Changes For Folder Feature

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": 4,
+      "versionName": "1.3",
+      "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

@@ -66,6 +66,10 @@
                 android:name="android.support.FILE_PROVIDER_PATHS"
                 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

@@ -3,19 +3,14 @@ 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()
-        
+        val prefs = PrefsUtil(this)
-        // Initialize theme settings
-        val prefs = getSharedPreferences("app_settings", MODE_PRIVATE)
-        
-        // Apply saved theme mode
         val themeMode = prefs.getInt("theme_mode", AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
         AppCompatDelegate.setDefaultNightMode(themeMode)
-        
-        // Apply dynamic colors only if dynamic theme is enabled
         if (prefs.getBoolean("dynamic_theme", true)) {
             DynamicColors.applyToActivitiesIfAvailable(this)
         }

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

@@ -5,7 +5,6 @@ import android.os.Bundle
 import android.os.Environment
 import android.os.Handler
 import android.os.Looper
-import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.WindowManager
@@ -14,6 +13,7 @@ import android.widget.Toast
 import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.GridLayoutManager
+import com.google.android.material.color.DynamicColors
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import devs.org.calculator.R
 import devs.org.calculator.adapters.FolderAdapter
@@ -36,22 +36,20 @@ class HiddenActivity : AppCompatActivity() {
     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())
 
-    companion object {
-        private const val TAG = "HiddenActivity"
-    }
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityHiddenBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
         fileManager = FileManager(this, this)
-        folderManager = FolderManager(this)
+        folderManager = FolderManager()
         dialogUtil = DialogUtil(this)
 
+
         setupInitialUIState()
         setupClickListeners()
         setupBackPressedHandler()
@@ -100,20 +98,17 @@ class HiddenActivity : AppCompatActivity() {
         }
 
         binding.folderOrientation.setOnClickListener {
-            // Switch between grid mode and list mode
             val currentIsList = PrefsUtil(this).getBoolean("isList", false)
             val newIsList = !currentIsList
 
             if (newIsList) {
-                // Switch to list view
                 showListUI()
                 PrefsUtil(this).setBoolean("isList", true)
-                binding.folderOrientation.setImageResource(R.drawable.ic_grid)
+                binding.folderOrientation.setIconResource(R.drawable.ic_grid)
             } else {
-                // Switch to grid view
                 showGridUI()
                 PrefsUtil(this).setBoolean("isList", false)
-                binding.folderOrientation.setImageResource(R.drawable.ic_list)
+                binding.folderOrientation.setIconResource(R.drawable.ic_list)
             }
         }
     }
@@ -141,11 +136,10 @@ class HiddenActivity : AppCompatActivity() {
                     showEmptyState()
                 }
             } else {
-                Log.e(TAG, "Hidden directory is not accessible: ${hiddenDir.absolutePath}")
                 showEmptyState()
             }
         } catch (e: Exception) {
-            Log.e(TAG, "Error listing folders: ${e.message}")
+
             showEmptyState()
         }
     }
@@ -173,7 +167,6 @@ class HiddenActivity : AppCompatActivity() {
                         folderManager.createFolder(hiddenDir, newName)
                         refreshCurrentView()
                     } catch (e: Exception) {
-                        Log.e(TAG, "Error creating folder: ${e.message}")
                         Toast.makeText(
                             this@HiddenActivity,
                             "Failed to create folder",
@@ -220,11 +213,9 @@ class HiddenActivity : AppCompatActivity() {
                     showEmptyState()
                 }
             } else {
-                Log.e(TAG, "Hidden directory is not accessible: ${hiddenDir.absolutePath}")
                 showEmptyState()
             }
         } catch (e: Exception) {
-            Log.e(TAG, "Error listing folders: ${e.message}")
             showEmptyState()
         }
     }
@@ -232,8 +223,6 @@ class HiddenActivity : AppCompatActivity() {
     private fun showFolderList(folders: List<File>) {
         binding.noItems.visibility = View.GONE
         binding.recyclerView.visibility = View.VISIBLE
-
-        // Clear the existing adapter to avoid conflicts
         listFolderAdapter = null
 
         binding.recyclerView.layoutManager = GridLayoutManager(this, 2)
@@ -247,14 +236,13 @@ class HiddenActivity : AppCompatActivity() {
             onSelectionModeChanged = { isSelectionMode ->
                 handleFolderSelectionModeChange(isSelectionMode)
             },
-            onSelectionCountChanged = { selectedCount ->
+            onSelectionCountChanged = { _ ->
                 updateEditButtonVisibility()
             }
         )
         binding.recyclerView.adapter = folderAdapter
         folderAdapter?.submitList(folders)
 
-        // Ensure proper icon state for folder view
         if (folderAdapter?.isInSelectionMode() != true) {
             showFolderViewIcons()
         }
@@ -262,8 +250,6 @@ class HiddenActivity : AppCompatActivity() {
     private fun showFolderListStyle(folders: List<File>) {
         binding.noItems.visibility = View.GONE
         binding.recyclerView.visibility = View.VISIBLE
-
-        // Clear the existing adapter to avoid conflicts
         folderAdapter = null
 
         binding.recyclerView.layoutManager = GridLayoutManager(this, 1)
@@ -277,14 +263,13 @@ class HiddenActivity : AppCompatActivity() {
             onSelectionModeChanged = { isSelectionMode ->
                 handleFolderSelectionModeChange(isSelectionMode)
             },
-            onSelectionCountChanged = { selectedCount ->
+            onSelectionCountChanged = { _ ->
                 updateEditButtonVisibility()
             }
         )
         binding.recyclerView.adapter = listFolderAdapter
         listFolderAdapter?.submitList(folders)
 
-        // Ensure proper icon state for folder view
         if (listFolderAdapter?.isInSelectionMode() != true) {
             showFolderViewIcons()
         }
@@ -312,10 +297,10 @@ class HiddenActivity : AppCompatActivity() {
     private fun refreshCurrentView() {
         val isList = PrefsUtil(this).getBoolean("isList", false)
         if (isList) {
-            binding.folderOrientation.setImageResource(R.drawable.ic_grid)
+            binding.folderOrientation.setIconResource(R.drawable.ic_grid)
             listFoldersInHiddenDirectoryListStyle()
         } else {
-            binding.folderOrientation.setImageResource(R.drawable.ic_list)
+            binding.folderOrientation.setIconResource(R.drawable.ic_list)
             listFoldersInHiddenDirectory()
         }
     }
@@ -344,11 +329,11 @@ class HiddenActivity : AppCompatActivity() {
                     }
 
                     override fun onNegativeButtonClicked() {
-                        // Do nothing
+
                     }
 
                     override fun onNaturalButtonClicked() {
-                        // Do nothing
+
                     }
                 }
             )
@@ -360,7 +345,6 @@ class HiddenActivity : AppCompatActivity() {
         selectedFolders.forEach { folder ->
             if (!folderManager.deleteFolder(folder)) {
                 allDeleted = false
-                Log.e(TAG, "Failed to delete folder: ${folder.name}")
             }
         }
 
@@ -372,26 +356,20 @@ class HiddenActivity : AppCompatActivity() {
 
         Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
 
-        // Clear selection from both adapters
         folderAdapter?.clearSelection()
         listFolderAdapter?.clearSelection()
 
-        // This will trigger the selection mode change callback and show proper icons
         exitFolderSelectionMode()
 
-        // Refresh the current view based on orientation
         refreshCurrentView()
     }
 
     private fun handleBackPress() {
 
-
-        // Check if folder adapters are in selection mode
         if (folderAdapter?.onBackPressed() == true || listFolderAdapter?.onBackPressed() == true) {
             return
         }
 
-        // Handle navigation back
         if (currentFolder != null) {
             navigateBackToFolders()
         } else {
@@ -402,25 +380,18 @@ class HiddenActivity : AppCompatActivity() {
     private fun navigateBackToFolders() {
         currentFolder = null
 
-        // Clean up file adapter
-
         refreshCurrentView()
 
         binding.folderName.text = getString(R.string.hidden_space)
 
-        // Set proper icons for folder view
         showFolderViewIcons()
     }
 
     override fun onDestroy() {
         super.onDestroy()
-
-
-        // Remove any pending callbacks
         mainHandler.removeCallbacksAndMessages(null)
     }
 
-    //visibility related code
     private fun showFolderViewIcons() {
         binding.folderOrientation.visibility = View.VISIBLE
         binding.settings.visibility = View.VISIBLE
@@ -429,7 +400,6 @@ class HiddenActivity : AppCompatActivity() {
         binding.menuButton.visibility = View.GONE
         binding.addFolder.visibility = View.VISIBLE
         binding.edit.visibility = View.GONE
-        // Ensure FABs are properly managed
         if (currentFolder == null) {
 
             binding.addFolder.visibility = View.VISIBLE
@@ -442,8 +412,6 @@ class HiddenActivity : AppCompatActivity() {
         binding.deleteSelected.visibility = View.VISIBLE
         binding.menuButton.visibility = View.GONE
         binding.addFolder.visibility = View.GONE
-        
-        // Update edit button visibility based on current selection count
         updateEditButtonVisibility()
     }
     private fun exitFolderSelectionMode() {
@@ -456,7 +424,6 @@ class HiddenActivity : AppCompatActivity() {
         } else {
             enterFolderSelectionMode()
         }
-        // Always update edit button visibility when selection mode changes
         updateEditButtonVisibility()
     }
 
@@ -520,11 +487,8 @@ class HiddenActivity : AppCompatActivity() {
             }
 
             if (oldFolder.renameTo(newFolder)) {
-                // Clear selection from both adapters
                 folderAdapter?.clearSelection()
                 listFolderAdapter?.clearSelection()
-
-                // Exit selection mode
                 exitFolderSelectionMode()
 
                 refreshCurrentView()

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

@@ -9,6 +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
@@ -22,6 +23,8 @@ 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 com.google.android.material.color.DynamicColors
 
 class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.DialogCallback {
     private lateinit var binding: ActivityMainBinding
@@ -34,13 +37,14 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
     private val dialogUtil = DialogUtil(this)
     private val fileManager = FileManager(this, this)
     private val sp by lazy { getSharedPreferences("app", MODE_PRIVATE) }
+    private val prefs:PrefsUtil by lazy { PrefsUtil(this) }
 
     @RequiresApi(Build.VERSION_CODES.R)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
-
+        enableEdgeToEdge()
         launcher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
             handleActivityResult(result)
         }
@@ -49,15 +53,14 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
             binding.display.text = getString(R.string.enter_123456)
         }
 
-        // Ask permission
         if(!Environment.isExternalStorageManager()) {
             dialogUtil.showMaterialDialog(
-                "Storage Permission",
+                getString(R.string.storage_permission),
-                "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.to_ensure_the_app_works_properly_and_allows_you_to_easily_hide_or_un_hide_your_private_files_please_grant_storage_access_permission) +
                         "\n" +
-                        "For devices running Android 11 or higher, you'll need to grant the 'All Files Access' permission.",
+                        getString(R.string.for_devices_running_android_11_or_higher_you_ll_need_to_grant_the_all_files_access_permission),
-                "Grant",
+                getString(R.string.grant_permission),
-                "Later",
+                getString(R.string.later),
                 object : DialogUtil.DialogCallback {
                     override fun onPositiveButtonClicked() {
                         fileManager.askPermission(this@MainActivity)
@@ -65,19 +68,20 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
 
                     override fun onNegativeButtonClicked() {
                         Toast.makeText(this@MainActivity,
-                            "Storage permission is required for the app to function properly",
+                            getString(R.string.storage_permission_is_required_for_the_app_to_function_properly),
                             Toast.LENGTH_LONG).show()
                     }
 
                     override fun onNaturalButtonClicked() {
                         Toast.makeText(this@MainActivity,
-                            "You can grant permission later from Settings",
+                            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")
@@ -99,6 +103,7 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
         binding.cut.setOnClickListener { cutNumbers() }
     }
 
+
     private fun handleActivityResult(result: androidx.activity.result.ActivityResult) {
         if (result.resultCode == RESULT_OK) {
             result.data?.data?.let { uri ->
@@ -107,10 +112,8 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
                 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")
         }
     }
 
@@ -149,7 +152,7 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
     }
 
     private fun clearDisplay() {
-        currentExpression = "0"
+        currentExpression = ""
         binding.total.text = ""
         lastWasOperator = false
         lastWasPercent = false
@@ -173,41 +176,24 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
         }
     }
 
-    private fun calculatePercentage() {
-        try {
-            val value = currentExpression.toDouble()
-            currentExpression = (value / 100).toString()
-            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
-
-        // Replace standalone percentages (like "50%") with their decimal form (0.5)
         val matcher = percentagePattern.matcher(processedExpression)
         while (matcher.find()) {
             val fullMatch = matcher.group(0)
             val number = matcher.group(1)
 
-            // Check if it's a standalone percentage or part of an operation
             val start = matcher.start()
             if (start == 0 || !isOperator(processedExpression[start-1].toString())) {
-                val percentageValue = number.toDouble() / 100
+                val percentageValue = number!!.toDouble() / 100
-                processedExpression = processedExpression.replace(fullMatch, percentageValue.toString())
+                processedExpression = processedExpression.replace(fullMatch!!.toString(), percentageValue.toString())
             }
         }
-
-        // Handle operator-percentage combinations (like "100-20%")
         val opMatcher = operatorPercentPattern.matcher(processedExpression)
         val sb = StringBuilder(processedExpression)
-
-        // We need to process matches from right to left to maintain indices
         val matches = mutableListOf<Triple<Int, Int, String>>()
 
         while (opMatcher.find()) {
@@ -219,15 +205,11 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
             matches.add(Triple(start, end, "$operator$percentValue%"))
         }
 
-        // Process matches from right to left
         for (match in matches.reversed()) {
             val (start, end, fullMatch) = match
 
-            // Find the number before this operator
-            var leftNumberEnd = start
             var leftNumberStart = start - 1
 
-            // Skip parentheses and move to the actual number
             if (leftNumberStart >= 0 && sb[leftNumberStart] == ')') {
                 var openParens = 1
                 leftNumberStart--
@@ -238,7 +220,6 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
                     leftNumberStart--
                 }
 
-                // Now we need to find the start of the expression
                 if (leftNumberStart >= 0) {
                     while (leftNumberStart >= 0 && (isDigit(sb[leftNumberStart].toString()) || sb[leftNumberStart] == '.' || sb[leftNumberStart] == '-')) {
                         leftNumberStart--
@@ -248,26 +229,24 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
                     leftNumberStart = 0
                 }
             } else {
-                // For simple numbers, just find the start of the number
+
                 while (leftNumberStart >= 0 && (isDigit(sb[leftNumberStart].toString()) || sb[leftNumberStart] == '.')) {
                     leftNumberStart--
                 }
                 leftNumberStart++
             }
 
-            if (leftNumberStart < leftNumberEnd) {
+            if (leftNumberStart < start) {
-                val leftPart = sb.substring(leftNumberStart, leftNumberEnd)
+                val leftPart = sb.substring(leftNumberStart, start)
 
                 try {
-                    // Extract the numerical values
+
                     val baseNumber = evaluateExpression(leftPart)
                     val operator = fullMatch.substring(0, 1)
                     val percentNumber = fullMatch.substring(1, fullMatch.length - 1).toDouble()
 
-                    // Calculate the percentage of the base number
                     val percentValue = baseNumber * (percentNumber / 100)
 
-                    // Calculate the new value based on the operator
                     val newValue = when (operator) {
                         "+" -> baseNumber + percentValue
                         "-" -> baseNumber - percentValue
@@ -276,7 +255,6 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
                         else -> baseNumber
                     }
 
-                    // Replace the entire expression "number operator percent%" with the result
                     sb.replace(leftNumberStart, end, newValue.toString())
                 } catch (e: Exception) {
                     Log.e("Calculator", "Error processing percentage expression: $e")
@@ -303,10 +281,11 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
         }
     }
 
+    @SuppressLint("DefaultLocale")
     private fun calculateResult() {
         if (currentExpression == "123456") {
             val intent = Intent(this, SetupPasswordActivity::class.java)
-            sp.edit().putBoolean("isFirst", false).apply()
+            sp.edit { putBoolean("isFirst", false) }
             intent.putExtra("password", currentExpression)
             startActivity(intent)
             clearDisplay()
@@ -363,8 +342,6 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
                 binding.total.text = ""
                 return
             }
-
-            // Process the expression for preview calculation
             var processedExpression = currentExpression.replace("×", "*")
 
             if (processedExpression.contains("%")) {
@@ -411,27 +388,24 @@ class MainActivity : AppCompatActivity(), DialogActionsCallback, DialogUtil.Dial
     }
 
     override fun onPositiveButtonClicked() {
-        // Handle positive button click for both DialogUtil and DialogActionsCallback
         fileManager.askPermission(this)
     }
 
     override fun onNegativeButtonClicked() {
-        // Handle negative button click
+        Toast.makeText(this, getString(R.string.storage_permission_is_required_for_the_app_to_function_properly), Toast.LENGTH_LONG).show()
-        Toast.makeText(this, "Storage permission is required for the app to function properly", Toast.LENGTH_LONG).show()
     }
 
     override fun onNaturalButtonClicked() {
-        // Handle neutral button click
+        Toast.makeText(this, getString(R.string.you_can_grant_permission_later_from_settings), Toast.LENGTH_LONG).show()
-        Toast.makeText(this, "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

@@ -6,11 +6,13 @@ import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.lifecycleScope
 import androidx.viewpager2.widget.ViewPager2
+import com.google.android.material.color.DynamicColors
 import devs.org.calculator.R
 import devs.org.calculator.adapters.ImagePreviewAdapter
 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 kotlinx.coroutines.launch
 import java.io.File
 
@@ -18,43 +20,31 @@ 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 prefs:PrefsUtil by lazy { PrefsUtil(this) }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityPreviewBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
-
         fileManager = FileManager(this, this)
 
         currentPosition = intent.getIntExtra("position", 0)
-        type = intent.getStringExtra("type").toString()
+        type = intent.getStringExtra("type") ?: "IMAGE"
-        folder = intent.getStringExtra("folder").toString()
+        folder = intent.getStringExtra("folder") ?: ""
 
         setupFileType()
-        files = fileManager.getFilesInHiddenDirFromFolder(filetype, folder = folder)
+        loadFiles()
-
         setupImagePreview()
-        clickListeners()
+        setupClickListeners()
-
+        setupPageChangeCallback()
-        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
-            override fun onPageSelected(position: Int) {
-                super.onPageSelected(position)
-                
-            }
-        })
-
-        binding.back.setOnClickListener {
-            finish()
-        }
-
     }
 
     override fun onResume() {
@@ -62,6 +52,16 @@ class PreviewActivity : AppCompatActivity() {
         setupFlagSecure()
     }
 
+    override fun onPause() {
+        super.onPause()
+        adapter.releaseAllResources()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        adapter.releaseAllResources()
+    }
+
     private fun setupFlagSecure() {
         val prefs = getSharedPreferences("app_settings", MODE_PRIVATE)
         if (prefs.getBoolean("screenshot_restriction", true)) {
@@ -93,108 +93,162 @@ class PreviewActivity : AppCompatActivity() {
         }
     }
 
+    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() {
+        if (files.isEmpty()) {
+            finish()
+            return
+        }
+
         adapter = ImagePreviewAdapter(this, this)
         adapter.images = files
         binding.viewPager.adapter = adapter
-
+        if (currentPosition < files.size) {
-        binding.viewPager.setCurrentItem(currentPosition, false)
+            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()
         }
+
+        updateFileInfo()
     }
 
-    override fun onDestroy() {
+    private fun setupPageChangeCallback() {
-        super.onDestroy()
+        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
-        if (filetype == FileManager.FileType.AUDIO) {
+            override fun onPageSelected(position: Int) {
-            (binding.viewPager.adapter as? ImagePreviewAdapter)?.let { adapter ->
+                super.onPageSelected(position)
-                adapter.currentMediaPlayer?.release()
+                currentPosition = position
-                adapter.currentMediaPlayer = null
+                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 clickListeners() {
+
+    private fun setupClickListeners() {
+        binding.back.setOnClickListener {
+            finish()
+        }
+
         binding.delete.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUriImage(this, files[binding.viewPager.currentItem])
+            handleDeleteFile()
-            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 {
-                                FileManager(this@PreviewActivity, this@PreviewActivity).deletePhotoFromExternalStorage(fileUri)
-                                removeFileFromList(binding.viewPager.currentItem)
-                            }
-                        }
-
-                        override fun onNegativeButtonClicked() {
-                            // Handle negative button click
-                        }
-
-                        override fun onNaturalButtonClicked() {
-                            // Handle neutral button click
-                        }
-                    }
-                )
-            }
         }
 
         binding.unHide.setOnClickListener {
-            val fileUri = FileManager.FileManager().getContentUriImage(this, files[binding.viewPager.currentItem])
+            handleUnhideFile()
-            if (fileUri != null) {
+        }
-                dialogUtil.showMaterialDialog(
+        binding.viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
-                    getString(R.string.un_hide_file),
+            override fun onPageSelected(position: Int) {
-                    getString(R.string.are_you_sure_you_want_to_un_hide_this_file),
+                super.onPageSelected(position)
-                    getString(R.string.un_hide),
+                adapter.onItemScrolledAway(currentPosition)
-                    getString(R.string.cancel),
+                currentPosition = position
-                    object : DialogUtil.DialogCallback {
+            }
-                        override fun onPositiveButtonClicked() {
+        })
-                            lifecycleScope.launch {
+    }
-                                FileManager(this@PreviewActivity, this@PreviewActivity).copyFileToNormalDir(fileUri)
+
-                                removeFileFromList(binding.viewPager.currentItem)
+    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 {
+                                fileManager.deletePhotoFromExternalStorage(fileUri)
+                                removeFileFromList(currentPosition)
+                            } catch (e: Exception) {
+                                e.printStackTrace()
                             }
                         }
+                    }
 
-                        override fun onNegativeButtonClicked() {
+                    override fun onNegativeButtonClicked() {}
-                            // Handle negative button click
-                        }
 
-                        override fun onNaturalButtonClicked() {
+                    override fun onNaturalButtonClicked() {}
-                            // Handle neutral button click
+                }
+            )
+        }
+    }
+
+    private fun handleUnhideFile() {
+        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.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 {
+                            try {
+                                fileManager.copyFileToNormalDir(fileUri)
+                                removeFileFromList(currentPosition)
+                            } catch (e: Exception) {
+                                e.printStackTrace()
+                            }
                         }
                     }
-                )
+
-            }
+                    override fun onNegativeButtonClicked() {}
+
+                    override fun onNaturalButtonClicked() {}
+                }
+            )
         }
     }
 
     private fun removeFileFromList(position: Int) {
-        val updatedFiles = files.toMutableList().apply { removeAt(position) }
+        if (position < 0 || position >= files.size) return
-        files = updatedFiles
+        adapter.releaseAllResources()
-        adapter.images = updatedFiles // Update adapter with the new list
+        files.removeAt(position)
-
+        adapter.images = files
-        // Update the ViewPager's position
+        if (files.isEmpty()) {
-        if (updatedFiles.isEmpty()) finish()
+            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

@@ -1,36 +1,32 @@
 package devs.org.calculator.activities
 
 import android.content.Intent
-import android.content.SharedPreferences
-import android.net.Uri
 import android.os.Bundle
 import android.view.View
 import android.view.WindowManager
-import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
-import androidx.core.view.ViewCompat
+import androidx.core.net.toUri
-import androidx.core.view.WindowCompat
+import com.google.android.material.color.DynamicColors
-import androidx.core.view.WindowInsetsCompat
-import androidx.core.view.WindowInsetsControllerCompat
 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
 
 class SettingsActivity : AppCompatActivity() {
 
     private lateinit var binding: ActivitySettingsBinding
-    private lateinit var prefs: SharedPreferences
+    private val prefs:PrefsUtil by lazy { PrefsUtil(this) }
-    private val DEV_GITHUB_URL = "https://github.com/binondi"
+    private var DEV_GITHUB_URL = ""
-    private val GITHUB_URL = "$DEV_GITHUB_URL/calculator-hide-files"
+    private var GITHUB_URL = ""
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivitySettingsBinding.inflate(layoutInflater)
         setContentView(binding.root)
-
+        DEV_GITHUB_URL = getString(R.string.github_profile)
-        prefs = getSharedPreferences("app_settings", MODE_PRIVATE)
+        GITHUB_URL = getString(R.string.calculator_hide_files, DEV_GITHUB_URL)
         setupUI()
         loadSettings()
         setupListeners()
@@ -42,6 +38,7 @@ class SettingsActivity : AppCompatActivity() {
         }
     }
 
+
     private fun loadSettings() {
 
         binding.dynamicThemeSwitch.isChecked = prefs.getBoolean("dynamic_theme", true)
@@ -72,9 +69,14 @@ class SettingsActivity : AppCompatActivity() {
         }
 
         binding.dynamicThemeSwitch.setOnCheckedChangeListener { _, isChecked ->
-            prefs.edit().putBoolean("dynamic_theme", isChecked).apply()
+            prefs.setBoolean("dynamic_theme", isChecked)
             if (!isChecked) {
                 showThemeModeDialog()
+            }else{
+                showThemeModeDialog()
+                if (!prefs.getBoolean("isAppReopened",false)){
+                    DynamicColors.applyToActivityIfAvailable(this)
+                }
             }
         }
 
@@ -97,7 +99,7 @@ class SettingsActivity : AppCompatActivity() {
         }
 
         binding.screenshotRestrictionSwitch.setOnCheckedChangeListener { _, isChecked ->
-            prefs.edit().putBoolean("screenshot_restriction", isChecked).apply()
+            prefs.setBoolean("screenshot_restriction", isChecked)
             if (isChecked) {
                 enableScreenshotRestriction()
             } else {
@@ -105,7 +107,7 @@ class SettingsActivity : AppCompatActivity() {
             }
         }
         binding.showFileNames.setOnCheckedChangeListener { _, isChecked ->
-            prefs.edit().putBoolean("showFileName", isChecked).apply()
+            prefs.setBoolean("showFileName", isChecked)
         }
     }
 
@@ -115,20 +117,16 @@ class SettingsActivity : AppCompatActivity() {
 
     private fun showThemeModeDialog() {
         MaterialAlertDialogBuilder(this)
-            .setTitle("Theme Mode")
+            .setTitle(getString(R.string.attention))
-            .setMessage("Would you like to set a specific theme mode?")
+            .setMessage(getString(R.string.if_you_turn_on_off_this_option_dynamic_theme_changes_will_be_visible_after_you_reopen_the_app))
-            .setPositiveButton("Yes") { _, _ ->
+            .setPositiveButton(getString(R.string.ok)) { _, _ ->
-                binding.themeModeSwitch.isChecked = true
+
-            }
-            .setNegativeButton("No") { _, _ ->
-                binding.systemThemeRadio.isChecked = true
-                applyThemeMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
             }
             .show()
     }
 
     private fun applyThemeMode(themeMode: Int) {
-        prefs.edit().putInt("theme_mode", themeMode).apply()
+        prefs.setInt("theme_mode", themeMode)
         AppCompatDelegate.setDefaultNightMode(themeMode)
     }
 
@@ -145,10 +143,11 @@ class SettingsActivity : AppCompatActivity() {
 
     private fun openUrl(url: String) {
         try {
-            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+            val intent = Intent(Intent.ACTION_VIEW, url.toUri())
             startActivity(intent)
         } catch (e: Exception) {
-            Snackbar.make(binding.root, "Could not open URL", Snackbar.LENGTH_SHORT).show()
+            Snackbar.make(binding.root,
+                getString(R.string.could_not_open_url), Snackbar.LENGTH_SHORT).show()
         }
     }
 }

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

@@ -6,6 +6,7 @@ import android.view.LayoutInflater
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+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
@@ -18,6 +19,7 @@ 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)
@@ -72,8 +74,6 @@ class SetupPasswordActivity : AppCompatActivity() {
         }
 
         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,
                 getString(R.string.security_question_not_set_yet), Toast.LENGTH_SHORT).show()

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

@@ -2,7 +2,6 @@ package devs.org.calculator.activities
 
 import android.annotation.SuppressLint
 import android.content.Intent
-import android.content.SharedPreferences
 import android.net.Uri
 import android.os.Bundle
 import android.os.Environment
@@ -20,8 +19,9 @@ import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.bottomsheet.BottomSheetDialog
+import com.google.android.material.color.DynamicColors
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import devs.org.calculator.R
 import devs.org.calculator.adapters.FileAdapter
 import devs.org.calculator.adapters.FolderSelectionAdapter
@@ -32,6 +32,7 @@ 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 kotlinx.coroutines.launch
 import java.io.File
 
@@ -51,12 +52,12 @@ class ViewFolderActivity : AppCompatActivity() {
     private var currentFolder: File? = null
     private val hiddenDir = File(Environment.getExternalStorageDirectory(), HIDDEN_DIR)
     private lateinit var pickImageLauncher: ActivityResultLauncher<Intent>
-    private lateinit var prefs: SharedPreferences
 
     private var customDialog: androidx.appcompat.app.AlertDialog? = null
 
     private var dialogShowTime: Long = 0
     private val MINIMUM_DIALOG_DURATION = 1200L
+    private val prefs:PrefsUtil by lazy { PrefsUtil(this) }
 
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -81,11 +82,11 @@ class ViewFolderActivity : AppCompatActivity() {
 
     private fun initialize() {
         fileManager = FileManager(this, this)
-        folderManager = FolderManager(this)
+        folderManager = FolderManager()
         dialogUtil = DialogUtil(this)
-        prefs = getSharedPreferences("app_settings", MODE_PRIVATE)
     }
 
+
     private fun setupActivityResultLaunchers() {
         pickImageLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
             if (result.resultCode == RESULT_OK) {
@@ -192,19 +193,12 @@ class ViewFolderActivity : AppCompatActivity() {
         }
     }
 
-    private fun refreshCurrentView() {
-        if (currentFolder != null) {
-            refreshCurrentFolder()
-        }
-    }
-
     override fun onResume() {
         super.onResume()
         refreshCurrentFolder()
     }
 
     private fun openFolder(folder: File) {
-        // Ensure folder exists and has .nomedia file
         if (!folder.exists()) {
             folder.mkdirs()
             File(folder, ".nomedia").createNewFile()
@@ -227,8 +221,6 @@ class ViewFolderActivity : AppCompatActivity() {
 
     private fun showFileList(files: List<File>, folder: File) {
         binding.recyclerView.layoutManager = GridLayoutManager(this, 3)
-
-        // Clean up previous adapter
         fileAdapter?.cleanup()
 
         fileAdapter = FileAdapter(this, this, folder, prefs.getBoolean("showFileName", true),
@@ -344,13 +336,9 @@ class ViewFolderActivity : AppCompatActivity() {
                     performFileUnhiding(selectedFiles)
                 }
 
-                override fun onNegativeButtonClicked() {
+                override fun onNegativeButtonClicked() {}
-                    // Do nothing
-                }
 
-                override fun onNaturalButtonClicked() {
+                override fun onNaturalButtonClicked() {}
-                    // Do nothing
-                }
             }
         )
     }
@@ -368,13 +356,9 @@ class ViewFolderActivity : AppCompatActivity() {
                     performFileDeletion(selectedFiles)
                 }
 
-                override fun onNegativeButtonClicked() {
+                override fun onNegativeButtonClicked() {}
-                    // Do nothing
-                }
 
-                override fun onNaturalButtonClicked() {
+                override fun onNaturalButtonClicked() {}
-                    // Do nothing
-                }
             }
         )
     }
@@ -523,8 +507,6 @@ class ViewFolderActivity : AppCompatActivity() {
                 }
 
                 Toast.makeText(this@ViewFolderActivity, message, Toast.LENGTH_SHORT).show()
-
-                // Fixed: Ensure proper order of operations
                 fileAdapter?.exitSelectionMode()
                 refreshCurrentFolder()
             }
@@ -546,8 +528,6 @@ class ViewFolderActivity : AppCompatActivity() {
         }
 
         Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
-
-        // Fixed: Ensure proper order of operations
         fileAdapter?.exitSelectionMode()
         refreshCurrentFolder()
     }
@@ -569,10 +549,8 @@ class ViewFolderActivity : AppCompatActivity() {
             }
         }
 
-        val message = if (allCopied) "Files copied successfully" else "Some files could not be copied"
+        val message = if (allCopied) getString(R.string.files_copied_successfully) else getString(R.string.some_files_could_not_be_copied)
         Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
-
-        // Fixed: Ensure proper order of operations
         fileAdapter?.exitSelectionMode()
         refreshCurrentFolder()
     }
@@ -589,17 +567,15 @@ class ViewFolderActivity : AppCompatActivity() {
             }
         }
 
-        val message = if (allMoved) "Files moved successfully" else "Some files could not be moved"
+        val message = if (allMoved) getString(R.string.files_moved_successfully) else getString(R.string.some_files_could_not_be_moved)
         Toast.makeText(this, message, Toast.LENGTH_SHORT).show()
-
-        // Fixed: Ensure proper order of operations
         fileAdapter?.exitSelectionMode()
         refreshCurrentFolder()
     }
 
     private fun showFolderSelectionDialog(onFolderSelected: (File) -> Unit) {
         val folders = folderManager.getFoldersInDirectory(hiddenDir)
-            .filter { it != currentFolder } // Exclude current folder
+            .filter { it != currentFolder }
 
         if (folders.isEmpty()) {
             Toast.makeText(this, getString(R.string.no_folders_available), Toast.LENGTH_SHORT).show()

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

@@ -38,10 +38,8 @@ class FileAdapter(
     private val selectedItems = mutableSetOf<Int>()
     private var isSelectionMode = false
 
-    // Use WeakReference to prevent memory leaks
     private var fileOperationCallback: WeakReference<FileOperationCallback>? = null
 
-    // Background executor for file operations
     private val fileExecutor = Executors.newSingleThreadExecutor()
     private val mainHandler = Handler(Looper.getMainLooper())
 
@@ -49,7 +47,6 @@ class FileAdapter(
         private const val TAG = "FileAdapter"
     }
 
-    // Callback interface for handling file operations and selection changes
     interface FileOperationCallback {
         fun onFileDeleted(file: File)
         fun onFileRenamed(oldFile: File, newFile: File)
@@ -75,7 +72,6 @@ class FileAdapter(
             setupClickListeners(file, fileType)
             fileNameTextView.visibility = if (showFileName) View.VISIBLE else View.GONE
 
-            // Update selection state
             val position = adapterPosition
             if (position != RecyclerView.NO_POSITION) {
                 val isSelected = selectedItems.contains(position)
@@ -89,7 +85,6 @@ class FileAdapter(
                 return
             }
 
-            // Handle partial updates based on payload
             val changes = payloads.firstOrNull() as? List<String>
             changes?.forEach { change ->
                 when (change) {
@@ -97,14 +92,13 @@ class FileAdapter(
                         fileNameTextView.text = file.name
                     }
                     "SIZE_CHANGED", "MODIFIED_DATE_CHANGED" -> {
-                        // Could update file info if displayed
+
                     }
                     "SELECTION_CHANGED" -> {
                         val position = adapterPosition
                         if (position != RecyclerView.NO_POSITION) {
                             val isSelected = selectedItems.contains(position)
                             updateSelectionUI(isSelected)
-                            // Notify activity about selection change
                             notifySelectionModeChange()
                         }
                     }
@@ -128,7 +122,6 @@ class FileAdapter(
                         .centerCrop()
                         .diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                         .error(R.drawable.ic_document)
-                        .placeholder(R.drawable.ic_document)
                         .into(imageView)
                 }
                 FileManager.FileType.VIDEO -> {
@@ -138,12 +131,12 @@ class FileAdapter(
                         .centerCrop()
                         .diskCacheStrategy(DiskCacheStrategy.AUTOMATIC)
                         .error(R.drawable.ic_document)
-                        .placeholder(R.drawable.ic_document)
                         .into(imageView)
                 }
                 FileManager.FileType.AUDIO -> {
                     playIcon.visibility = View.GONE
                     imageView.setImageResource(R.drawable.ic_audio)
+                    imageView.setPadding(50,50,50,50)
                 }
                 else -> {
                     playIcon.visibility = View.GONE
@@ -191,16 +184,18 @@ class FileAdapter(
         }
 
         private fun openAudioFile(file: File) {
+            val fileType = FileManager(context,lifecycleOwner).getFileType(file)
             try {
-                val uri = FileProvider.getUriForFile(
+                val fileTypeString = when (fileType) {
-                    context,
+                    FileManager.FileType.IMAGE -> context.getString(R.string.image)
-                    "${context.packageName}.fileprovider",
+                    FileManager.FileType.VIDEO -> context.getString(R.string.video)
-                    file
+                    else -> "unknown"
-                )
+                }
-                val intent = Intent(Intent.ACTION_VIEW).apply {
+
-                    setDataAndType(uri, "audio/*")
+                val intent = Intent(context, PreviewActivity::class.java).apply {
+                    putExtra("type", fileTypeString)
                     putExtra("folder", currentFolder.toString())
-                    addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                    putExtra("position", adapterPosition)
                 }
                 context.startActivity(intent)
             } catch (e: Exception) {
@@ -316,7 +311,6 @@ class FileAdapter(
         }
 
         private fun deleteFile(file: File) {
-            // Show confirmation dialog first
             MaterialAlertDialogBuilder(context)
                 .setTitle("Delete File")
                 .setMessage("Are you sure you want to delete ${file.name}?")
@@ -436,12 +430,10 @@ class FileAdapter(
         }
 
         private fun copyToAnotherFolder(file: File) {
-            // This will be handled by the activity
             fileOperationCallback?.get()?.onRefreshNeeded()
         }
 
         private fun moveToAnotherFolder(file: File) {
-            // This will be handled by the activity
             fileOperationCallback?.get()?.onRefreshNeeded()
         }
 
@@ -489,7 +481,6 @@ class FileAdapter(
             currentList.clear()
             super.submitList(null)
         } else {
-            // Create a new list to force update
             val newList = list.toMutableList()
             super.submitList(newList)
         }
@@ -502,6 +493,7 @@ class FileAdapter(
         }
     }
 
+    @SuppressLint("NotifyDataSetChanged")
     fun exitSelectionMode() {
         if (isSelectionMode) {
             isSelectionMode = false
@@ -574,8 +566,6 @@ class FileAdapter(
     fun deleteSelectedFiles() {
         val selectedFiles = getSelectedItems()
         if (selectedFiles.isEmpty()) return
-
-        // Show confirmation dialog
         MaterialAlertDialogBuilder(context)
             .setTitle("Delete Files")
             .setMessage("Are you sure you want to delete ${selectedFiles.size} file(s)?")
@@ -611,10 +601,8 @@ class FileAdapter(
             }
 
             mainHandler.post {
-                // Exit selection mode first
                 exitSelectionMode()
 
-                // Show detailed result message
                 when {
                     deletedCount > 0 && failedCount == 0 -> {
                         Toast.makeText(context, "Deleted $deletedCount file(s)", Toast.LENGTH_SHORT).show()
@@ -641,7 +629,6 @@ class FileAdapter(
 
         try {
             if (selectedFiles.size == 1) {
-                // Share single file
                 val file = selectedFiles.first()
                 val uri = FileProvider.getUriForFile(
                     context,
@@ -657,7 +644,6 @@ class FileAdapter(
                     Intent.createChooser(shareIntent, context.getString(R.string.share_file))
                 )
             } else {
-                // Share multiple files
                 val uris = selectedFiles.mapNotNull { file ->
                     try {
                         FileProvider.getUriForFile(
@@ -709,7 +695,6 @@ class FileAdapter(
                     notifyItemChanged(position, listOf("SELECTION_CHANGED"))
                 }
             }
-            // Ensure callback is notified
             notifySelectionModeChange()
         }
     }

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

@@ -6,13 +6,10 @@ import java.io.File
 class FileDiffCallback : DiffUtil.ItemCallback<File>() {
 
     override fun areItemsTheSame(oldItem: File, newItem: File): Boolean {
-        // Compare by absolute path since File objects might be different instances
-        // but represent the same file
         return oldItem.absolutePath == newItem.absolutePath
     }
 
     override fun areContentsTheSame(oldItem: File, newItem: File): Boolean {
-        // Compare all relevant properties that might change and affect the UI
         return oldItem.name == newItem.name &&
                 oldItem.length() == newItem.length() &&
                 oldItem.lastModified() == newItem.lastModified() &&
@@ -22,8 +19,6 @@ class FileDiffCallback : DiffUtil.ItemCallback<File>() {
     }
 
     override fun getChangePayload(oldItem: File, newItem: File): Any? {
-        // Return a payload if only specific properties changed
-        // This allows for partial updates instead of full rebinding
         val changes = mutableListOf<String>()
 
         if (oldItem.name != newItem.name) {
@@ -42,6 +37,6 @@ class FileDiffCallback : DiffUtil.ItemCallback<File>() {
             changes.add("EXISTENCE_CHANGED")
         }
 
-        return if (changes.isNotEmpty()) changes else null
+        return changes.ifEmpty { null }
     }
 }

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

@@ -1,5 +1,6 @@
 package devs.org.calculator.adapters
 
+import android.annotation.SuppressLint
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -80,6 +81,7 @@ class FolderAdapter(
         }
     }
 
+    @SuppressLint("NotifyDataSetChanged")
     fun clearSelection() {
         val wasInSelectionMode = isSelectionMode
         selectedItems.clear()

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

@@ -9,7 +9,6 @@ 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.recyclerview.widget.AsyncListDiffer
 import androidx.recyclerview.widget.RecyclerView
@@ -25,11 +24,8 @@ class ImagePreviewAdapter(
 ) : 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
 
     var images: List<File>
         get() = differ.currentList
@@ -43,32 +39,35 @@ class ImagePreviewAdapter(
     override fun onBindViewHolder(holder: ImageViewHolder, position: Int) {
         val imageUrl = images[position]
         val fileType = FileManager(context, lifecycleOwner).getFileType(images[position])
-        holder.bind(imageUrl,fileType)
-        currentViewHolder = holder
 
-        currentMediaPlayer?.let {
+        stopAndResetCurrentAudio()
-            if (it.isPlaying) it.pause()
-            it.seekTo(0)
-        }
-        currentMediaPlayer = null
-        isMediaPlayerPrepared = false
 
-        if (currentMediaPlayer?.isPlaying == true) {
+        holder.bind(imageUrl, fileType, position)
-            currentMediaPlayer?.stop()
-            currentMediaPlayer?.release()
-        }
-        currentMediaPlayer = null
     }
 
     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
+
+        fun bind(file: File, fileType: FileManager.FileType, position: Int) {
+            currentPosition = position
+
+            releaseMediaPlayer()
+            resetAudioUI()
 
-        fun bind(file: File, fileType: FileManager.FileType) {
             when (fileType) {
                 FileManager.FileType.VIDEO -> {
                     binding.imageView.visibility = View.GONE
@@ -114,7 +113,6 @@ class ImagePreviewAdapter(
                     binding.audioTitle.text = file.name
 
                     setupAudioPlayer(file)
-                    setupSeekBar()
                     setupPlaybackControls()
                 }
                 else -> {
@@ -125,27 +123,40 @@ class ImagePreviewAdapter(
             }
         }
 
+        private fun resetAudioUI() {
+            binding.playPause.setImageResource(R.drawable.play)
+            binding.audioSeekBar.value = 0f
+            binding.audioSeekBar.valueTo = 100f // Default value
+            seekRunnable?.let { seekHandler.removeCallbacks(it) }
+        }
+
         private fun setupAudioPlayer(file: File) {
-            mediaPlayer = MediaPlayer().apply {
+            try {
-                setDataSource(file.absolutePath)
+                mediaPlayer = MediaPlayer().apply {
-                setOnPreparedListener { mp ->
+                    setDataSource(file.absolutePath)
-                    binding.audioSeekBar.valueTo = mp.duration.toFloat()
+                    setOnPreparedListener { mp ->
-
+                        binding.audioSeekBar.valueTo = mp.duration.toFloat()
-                    isMediaPlayerPrepared = true
+                        binding.audioSeekBar.value = 0f
+                        setupSeekBar()
+                        isMediaPlayerPrepared = true
+                    }
+                    setOnCompletionListener {
+                        stopAndResetAudio()
+                    }
+                    setOnErrorListener { _, _, _ ->
+                        releaseMediaPlayer()
+                        true
+                    }
+                    prepareAsync()
                 }
-                setOnCompletionListener {
+            } catch (e: Exception) {
-//                    isPlaying = false
+                e.printStackTrace()
-                    binding.playPause.setImageResource(R.drawable.play)
+                releaseMediaPlayer()
-                    binding.audioSeekBar.value = 0f
-
-                    seekHandler.removeCallbacks(seekRunnable!!)
-                }
-                prepareAsync()
             }
         }
 
         private fun setupSeekBar() {
-            binding.audioSeekBar.addOnChangeListener { slider, value, fromUser ->
+            binding.audioSeekBar.addOnChangeListener { _, value, fromUser ->
                 if (fromUser && mediaPlayer != null && isMediaPlayerPrepared) {
                     mediaPlayer?.seekTo(value.toInt())
                 }
@@ -153,15 +164,18 @@ class ImagePreviewAdapter(
 
             seekRunnable = Runnable {
                 mediaPlayer?.let { mp ->
-                    if (mp.isPlaying) {
+                    if (mp.isPlaying && isMediaPlayerPrepared) {
-                        binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                        try {
-                        seekHandler.postDelayed(seekRunnable!!, 100)
+                            binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                            seekHandler.postDelayed(seekRunnable!!, 100)
+                        } catch (e: Exception) {
+                            e.printStackTrace()
+                        }
                     }
                 }
             }
         }
 
-
         private fun setupPlaybackControls() {
             binding.playPause.setOnClickListener {
                 if (isPlaying) {
@@ -173,65 +187,127 @@ class ImagePreviewAdapter(
 
             binding.preview.setOnClickListener {
                 mediaPlayer?.let { mp ->
-                    val newPosition = mp.currentPosition - 10000
+                    if (isMediaPlayerPrepared) {
-                    mp.seekTo(maxOf(0, newPosition))
+                        try {
-                    binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                            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
+                    if (isMediaPlayerPrepared) {
-                    mp.seekTo(minOf(mp.duration, newPosition))
+                        try {
-                    binding.audioSeekBar.value = mp.currentPosition.toFloat()
+                            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) {
+                if (isMediaPlayerPrepared) {
-                    currentViewHolder?.pauseAudio()
+                    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) {
+                try {
-                    mp.pause()
+                    if (mp.isPlaying) {
-                    isPlaying = false
+                        mp.pause()
-                    binding.playPause.setImageResource(R.drawable.play)
+                        isPlaying = false
-                    seekHandler.removeCallbacks(seekRunnable!!)
+                        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 ->
+            try {
-                if (mp.isPlaying) {
+                mediaPlayer?.let { mp ->
-                    mp.stop()
+                    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 (position < images.size) {
-            val fileType = FileManager(context, lifecycleOwner).getFileType(images[position])
+                val nextFile = images[position]
-            if (fileType == FileManager.FileType.VIDEO) {
+                val fileType = FileManager(context, lifecycleOwner).getFileType(images[position])
-                val videoUri = Uri.fromFile(nextFile)
+                if (fileType == FileManager.FileType.VIDEO) {
-                binding.videoView.setVideoURI(videoUri)
+                    val videoUri = Uri.fromFile(nextFile)
-                binding.videoView.start()
+                    binding.videoView.setVideoURI(videoUri)
+                    binding.videoView.start()
+                }
             }
         }
     }
@@ -240,5 +316,14 @@ 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

@@ -1,9 +1,9 @@
 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
@@ -22,9 +22,9 @@ class ListFolderAdapter(
     private var isSelectionMode = false
 
     inner class FolderViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
-        val folderNameTextView: TextView = itemView.findViewById(R.id.folderName)
+        private val folderNameTextView: TextView = itemView.findViewById(R.id.folderName)
 
-        val selectedLayer: View = itemView.findViewById(R.id.selectedLayer)
+        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
@@ -89,6 +89,7 @@ class ListFolderAdapter(
         }
     }
 
+    @SuppressLint("NotifyDataSetChanged")
     fun clearSelection() {
         val wasInSelectionMode = isSelectionMode
         selectedItems.clear()

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

@@ -1,19 +1,14 @@
 package devs.org.calculator.utils
 
-import android.content.Context
-import android.os.Environment
 import java.io.File
 
-class FolderManager(private val context: Context) {
+class FolderManager {
-    companion object {
+
-        const val HIDDEN_DIR = ".CalculatorHide"
-    }
 
     fun createFolder(parentDir: File, folderName: String): Boolean {
         val newFolder = File(parentDir, folderName)
         return if (!newFolder.exists()) {
             newFolder.mkdirs()
-            // Create .nomedia file to hide from media scanners
             File(newFolder, ".nomedia").createNewFile()
             true
         } else {
@@ -54,20 +49,4 @@ class FolderManager(private val context: Context) {
             emptyList()
         }
     }
-
-    fun moveFileToFolder(file: File, targetFolder: File): Boolean {
-        return try {
-            if (!targetFolder.exists()) {
-                targetFolder.mkdirs()
-                File(targetFolder, ".nomedia").createNewFile()
-            }
-            val newFile = File(targetFolder, file.name)
-            file.copyTo(newFile, overwrite = true)
-            file.delete()
-            true
-        } catch (e: Exception) {
-            e.printStackTrace()
-            false
-        }
-    }
 } 

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)
@@ -13,26 +14,33 @@ class PrefsUtil(context: Context) {
 
     fun savePassword(password: String) {
         val hashedPassword = hashPassword(password)
-        prefs.edit()
+        prefs.edit {
-            .putString("password", hashedPassword)
+            putString("password", hashedPassword)
-            .apply()
+        }
     }
 
     fun setBoolean(key:String, value: Boolean){
-        return prefs.edit().putBoolean(key,value).apply()
+        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()
+        prefs.edit {
-            .remove("password")
+            remove("password")
-            .remove("security_question")
+                .remove("security_question")
-            .remove("security_answer")
+                .remove("security_answer")
-            .apply()
+        }
     }
 
     fun validatePassword(input: String): Boolean {
@@ -41,10 +49,10 @@ class PrefsUtil(context: Context) {
     }
 
     fun saveSecurityQA(question: String, answer: String) {
-        prefs.edit()
+        prefs.edit {
-            .putString("security_question", question)
+            putString("security_question", question)
-            .putString("security_answer", hashPassword(answer))
+                .putString("security_answer", hashPassword(answer))
-            .apply()
+        }
     }
 
     fun validateSecurityAnswer(answer: String): Boolean {

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

@@ -12,6 +12,7 @@ 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) {
     
@@ -34,7 +35,7 @@ class StoragePermissionUtil(private val activity: AppCompatActivity) {
                     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)
                 }

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

@@ -1,6 +1,6 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="800dp"
+    android:width="50dp"
-    android:height="800dp"
+    android:height="50dp"
     android:viewportWidth="24"
     android:viewportHeight="24">
   <path

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

@@ -2,5 +2,5 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android">
 
     <corners android:bottomLeftRadius="15dp" android:bottomRightRadius="15dp"/>
-    <solid android:color="?attr/cardForegroundColor"/>
+    <solid android:color="?attr/colorSecondaryContainer"/>
 </shape>

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:width="50dp"
-    android:height="24dp"
+    android:height="50dp"
     android:viewportWidth="24"
     android:viewportHeight="24">
-    <path
+  <path
-        android:fillColor="@color/textColor"
+      android:fillColor="#FF000000"
-        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"/>
+      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/layout/activity_hidden.xml

@@ -39,57 +39,38 @@
             android:layout_weight="1"
             android:id="@+id/folderName"/>
 
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:src="@drawable/ic_edit"
+            app:icon="@drawable/ic_edit"
-            app:tint="?attr/colorPrimary"
+            style="@style/Widget.Material3.Button.IconButton"
-            android:scaleType="fitCenter"
-            android:padding="9dp"
-            android:visibility="gone"
-            android:background="#00000000"
             android:id="@+id/edit"/>
 
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
             android:id="@+id/delete"
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:background="#00000000"
+            app:icon="@drawable/ic_delete"
-            android:padding="9dp"
+            style="@style/Widget.Material3.Button.IconButton" />
-            android:scaleType="fitCenter"
-            android:src="@drawable/ic_delete"
-            app:tint="?attr/colorPrimary"
-            android:visibility="gone" />
 
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
             android:id="@+id/menuButton"
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:src="@drawable/ic_more"
+            app:icon="@drawable/ic_more"
-            app:tint="?attr/colorPrimary"
+            style="@style/Widget.Material3.Button.IconButton"/>
-            android:scaleType="fitCenter"
-            android:padding="9dp"
-            android:visibility="gone"
-            android:background="#00000000"/>
 
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:src="@drawable/ic_list"
+            app:icon="@drawable/ic_list"
-            android:scaleType="fitCenter"
+            style="@style/Widget.Material3.Button.IconButton"
-            app:tint="?attr/colorPrimary"
-            android:background="#00000000"
-            android:padding="8dp"
             android:id="@+id/folderOrientation"/>
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:src="@drawable/ic_settings"
+            app:icon="@drawable/ic_settings"
-            android:scaleType="fitCenter"
+            style="@style/Widget.Material3.Button.IconButton"
-            app:tint="?attr/colorPrimary"
-
-            android:background="#00000000"
-            android:padding="8dp"
             android:id="@+id/settings"/>
     </LinearLayout>
 
@@ -128,7 +109,7 @@
             android:layout_marginTop="8dp"
             android:gravity="center"
             android:padding="10dp"
-            android:text="@string/no_items_available_add_one_by_clicking_on_the_plus_button"
+            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>

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

@@ -14,7 +14,7 @@
         android:layout_margin="0dp"
         android:background="@drawable/bottom_corner"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintHeight_percent="0.3"
+        app:layout_constraintHeight_percent="0.4"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent">
 
@@ -23,6 +23,7 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:scrollbars="none"
+            android:paddingTop="27dp"
             android:gravity="end|bottom"
             app:layout_constraintBottom_toTopOf="@+id/total"
             app:layout_constraintEnd_toEndOf="parent"
@@ -59,7 +60,7 @@
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:autoSizeMaxTextSize="40sp"
-            android:autoSizeMinTextSize="24sp"
+            android:autoSizeMinTextSize="12sp"
             android:autoSizeStepGranularity="2sp"
             android:autoSizeTextType="uniform"
             android:gravity="end|bottom"
@@ -85,7 +86,7 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/displayContainer">
 
-        <LinearLayout
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
@@ -95,49 +96,68 @@
                 android:id="@+id/btnClear"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_marginHorizontal="3dp"
-                android:layout_weight="1"
+                android:backgroundTint="?attr/colorSecondaryContainer"
                 android:text="C"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnPercent"
+                app:layout_constraintHorizontal_chainStyle="spread"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent" />
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnPercent"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:backgroundTint="?attr/colorSecondaryContainer"
-                android:layout_weight="1"
                 android:text="%"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                android:layout_marginHorizontal="3dp"
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnDivide"
+                app:layout_constraintStart_toEndOf="@+id/btnClear"
+                app:layout_constraintTop_toTopOf="parent" />
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnDivide"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:backgroundTint="?attr/colorSecondaryContainer"
-                android:layout_weight="1"
                 android:text="÷"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                android:layout_marginHorizontal="3dp"
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/cut"
+                app:layout_constraintStart_toEndOf="@+id/btnPercent"
+                app:layout_constraintTop_toTopOf="parent" />
 
             <ImageButton
                 android:id="@+id/cut"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_marginHorizontal="4dp"
-                android:layout_weight="1"
-                android:layout_marginVertical="8dp"
                 android:background="@drawable/gradient_bg"
+                android:scaleType="centerInside"
                 android:src="@drawable/backspace"
-                android:scaleType="centerInside"/>
+                android:layout_marginHorizontal="3dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/btnDivide"
+                app:layout_constraintTop_toTopOf="parent" />
 
-        </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
 
-        <LinearLayout
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
@@ -147,10 +167,16 @@
                 android:id="@+id/btn7"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="7"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn8"
+                app:layout_constraintHorizontal_chainStyle="spread"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent"
                 android:textSize="30sp"
                 app:cornerRadius="15dp" />
 
@@ -158,21 +184,32 @@
                 android:id="@+id/btn8"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="8"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn9"
+                app:layout_constraintStart_toEndOf="@+id/btn7"
+                app:layout_constraintTop_toTopOf="parent"
+                 />
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn9"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="9"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnMultiply"
+                app:layout_constraintStart_toEndOf="@+id/btn8"
+                app:layout_constraintTop_toTopOf="parent"
                 android:textSize="30sp"
                 app:cornerRadius="15dp" />
 
@@ -180,18 +217,22 @@
                 android:id="@+id/btnMultiply"
                 style="@style/CustomMaterialButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_marginHorizontal="4dp"
-                android:layout_marginVertical="8dp"
                 android:layout_weight="1"
-                android:textColor="@color/white"
+                android:layout_marginHorizontal="3dp"
                 android:text="×"
+                android:textColor="@color/white"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/btn9"
+                app:layout_constraintTop_toTopOf="parent"
                 android:textSize="30sp"
                 app:cornerRadius="15dp" />
 
-        </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
 
-        <LinearLayout
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
@@ -201,51 +242,71 @@
                 android:id="@+id/btn4"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_marginHorizontal="3dp"
                 android:layout_weight="1"
                 android:text="4"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn5"
+                app:layout_constraintHorizontal_chainStyle="spread"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn5"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_marginHorizontal="3dp"
                 android:layout_weight="1"
                 android:text="5"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn6"
+                app:layout_constraintStart_toEndOf="@+id/btn4"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn6"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_marginHorizontal="3dp"
                 android:layout_weight="1"
                 android:text="6"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnMinus"
+                app:layout_constraintStart_toEndOf="@+id/btn5"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnMinus"
                 style="@style/CustomMaterialButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_marginHorizontal="4dp"
+                android:layout_marginHorizontal="3dp"
-                android:layout_marginVertical="8dp"
                 android:layout_weight="1"
                 android:textColor="@color/white"
                 android:text="-"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/btn6"
+                app:layout_constraintTop_toTopOf="parent"/>
 
-        </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
 
-        <LinearLayout
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
@@ -255,92 +316,144 @@
                 android:id="@+id/btn1"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="1"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn2"
+                app:layout_constraintHorizontal_chainStyle="spread"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn2"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="2"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn3"
+                app:layout_constraintStart_toEndOf="@+id/btn1"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn3"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
                 android:layout_weight="1"
+                android:layout_marginHorizontal="3dp"
                 android:text="3"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnPlus"
+                app:layout_constraintStart_toEndOf="@+id/btn2"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnPlus"
                 style="@style/CustomMaterialButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_marginHorizontal="4dp"
-                android:layout_marginVertical="8dp"
                 android:layout_weight="1"
                 android:textColor="@color/white"
+                android:layout_marginHorizontal="3dp"
                 android:text="+"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/btn3"
+                app:layout_constraintTop_toTopOf="parent"
+                />
 
-        </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
 
-        <LinearLayout
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
             android:orientation="horizontal">
 
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/btn00"
+                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
+                android:layout_width="0dp"
+                android:layout_height="0dp"
+                android:layout_marginHorizontal="3dp"
+                android:text="00"
+                android:layout_weight="1"
+                android:textSize="30sp"
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btn0"
+                app:layout_constraintHorizontal_chainStyle="spread"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="parent" />
+
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btn0"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_weight="1"
-                android:layout_weight="2"
+                android:layout_marginHorizontal="3dp"
                 android:text="0"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnDot"
+                app:layout_constraintStart_toEndOf="@+id/btn00"
+                app:layout_constraintTop_toTopOf="parent"/>
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnDot"
                 style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_margin="4dp"
+                android:layout_marginHorizontal="3dp"
-                android:layout_weight="1"
                 android:text="."
+                android:layout_weight="1"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1.15"
+                app:layout_constraintEnd_toStartOf="@+id/btnEquals"
+                app:layout_constraintStart_toEndOf="@+id/btn0"
+                app:layout_constraintTop_toTopOf="parent" />
 
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/btnEquals"
                 style="@style/CustomMaterialButton"
                 android:layout_width="0dp"
-                android:layout_height="match_parent"
+                android:layout_height="0dp"
-                android:layout_marginHorizontal="4dp"
-                android:layout_marginVertical="8dp"
                 android:layout_weight="1"
-                android:textColor="@color/white"
+                android:layout_marginHorizontal="3dp"
                 android:text="="
+                android:textColor="@color/white"
                 android:textSize="30sp"
-                app:cornerRadius="15dp" />
+                app:cornerRadius="15dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintDimensionRatio="1:1"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/btnDot"
+                app:layout_constraintTop_toTopOf="parent"/>
 
-        </LinearLayout>
+        </androidx.constraintlayout.widget.ConstraintLayout>
 
     </LinearLayout>
 

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

@@ -81,7 +81,9 @@
                             android:layout_width="wrap_content"
                             android:layout_height="wrap_content"
                             app:cardCornerRadius="10dp"
-                            app:cardElevation="5dp">
+                            android:background="#00000000"
+                            android:backgroundTint="#00000000"
+                            app:cardElevation="0dp">
                             <ImageView
                                 android:id="@+id/appLogo"
                                 android:layout_width="48dp"

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

@@ -40,16 +40,12 @@
             android:id="@+id/folderName"/>
 
 
-        <androidx.appcompat.widget.AppCompatImageButton
+        <com.google.android.material.button.MaterialButton
             android:id="@+id/menuButton"
-            android:layout_width="40dp"
+            android:layout_width="wrap_content"
-            android:layout_height="40dp"
+            android:layout_height="wrap_content"
-            android:src="@drawable/ic_more"
+            app:icon="@drawable/ic_more"
-            app:tint="?attr/colorPrimary"
+            style="@style/Widget.Material3.Button.IconButton"/>
-            android:scaleType="fitCenter"
-            android:padding="7dp"
-            android:visibility="gone"
-            android:background="#00000000"/>
 
     </LinearLayout>
 
@@ -79,7 +75,7 @@
         <ImageView
             android:layout_width="48dp"
             android:layout_height="48dp"
-            android:src="@drawable/ic_no_items" />
+            android:src="@drawable/ic_file" />
 
         <TextView
             android:id="@+id/noItemsTxt"

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

@@ -10,8 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_margin="4dp"
-        app:cardCornerRadius="8dp"
+        app:cardCornerRadius="8dp">
-        app:cardElevation="2dp">
 
         <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"

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

@@ -1,24 +1,33 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<com.google.android.material.card.MaterialCardView 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="horizontal"
-    android:padding="12dp"
+    android:layout_margin="3dp"
     android:gravity="center_vertical">
 
-    <ImageView
+    <LinearLayout
-        android:id="@+id/folderIcon"
-        android:layout_width="34dp"
-        android:layout_height="34dp"
-        android:src="@drawable/ic_folder"
-        app:tint="?attr/colorPrimary" />
-
-    <TextView
-        android:id="@+id/folderName"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginStart="16dp"
+        android:padding="12dp"
-        android:textSize="18sp"/>
+        android:orientation="horizontal"
+        android:gravity="center_vertical">
+        <ImageView
+            android:id="@+id/folderIcon"
+            android:layout_width="34dp"
+            android:layout_height="34dp"
+            android:src="@drawable/ic_folder"
+            app:tint="?attr/colorPrimary" />
 
-</LinearLayout> 
+        <TextView
+            android:id="@+id/folderName"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="16dp"
+            android:textSize="18sp"/>
+    </LinearLayout>
+
+
+
+</com.google.android.material.card.MaterialCardView>

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

@@ -15,13 +15,12 @@
 
 
 
-            <androidx.cardview.widget.CardView
+            <com.google.android.material.card.MaterialCardView
                 android:id="@+id/cardView"
                 android:layout_width="match_parent"
                 android:layout_height="0dp"
                 app:cardCornerRadius="10dp"
                 android:layout_margin="5dp"
-                app:cardElevation="3dp"
                 app:layout_constraintBottom_toBottomOf="parent"
                 app:layout_constraintDimensionRatio="1:1"
                 app:layout_constraintEnd_toEndOf="parent"
@@ -49,7 +48,7 @@
 
 
 
-            </androidx.cardview.widget.CardView>
+            </com.google.android.material.card.MaterialCardView>
 
         </androidx.constraintlayout.widget.ConstraintLayout>
         <ImageView

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

@@ -42,7 +42,6 @@
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         app:cardCornerRadius="15dp"
-        app:cardElevation="10dp"
         android:layout_margin="20dp">
         <LinearLayout
             android:layout_width="match_parent"

app/src/main/res/values-night/themes.xml

@@ -11,6 +11,7 @@
         <item name="android:statusBarColor">@android:color/transparent</item>
         <item name="android:navigationBarColor">@android:color/transparent</item>
         <item name="android:windowLightStatusBar">false</item>
+        <item name="colorSecondaryContainer">#481A4324</item>
         <item name="android:windowLightNavigationBar" tools:targetApi="o_mr1">false</item>
     </style>
 

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

@@ -64,7 +64,7 @@
     <string name="unknown_file">Unknown File</string>
     <string name="details"> DETAILS</string>
     <string name="audio_hidded_successfully">Audios hidden successfully</string>
-    <string name="no_items_available_add_one_by_clicking_on_the_plus_button">No Items Available, Add one by clicking on the</string>
+    <string name="no_items_available_add_one_by_clicking_on_the_plus_button">No Files Available, Add one by clicking on the \'+\' button</string>
     <string name="now_enter_button">Now Enter \'=\' button</string>
     <string name="enter_123456">Enter 123456</string>
     <string name="create_folder">Create Folder</string>
@@ -126,4 +126,26 @@
     <string name="security_question_for_password_reset">Security Question (For Password Reset)</string>
     <string name="security_answer">Security Answer</string>
     <string name="save_password">Save Password</string>
+    <string name="there_is_no_folders_available_create_one_by_clicking_on_the_add_folder_button_showing_in_the_bottom">There is no Folders Available, create one by clicking on the \'Add Folder\' Button showing in the bottom.</string>
+    <string name="storage_permission">Storage Permission</string>
+    <string name="to_ensure_the_app_works_properly_and_allows_you_to_easily_hide_or_un_hide_your_private_files_please_grant_storage_access_permission">To ensure the app works properly and allows you to easily hide or un-hide your private files, please grant storage access permission.\n</string>
+    <string name="for_devices_running_android_11_or_higher_you_ll_need_to_grant_the_all_files_access_permission">For devices running Android 11 or higher, you\'ll need to grant the \'All Files Access\' permission.</string>
+    <string name="grant_permission">Grant Permission</string>
+    <string name="later">Later</string>
+    <string name="storage_permission_is_required_for_the_app_to_function_properly">Storage permission is required for the app to function properly</string>
+    <string name="you_can_grant_permission_later_from_settings">You can grant permission later from Settings</string>
+    <string name="permission_granted">Permission granted</string>
+    <string name="permission_denied">Permission denied</string>
+    <string name="github_profile">https://github.com/binondi</string>
+    <string name="calculator_hide_files">%1$s/calculator-hide-files</string>
+    <string name="would_you_like_to_set_a_specific_theme_mode">Would you like to set a specific theme mode?</string>
+    <string name="no">No</string>
+    <string name="could_not_open_url">Could not open URL</string>
+    <string name="files_copied_successfully">Files copied successfully</string>
+    <string name="some_files_could_not_be_copied">Some files could not be copied</string>
+    <string name="files_moved_successfully">Files moved successfully</string>
+    <string name="some_files_could_not_be_moved">Some files could not be moved</string>
+    <string name="ok">OK</string>
+    <string name="if_you_turn_on_off_this_option_dynamic_theme_changes_will_be_visible_after_you_reopen_the_app">If you turn on/off this option, dynamic theme changes will be visible after you reopen the app.</string>
+    <string name="attention">Attention!</string>
 </resources>

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

@@ -12,6 +12,7 @@
         <item name="android:statusBarColor">@android:color/transparent</item>
         <item name="android:navigationBarColor">@android:color/transparent</item>
         <item name="colorControlNormal">#483CFF61</item>
+        <item name="colorSecondaryContainer">#48BDFFCB</item>
 
         <item name="android:windowLightStatusBar">true</item>
         <item name="android:windowLightNavigationBar" tools:targetApi="o_mr1">true</item>