✨

app/src/main/AndroidManifest.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="devs.org.calculator"
+    >
 
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"
         android:maxSdkVersion="32" />
@@ -17,6 +19,7 @@
     <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"

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

@@ -7,11 +7,9 @@ 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 devs.org.calculator.utils.FileProcessCallback
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import java.io.File
 
 class AudioGalleryActivity : BaseGalleryActivity(), FileProcessCallback {

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

@@ -7,12 +7,9 @@ import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.activities.AudioGalleryActivity
 import devs.org.calculator.utils.FileManager
-import devs.org.calculator.utils.FileProcessCallback
+import devs.org.calculator.callbacks.FileProcessCallback
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import java.io.File
 
 class DocumentsActivity : BaseGalleryActivity(), FileProcessCallback {

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

@@ -15,13 +15,10 @@ import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import devs.org.calculator.utils.FileManager
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import java.io.File
 import android.Manifest
-import devs.org.calculator.activities.AudioGalleryActivity
+import devs.org.calculator.callbacks.FileProcessCallback
-import devs.org.calculator.utils.FileProcessCallback
 
 class ImageGalleryActivity : BaseGalleryActivity(), FileProcessCallback  {
     override val fileType = FileManager.FileType.IMAGE

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

@@ -3,25 +3,38 @@ package devs.org.calculator.activities
 import android.app.Activity
 import android.content.Context
 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.util.Log
+import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AppCompatActivity
 import com.google.android.material.button.MaterialButton
+import devs.org.calculator.R
+import devs.org.calculator.callbacks.DialogActionsCallback
 import devs.org.calculator.databinding.ActivityMainBinding
+import devs.org.calculator.utils.DialogUtil
+import devs.org.calculator.utils.FileManager
 import devs.org.calculator.utils.PrefsUtil
 import net.objecthunter.exp4j.ExpressionBuilder
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), DialogActionsCallback {
     private lateinit var binding: ActivityMainBinding
     private var currentExpression = "0"
     private var lastWasOperator = false
     private var hasDecimal = false
     private lateinit var launcher: ActivityResultLauncher<Intent>
     private lateinit var baseDocumentTreeUri: Uri
+    private val dialogUtil = DialogUtil(this)
+    private val fileManager = FileManager(this, this)
 
+    @RequiresApi(Build.VERSION_CODES.R)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
@@ -32,8 +45,18 @@ class MainActivity : AppCompatActivity() {
             handleActivityResult(result)
         }
 
-        // Ask for base directory picker on startup
+        // 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
+            )
+        }
         // Number buttons
         setupNumberButton(binding.btn0, "0")
         setupNumberButton(binding.btn1, "1")
@@ -60,13 +83,8 @@ class MainActivity : AppCompatActivity() {
         binding.cut.setOnClickListener { cutNumbers() }
     }
 
-    private fun launchBaseDirectoryPicker() {
-        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
-        launcher.launch(intent)
-    }
-
     private fun handleActivityResult(result: androidx.activity.result.ActivityResult) {
-        if (result.resultCode == Activity.RESULT_OK) {
+        if (result.resultCode == RESULT_OK) {
             result.data?.data?.let { uri ->
                 baseDocumentTreeUri = uri
                 val takeFlags = Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
@@ -74,7 +92,7 @@ class MainActivity : AppCompatActivity() {
                 // Take persistable Uri Permission for future use
                 contentResolver.takePersistableUriPermission(uri, takeFlags)
 
-                val preferences = getSharedPreferences("com.example.fileutility", Context.MODE_PRIVATE)
+                val preferences = getSharedPreferences("com.example.fileutility", MODE_PRIVATE)
                 preferences.edit().putString("filestorageuri", uri.toString()).apply()
             }
         } else {
@@ -126,7 +144,7 @@ class MainActivity : AppCompatActivity() {
             currentExpression = (value / 100).toString()
             updateDisplay()
         } catch (e: Exception) {
-            binding.display.text = "Error"
+            binding.display.text = getString(R.string.invalid_message)
         }
     }
 
@@ -163,7 +181,7 @@ class MainActivity : AppCompatActivity() {
             hasDecimal = currentExpression.contains(".")
             updateDisplay()
         } catch (e: Exception) {
-            binding.display.text = "Invalid Value"
+            binding.display.text = getString(R.string.invalid_message)
         }
     }
 
@@ -180,6 +198,29 @@ class MainActivity : AppCompatActivity() {
         updateDisplay()
 
     }
+
+    override fun onPositiveButtonClicked() {
+        fileManager.askPermission(this)
+    }
+
+    override fun onNegativeButtonClicked() {
+
+    }
+
+    override fun onNaturalButtonClicked() {
+
+    }
+
+    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()
+            } else {
+                Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
 }
 
 

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

@@ -69,12 +69,11 @@ class PreviewActivity : AppCompatActivity() {
 
         val fileUri = Uri.fromFile(files[currentPosition])
         val fileName = FileManager.FileName(this).getFileNameFromUri(fileUri).toString()
-        binding.title.text = fileName
     }
 
     private fun clickListeners() {
         binding.delete.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUri(this, files[binding.viewPager.currentItem])
+            val fileUri = FileManager.FileManager().getContentUri(this, files[binding.viewPager.currentItem], filetype)
             if (fileUri != null) {
                 MaterialAlertDialogBuilder(this)
                     .setTitle("Delete File")
@@ -94,7 +93,7 @@ class PreviewActivity : AppCompatActivity() {
         }
 
         binding.unHide.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUri(this, files[binding.viewPager.currentItem])
+            val fileUri = FileManager.FileManager().getContentUri(this, files[binding.viewPager.currentItem], filetype)
             if (fileUri != null) {
                 MaterialAlertDialogBuilder(this)
                     .setTitle("Unhide File")

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

@@ -2,9 +2,15 @@ package devs.org.calculator.activities
 
 import android.content.Intent
 import android.os.Bundle
+import android.view.LayoutInflater
+import android.widget.TextView
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import com.google.android.material.textfield.TextInputEditText
 import devs.org.calculator.databinding.ActivitySetupPasswordBinding
 import devs.org.calculator.utils.PrefsUtil
+import devs.org.calculator.R
 
 class SetupPasswordActivity : AppCompatActivity() {
     private lateinit var binding: ActivitySetupPasswordBinding
@@ -19,19 +25,76 @@ class SetupPasswordActivity : AppCompatActivity() {
         binding.btnSavePassword.setOnClickListener {
             val password = binding.etPassword.text.toString()
             val confirmPassword = binding.etConfirmPassword.text.toString()
+            val securityQuestion = binding.etSecurityQuestion.text.toString()
+            val securityAnswer = binding.etSecurityAnswer.text.toString()
 
-            if (password == confirmPassword && password.isNotEmpty()) {
+            if (password.isEmpty()){
+                binding.etPassword.error = "Enter password"
+                return@setOnClickListener
+            }
+            if (confirmPassword.isEmpty()){
+                binding.etConfirmPassword.error = "Confirm password"
+                return@setOnClickListener
+            }
+            if (securityQuestion.isEmpty()){
+                binding.etSecurityQuestion.error = "Enter security question"
+                return@setOnClickListener
+            }
+            if (securityAnswer.isEmpty()){
+                binding.etSecurityAnswer.error = "Enter security answer"
+                return@setOnClickListener
+            }
+            if (password != confirmPassword) {
+                binding.etPassword.error = "Passwords don't match"
+                return@setOnClickListener
+            }
             prefsUtil.savePassword(password)
+            prefsUtil.saveSecurityQA(securityQuestion, securityAnswer)
+            Toast.makeText(this, "Password set successfully", Toast.LENGTH_SHORT).show()
             startActivity(Intent(this, MainActivity::class.java))
             finish()
-            } else {
-                binding.etPassword.error = "Passwords don't match"
-            }
         }
 
         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()
+
+        }
+
+    }
+
+    private fun showSecurityQuestionDialog(securityQuestion: String) {
+        val dialogView = LayoutInflater.from(this).inflate(R.layout.dialog_security_question, null)
+
+        val questionTextView: TextView = dialogView.findViewById(R.id.security_question)
+        questionTextView.text = securityQuestion
+
+        MaterialAlertDialogBuilder(this)
+            .setTitle("Answer the Security Question!")
+            .setView(dialogView)
+            .setPositiveButton("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()
+                } else {
+                    if (prefsUtil.validateSecurityAnswer(userAnswer)){
+                        prefsUtil.resetPassword()
+                        Toast.makeText(this, "Password successfully reset.", Toast.LENGTH_SHORT).show()
+                        dialog.dismiss()
+                    }else {
+                        Toast.makeText(this, "Invalid answer!", Toast.LENGTH_SHORT).show()
+                    }
+
                 }
             }
+            .setNegativeButton("Cancel") { dialog, _ ->
+
+                dialog.dismiss()
+            }
+            .show()
+    }
 }

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

@@ -7,12 +7,9 @@ import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.activities.ImageGalleryActivity
 import devs.org.calculator.utils.FileManager
-import devs.org.calculator.utils.FileProcessCallback
+import devs.org.calculator.callbacks.FileProcessCallback
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import java.io.File
 
 class VideoGalleryActivity : BaseGalleryActivity(), FileProcessCallback {

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

@@ -7,6 +7,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
+import android.widget.Toast
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.DiffUtil
@@ -33,6 +34,7 @@ class FileAdapter(private val fileType: FileManager.FileType, var context: Conte
         private val imageView: ImageView = view.findViewById(R.id.imageView)
 
         fun bind(file: File) {
+
             when (fileType) {
                 FileManager.FileType.IMAGE -> {
                     Glide.with(imageView)
@@ -58,6 +60,7 @@ class FileAdapter(private val fileType: FileManager.FileType, var context: Conte
             }
             itemView.setOnClickListener {
 
+
                 var fileTypes = when(fileType){
 
                     FileManager.FileType.IMAGE -> {
@@ -80,38 +83,39 @@ class FileAdapter(private val fileType: FileManager.FileType, var context: Conte
 
             }
             itemView.setOnLongClickListener {
+                val fileUri = FileManager.FileManager().getContentUri(context, file, fileType)
+                if (fileUri == null) {
+                    Toast.makeText(context, "Unable to access file: $file", Toast.LENGTH_SHORT).show()
+                    return@setOnLongClickListener true
+                }
 
-                val fileUri = FileManager.FileManager().getContentUri(context, file)
+                val fileName = FileManager.FileName(context).getFileNameFromUri(fileUri)?.toString() ?: "Unknown File"
-                val filesName = FileManager.FileName(context).getFileNameFromUri(fileUri!!).toString()
 
                 MaterialAlertDialogBuilder(context)
                     .setTitle("Details")
-                    .setMessage("File Name: $filesName\n\nYou can delete or Unhide this file.")
+                    .setMessage("File Name: $fileName\n\nYou can delete or unhide this file.")
                     .setPositiveButton("Delete") { dialog, _ ->
-                        // Handle positive button click
                         lifecycleOwner.lifecycleScope.launch {
-                            FileManager(context, context as LifecycleOwner).deletePhotoFromExternalStorage(fileUri)
+                            FileManager(context, lifecycleOwner).deletePhotoFromExternalStorage(fileUri)
                         }
-
                         val currentList = currentList.toMutableList()
                         currentList.remove(file)
                         submitList(currentList)
                         dialog.dismiss()
                     }
                     .setNegativeButton("Unhide") { dialog, _ ->
-                        // Handle negative button click
+                        FileManager(context, lifecycleOwner).copyFileToNormalDir(fileUri)
-                        FileManager(context, context as LifecycleOwner).copyFileToNormalDir(fileUri)
                         val currentList = currentList.toMutableList()
                         currentList.remove(file)
                         submitList(currentList)
                         dialog.dismiss()
-                        dialog.dismiss()
                     }
                     .show()
 
                 return@setOnLongClickListener true
             }
 
+
         }
     }
 
@@ -137,4 +141,6 @@ class FileAdapter(private val fileType: FileManager.FileType, var context: Conte
             return oldItem == newItem
         }
     }
+
+
 }

app/src/main/java/devs/org/calculator/callbacks/DialogActionsCallback.kt

@@ -0,0 +1,7 @@
+package devs.org.calculator.callbacks
+
+interface DialogActionsCallback {
+    fun onPositiveButtonClicked()
+    fun onNegativeButtonClicked()
+    fun onNaturalButtonClicked()
+}

app/src/main/java/devs/org/calculator/callbacks/FileProcessCallback.kt

@@ -1,4 +1,4 @@
-package devs.org.calculator.utils
+package devs.org.calculator.callbacks
 
 import java.io.File
 

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

@@ -10,29 +10,36 @@ import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.IntentSenderRequest
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.LifecycleOwner
-import androidx.lifecycle.lifecycleScope
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import devs.org.calculator.callbacks.DialogActionsCallback
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
-class DialogUtil(private val context: Context, private var lifecycleOwner: LifecycleOwner) {
+class DialogUtil(private val context: Context) {
     private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
-    fun showMaterialDialog(
+    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()
@@ -42,80 +49,20 @@ class DialogUtil(private val context: Context, private var lifecycleOwner: Lifec
         message: String,
         positiveButton: String,
         negativeButton: String,
-        uri: Uri
+        callback: DialogActionsCallback
     ) {
         MaterialAlertDialogBuilder(context)
             .setTitle(title)
             .setMessage(message)
             .setPositiveButton(positiveButton) { dialog, _ ->
                 // Handle positive button click
-                if (positiveButton == "Delete") {
+                callback.onPositiveButtonClicked()
-                    lifecycleOwner.lifecycleScope.launch {
-                        deletePhotoFromExternalStorage(uri)
-                    }
-                }else{
-                    // copy file to a visible directory
-
-                }
             }
             .setNegativeButton(negativeButton) { dialog, _ ->
                 // Handle negative button click
+                callback.onNegativeButtonClicked()
                 dialog.dismiss()
             }
             .show()
     }
-
-    suspend fun deletePhotoFromExternalStorage(photoUri: Uri) {
-        withContext(Dispatchers.IO) {
-            try {
-                // First try to delete using DocumentFile
-                val documentFile = DocumentFile.fromSingleUri(context, photoUri)
-                if (documentFile?.exists() == true && documentFile.canWrite()) {
-                    val deleted = documentFile.delete()
-                    withContext(Dispatchers.Main) {
-                        if (deleted) {
-//                            Toast.makeText(context, "File deleted successfully", Toast.LENGTH_SHORT).show()
-                        } else {
-                            Toast.makeText(context, "Failed to delete file", Toast.LENGTH_SHORT).show()
-                        }
-                    }
-                    return@withContext
-                }
-
-                // If DocumentFile approach fails, try content resolver
-                try {
-                    context.contentResolver.delete(photoUri, null, null)
-                    withContext(Dispatchers.Main) {
-                        Toast.makeText(context, "File deleted successfully", Toast.LENGTH_SHORT).show()
-                    }
-                } catch (e: SecurityException) {
-                    // Handle security exception for Android 10 and above
-                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-                        val intentSender = when {
-                            Build.VERSION.SDK_INT >= Build.VERSION_CODES.R -> {
-                                MediaStore.createDeleteRequest(context.contentResolver, listOf(photoUri)).intentSender
-                            }
-                            else -> {
-                                val recoverableSecurityException = e as? RecoverableSecurityException
-                                recoverableSecurityException?.userAction?.actionIntent?.intentSender
-                            }
-                        }
-                        intentSender?.let { sender ->
-                            intentSenderLauncher.launch(
-                                IntentSenderRequest.Builder(sender).build()
-                            )
-                        }
-                    }
-                }
-            } catch (e: Exception) {
-                withContext(Dispatchers.Main) {
-                    Toast.makeText(
-                        context,
-                        "Error deleting file: ${e.message}",
-                        Toast.LENGTH_LONG
-                    ).show()
-                }
-            }
-        }
-    }
 }

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

@@ -1,31 +1,33 @@
 package devs.org.calculator.utils
 
+import android.app.Activity
 import android.app.RecoverableSecurityException
+import android.content.ActivityNotFoundException
 import android.content.Context
 import android.content.Intent
 import android.net.Uri
 import android.os.Build
 import android.os.Environment
-import android.provider.ContactsContract
-import android.provider.ContactsContract.Directory
-import android.provider.DocumentsContract
 import android.provider.MediaStore
+import android.provider.Settings
 import android.webkit.MimeTypeMap
 import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.activity.result.IntentSenderRequest
+import androidx.core.app.ActivityCompat
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.LifecycleOwner
 import androidx.lifecycle.lifecycleScope
-import devs.org.calculator.activities.VideoGalleryActivity
+import devs.org.calculator.callbacks.FileProcessCallback
-import devs.org.calculator.adapters.FileAdapter
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
+import android.Manifest
 
 class FileManager(private val context: Context, private val lifecycleOwner: LifecycleOwner) {
     private lateinit var intentSenderLauncher: ActivityResultLauncher<IntentSenderRequest>
+    val intent = Intent()
 
     companion object {
         const val HIDDEN_DIR = ".CalculatorHide"
@@ -222,7 +224,9 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
 
     }
     class FileManager(){
-        fun getContentUri(context: Context, file: File): Uri? {
+        fun getContentUri(context: Context, file: File, fileType: FileType): Uri? {
+            when(fileType){
+                FileType.IMAGE -> {
                     val projection = arrayOf(MediaStore.MediaColumns._ID)
                     val selection = "${MediaStore.MediaColumns.DATA} = ?"
                     val selectionArgs = arrayOf(file.absolutePath)
@@ -236,7 +240,83 @@ class FileManager(private val context: Context, private val lifecycleOwner: Life
                     }
                     return null
                 }
+
+                FileType.VIDEO -> {
+                    val projection = arrayOf(MediaStore.Video.Media._ID)
+                    val selection = "${MediaStore.Video.Media.DATA} = ?"
+                    val selectionArgs = arrayOf(file.absolutePath)
+                    val queryUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
+
+                    context.contentResolver.query(queryUri, projection, selection, selectionArgs, null)?.use { cursor ->
+                        if (cursor.moveToFirst()) {
+                            val id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID))
+                            return Uri.withAppendedPath(queryUri, id.toString())
                         }
+                    }
+                    return null
+                }
+                FileType.AUDIO -> {
+                    val projection = arrayOf(MediaStore.Audio.Media._ID)
+                    val selection = "${MediaStore.Audio.Media.DATA} = ?"
+                    val selectionArgs = arrayOf(file.absolutePath)
+                    val queryUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
+
+                    context.contentResolver.query(queryUri, projection, selection, selectionArgs, null)?.use { cursor ->
+                        if (cursor.moveToFirst()) {
+                            val id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID))
+                            return Uri.withAppendedPath(queryUri, id.toString())
+                        }
+                    }
+                    return null
+                }
+                FileType.DOCUMENT -> {
+                    val projection = arrayOf(MediaStore.Files.FileColumns._ID)
+                    val selection = "${MediaStore.Files.FileColumns.DATA} = ?"
+                    val selectionArgs = arrayOf(file.absolutePath)
+                    val queryUri = MediaStore.Files.getContentUri("external")
+
+                    context.contentResolver.query(queryUri, projection, selection, selectionArgs, null)?.use { cursor ->
+                        if (cursor.moveToFirst()) {
+                            val id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID))
+                            return Uri.withAppendedPath(queryUri, id.toString())
+                        }
+                    }
+
+                    return null
+                }
+            }
+
+        }
+    }
+
+
+    fun askPermission(activity: Activity) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            if (!Environment.isExternalStorageManager()) {
+                val intent = Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION)
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                try {
+                    activity.startActivity(intent)
+                } 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
+            ActivityCompat.requestPermissions(
+                activity,
+                arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE,
+                    Manifest.permission.READ_EXTERNAL_STORAGE),
+                6767
+            )
+        }
+    }
+
+
+
+
 
 
     suspend fun processMultipleFiles(

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

@@ -18,6 +18,14 @@ class PrefsUtil(context: Context) {
             .apply()
     }
 
+    fun resetPassword(){
+        prefs.edit()
+            .remove("password")
+            .remove("security_question")
+            .remove("security_answer")
+            .apply()
+    }
+
     fun validatePassword(input: String): Boolean {
         val stored = prefs.getString("password", "") ?: ""
         return stored == hashPassword(input)

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

@@ -12,260 +12,283 @@
     <TextView
         android:id="@+id/display"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="160dp"
         android:layout_margin="16dp"
-        android:layout_weight="2"
+        android:layout_weight="3"
         android:layout_marginTop="0dp"
-        android:background="#00000000"
         android:elevation="4dp"
         android:gravity="end|bottom"
         android:padding="10dp"
         android:text="0"
         android:textSize="48sp"
+        android:autoSizeTextType="uniform"
+        android:autoSizeMinTextSize="20sp"
+        android:autoSizeMaxTextSize="48sp"
+        android:autoSizeStepGranularity="2sp"
         tools:ignore="Suspicious0dp" />
 
 
+
+
     <!-- Calculator Buttons -->
     <GridLayout
         android:layout_width="match_parent"
-        android:layout_height="0dp"
+        android:layout_height="wrap_content"
         android:layout_margin="8dp"
         android:columnCount="4"
-        android:layout_weight="5"
+        android:layout_weight="4"
         android:rowCount="5">
 
         <!-- Row 1 -->
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnClear"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:textSize="30sp"
             android:text="C"
+            app:layout_constraintDimensionRatio="1:1"
             app:cornerRadius="15dp"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnPercent"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="%"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnDivide"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="÷"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/cut"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             app:icon="@drawable/backspace"
-
+            app:layout_constraintDimensionRatio="1:1"
             app:iconSize="30dp"
             app:cornerRadius="15dp"/>
         <!-- Row 2 -->
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn7"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="7"
+            app:layout_constraintDimensionRatio="1:1"
             app:cornerRadius="15dp"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn8"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="8"
+            app:layout_constraintDimensionRatio="1:1"
             app:cornerRadius="15dp"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn9"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:textSize="30sp"
             android:text="9"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnMultiply"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:textSize="30sp"
             android:text="×"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button"/>
 
         <!-- Row 3 -->
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn4"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             app:cornerRadius="15dp"
             android:text="4"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn5"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="5"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn6"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="6"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnMinus"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="-"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button"/>
 
         <!-- Row 4 -->
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn1"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="1"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn2"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:textSize="30sp"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:text="2"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn3"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:textSize="30sp"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:text="3"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnPlus"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="+"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button"/>
 
         <!-- Row 5 -->
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btn0"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnSpan="2"
             android:textSize="30sp"
             android:layout_columnWeight="2"
             android:layout_margin="4dp"
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             android:text="0" />
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnDot"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:layout_columnWeight="1"
             android:textSize="30sp"
             android:layout_margin="4dp"
             android:text="."
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
 
         <com.google.android.material.button.MaterialButton
             android:id="@+id/btnEquals"
-            android:layout_width="0dp"
+            android:layout_width="70dp"
-            android:layout_height="0dp"
+            android:layout_height="70dp"
             android:layout_rowWeight="1"
             android:textSize="30sp"
             android:layout_columnWeight="1"
             android:layout_margin="4dp"
             android:text="="
             app:cornerRadius="15dp"
+            app:layout_constraintDimensionRatio="1:1"
             style="@style/Widget.MaterialComponents.Button"/>
 
     </GridLayout>

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

@@ -0,0 +1,31 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <!-- Security Question -->
+    <TextView
+        android:id="@+id/security_question"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Security Question"
+        android:textSize="16sp"
+        android:layout_marginLeft="10dp"
+        android:layout_marginBottom="8dp" />
+
+    <!-- User Answer Input -->
+    <com.google.android.material.textfield.TextInputLayout
+        android:id="@+id/text_input_layout"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="Your Answer">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/text_input_edit_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+    </com.google.android.material.textfield.TextInputLayout>
+</LinearLayout>

app/src/main/res/values/strings.xml

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">Calculator</string>
+    <string name="invalid_message">Invalid Value Entered</string>
 </resources>