Improved the edge to edge mode in landscape mode.

* It was showing the content behind the display cutout in landscape mode.
* Removed the unnecessary code from BaseFragment.
* Enhanced the applying edge to edge mode for lower devices(Before Android 10).

app/src/main/java/org/kiwix/kiwixmobile/main/KiwixMainActivity.kt

@@ -129,7 +129,6 @@ class KiwixMainActivity : CoreMainActivity() {
         closeNavigationDrawer()
         onNavigationItemSelected(item)
       }
-      applyEdgeToEdgeInsets()
     }
     activityKiwixMainBinding.bottomNavView.setupWithNavController(navController)
     lifecycleScope.launch {
@@ -138,7 +137,7 @@ class KiwixMainActivity : CoreMainActivity() {
     handleZimFileIntent(intent)
     handleNotificationIntent(intent)
     handleGetContentIntent(intent)
-    readerTableOfContentsDrawer.applyEdgeToEdgeInsets()
+    activityKiwixMainBinding.root.applyEdgeToEdgeInsets()
   }
 
   private suspend fun migrateInternalToPublicAppDirectory() {

core/src/main/java/org/kiwix/kiwixmobile/core/base/BaseFragment.kt

@@ -26,12 +26,10 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.fragment.app.Fragment
 import org.kiwix.kiwixmobile.core.R
-import org.kiwix.kiwixmobile.core.extensions.applyEdgeToEdgeInsets
 import org.kiwix.kiwixmobile.core.extensions.enableEdgeToEdgeMode
 import org.kiwix.kiwixmobile.core.extensions.getToolbarNavigationIcon
 import org.kiwix.kiwixmobile.core.extensions.setFragmentBackgroundColorForAndroid15AndAbove
 import org.kiwix.kiwixmobile.core.extensions.setToolTipWithContentDescription
-import org.kiwix.kiwixmobile.core.main.CoreReaderFragment
 
 /**
  * All fragments should inherit from this fragment.
@@ -56,8 +54,6 @@ abstract class BaseFragment : Fragment() {
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM) {
       setFragmentBackgroundColorForAndroid15AndAbove()
     }
-    // Ignore adding the bottom padding to coreReaderFragment.
-    this.view.applyEdgeToEdgeInsets(this !is CoreReaderFragment)
   }
 
   // Setup toolbar to handle common back pressed event

core/src/main/java/org/kiwix/kiwixmobile/core/error/ErrorActivity.kt

@@ -86,7 +86,7 @@ open class ErrorActivity : BaseActivity() {
     }
     setupReportButton()
     activityKiwixErrorBinding?.restartButton?.setOnClickListener { restartApp() }
-    activityKiwixErrorBinding?.root.applyEdgeToEdgeInsets(true)
+    activityKiwixErrorBinding?.root.applyEdgeToEdgeInsets()
   }
 
   override fun onDestroy() {

core/src/main/java/org/kiwix/kiwixmobile/core/extensions/ViewExtensions.kt

@@ -19,16 +19,18 @@
 package org.kiwix.kiwixmobile.core.extensions
 
 import android.annotation.SuppressLint
+import android.os.Build
 import android.view.View
 import android.view.ViewGroup
 import android.view.Window
+import android.view.WindowManager
 import androidx.annotation.ColorInt
 import androidx.appcompat.widget.TooltipCompat
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
-import androidx.core.view.updatePadding
+import androidx.core.view.updateLayoutParams
 import com.google.android.material.snackbar.BaseTransientBottomBar
 import com.google.android.material.snackbar.Snackbar
 
@@ -91,48 +93,58 @@ fun View.setToolTipWithContentDescription(description: String) {
 
 fun View.showFullScreenMode(window: Window) {
   WindowCompat.setDecorFitsSystemWindows(window, false)
-  WindowInsetsControllerCompat(window, window.decorView).apply {
-    hide(WindowInsetsCompat.Type.systemBars())
-    hide(WindowInsetsCompat.Type.displayCutout())
-    systemBarsBehavior =
-      WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+    WindowInsetsControllerCompat(window, window.decorView).apply {
+      hide(WindowInsetsCompat.Type.systemBars())
+      hide(WindowInsetsCompat.Type.displayCutout())
+      systemBarsBehavior =
+        WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+    }
+  }
+  @Suppress("Deprecation")
+  window.apply {
+    addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)
+    clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN)
   }
 }
 
 fun View.closeFullScreenMode(window: Window) {
   WindowCompat.setDecorFitsSystemWindows(window, false)
-  WindowInsetsControllerCompat(window, window.decorView).apply {
-    show(WindowInsetsCompat.Type.systemBars())
-    show(WindowInsetsCompat.Type.displayCutout())
+  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+    WindowInsetsControllerCompat(window, window.decorView).apply {
+      show(WindowInsetsCompat.Type.systemBars())
+      show(WindowInsetsCompat.Type.displayCutout())
+    }
+  }
+  @Suppress("DEPRECATION")
+  window.apply {
+    addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN)
+    clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN)
   }
 }
 
 /**
- * Adjusts the view's top margin and optionally its bottom padding to handle edge-to-edge insets
- * (e.g., system bars, display cutouts, and system gestures).
+ * Applies edge-to-edge insets to the current view by adjusting its margins
+ * to account for system bars and display cutouts (e.g., status bar, navigation bar, and notches).
  *
- * By default, this method adds bottom padding to avoid content being obscured by the system bar.
- * However, bottom padding can be skipped for specific cases like the reader fragment, where adding
- * it might cause the BottomAppBar to overlap the content.
+ * This method ensures that the view avoids overlapping with system UI components by dynamically
+ * setting margins based on the insets provided by the system.
  *
- * @param shouldAddBottomPadding Whether to add padding to the bottom of the view to handle system insets.
- * Defaults to `true`.
+ * Usage: Call this method on any view to apply edge-to-edge handling.
  */
-fun View?.applyEdgeToEdgeInsets(shouldAddBottomPadding: Boolean = true) {
+fun View?.applyEdgeToEdgeInsets() {
   this?.let {
     ViewCompat.setOnApplyWindowInsetsListener(it) { view, windowInsets ->
-      val insets = windowInsets.getInsets(
-        WindowInsetsCompat.Type.systemBars()
-          or WindowInsetsCompat.Type.displayCutout()
-      )
-      val layoutParams = view.layoutParams as? ViewGroup.MarginLayoutParams
-      layoutParams?.topMargin = insets.top
-      view.layoutParams = layoutParams
-      // Optionally add padding to the bottom to prevent content from being obscured by system bars.
-      if (shouldAddBottomPadding) {
-        val systemBarsInsets =
-          windowInsets.getInsets(WindowInsetsCompat.Type.systemBars())
-        view.updatePadding(bottom = systemBarsInsets.bottom)
+      val systemBarsInsets =
+        windowInsets.getInsets(
+          WindowInsetsCompat.Type.displayCutout() or
+            WindowInsetsCompat.Type.systemBars()
+        )
+      view.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+        topMargin = systemBarsInsets.top
+        leftMargin = systemBarsInsets.left
+        bottomMargin = systemBarsInsets.bottom
+        rightMargin = systemBarsInsets.right
       }
       WindowInsetsCompat.CONSUMED
     }

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

@@ -91,6 +91,8 @@
     <item name="colorAccent">?colorSecondary</item>
     <item name="android:navigationBarColor">@color/black</item>
 
+    <!-- To prevent showing content behind the cutouts -->
+    <item name="android:windowLayoutInDisplayCutoutMode" tools:ignore="NewApi">never</item>
   </style>
 
 </resources>

custom/src/main/java/org/kiwix/kiwixmobile/custom/main/CustomMainActivity.kt

@@ -85,8 +85,7 @@ class CustomMainActivity : CoreMainActivity() {
     super.onCreate(savedInstanceState)
     activityCustomMainBinding = ActivityCustomMainBinding.inflate(layoutInflater)
     setContentView(activityCustomMainBinding.root)
-    drawerNavView.applyEdgeToEdgeInsets()
-    readerTableOfContentsDrawer.applyEdgeToEdgeInsets()
+    activityCustomMainBinding.root.applyEdgeToEdgeInsets()
     if (savedInstanceState != null) {
       return
     }