">
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="Videos"
-                android:textSize="18sp"
-                android:textStyle="bold" />
-        </com.google.android.material.card.MaterialCardView>
-    </LinearLayout>
-
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_weight="1"
-        android:gravity="center_horizontal|top"
-        android:orientation="horizontal">
-
-        <com.google.android.material.card.MaterialCardView
-            android:id="@+id/btnAudio"
-            android:layout_width="150dp"
-            android:layout_height="150dp"
-            android:layout_margin="8dp"
-            app:cardCornerRadius="12dp"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintEnd_toStartOf="@id/btnDocs"
-            app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/btnImages">
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="Audio"
-                android:textSize="18sp"
-                android:textStyle="bold" />
-        </com.google.android.material.card.MaterialCardView>
-
-        <com.google.android.material.card.MaterialCardView
-            android:id="@+id/btnDocs"
-            android:layout_width="150dp"
-            android:layout_height="150dp"
-            android:layout_margin="8dp"
-            app:cardCornerRadius="12dp"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintEnd_toEndOf="parent"
-            app:layout_constraintStart_toEndOf="@id/btnAudio"
-            app:layout_constraintTop_toBottomOf="@id/btnVideos">
-
-            <TextView
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_gravity="center"
-                android:text="Documents"
-                android:textSize="18sp"
-                android:textStyle="bold" />
-        </com.google.android.material.card.MaterialCardView>
-    </LinearLayout>
-
-
-</LinearLayout>