Fixed: Virtual keyboard resetting the search in the library.

* The issue was with android 14 device, it is working fine in below devices.
* Improved the back press handling in CoreMainActivity using the latest onBackPressedDispatcher API, ensuring proper functionality on Android 14 and above.
* Enhanced the back press behavior in OnlineLibraryFragment while searching for ZIM files, so the SearchView does not close immediately when the user presses the back button to simply dismiss the keyboard.

app/src/main/java/org/kiwix/kiwixmobile/nav/destination/library/OnlineLibraryFragment.kt

@@ -68,6 +68,7 @@ import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.requestNotificat
 import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.viewModel
 import org.kiwix.kiwixmobile.core.extensions.closeKeyboard
 import org.kiwix.kiwixmobile.core.extensions.coreMainActivity
+import org.kiwix.kiwixmobile.core.extensions.isKeyboardVisible
 import org.kiwix.kiwixmobile.core.extensions.setBottomMarginToFragmentContainerView
 import org.kiwix.kiwixmobile.core.extensions.setUpSearchView
 import org.kiwix.kiwixmobile.core.extensions.snack
@@ -327,8 +328,11 @@ class OnlineLibraryFragment : BaseFragment(), FragmentActivityExtensions {
   }
 
   override fun onBackPressed(activity: AppCompatActivity): FragmentActivityExtensions.Super {
-    getActivity()?.finish()
-    return FragmentActivityExtensions.Super.ShouldNotCall
+    if (isKeyboardVisible()) {
+      closeKeyboard()
+      return FragmentActivityExtensions.Super.ShouldNotCall
+    }
+    return FragmentActivityExtensions.Super.ShouldCall
   }
 
   private fun onRefreshStateChange(isRefreshing: Boolean?) {

core/src/main/AndroidManifest.xml

@@ -55,7 +55,6 @@
     android:fullBackupContent="@xml/backup_rules"
     android:dataExtractionRules = "@xml/data_extraction_rules"
     android:hardwareAccelerated="true"
-    android:enableOnBackInvokedCallback="true"
     android:largeHeap="true"
     android:requestLegacyExternalStorage="true"
     android:resizeableActivity="true"

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

@@ -22,6 +22,8 @@ import android.content.Context
 import android.view.View
 import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
@@ -36,6 +38,11 @@ fun Fragment.toast(stringId: Int, length: Int = Toast.LENGTH_LONG) {
   requireActivity().toast(stringId, length)
 }
 
+fun Fragment.isKeyboardVisible(): Boolean {
+  val insets = ViewCompat.getRootWindowInsets(requireView()) ?: return false
+  return insets.isVisible(WindowInsetsCompat.Type.ime())
+}
+
 fun Fragment.closeKeyboard() {
   val inputMethodManager =
     requireContext().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager

core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreMainActivity.kt

@@ -24,6 +24,7 @@ import android.os.Process
 import android.view.ActionMode
 import android.view.Menu
 import android.view.MenuItem
+import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.ActionBarDrawerToggle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
@@ -47,6 +48,7 @@ import org.kiwix.kiwixmobile.core.CoreApp
 import org.kiwix.kiwixmobile.core.R
 import org.kiwix.kiwixmobile.core.base.BaseActivity
 import org.kiwix.kiwixmobile.core.base.FragmentActivityExtensions
+import org.kiwix.kiwixmobile.core.base.FragmentActivityExtensions.Super.ShouldCall
 import org.kiwix.kiwixmobile.core.data.remote.ObjectBoxToLibkiwixMigrator
 import org.kiwix.kiwixmobile.core.data.remote.ObjectBoxToRoomMigrator
 import org.kiwix.kiwixmobile.core.di.components.CoreActivityComponent
@@ -132,6 +134,7 @@ abstract class CoreMainActivity : BaseActivity(), WebViewProvider {
     }
     downloadManagerBroadcastReceiver.let(::registerReceiver)
     createApplicationShortcuts()
+    handleBackPressed()
   }
 
   @Suppress("DEPRECATION")
@@ -149,6 +152,7 @@ abstract class CoreMainActivity : BaseActivity(), WebViewProvider {
   }
 
   override fun onDestroy() {
+    onBackPressedCallBack.remove()
     downloadManagerBroadcastReceiver.let(::unregisterReceiver)
     super.onDestroy()
   }
@@ -277,28 +281,40 @@ abstract class CoreMainActivity : BaseActivity(), WebViewProvider {
     externalLinkOpener.openExternalUrl(KIWIX_SUPPORT_URL.toUri().browserIntent())
   }
 
-  override fun onBackPressed() {
-    if (navigationDrawerIsOpen()) {
-      closeNavigationDrawer()
-      return
-    }
-    if (activeFragments().filterIsInstance<FragmentActivityExtensions>().isEmpty()) {
-      return super.onBackPressedDispatcher.onBackPressed()
-    }
-    activeFragments().filterIsInstance<FragmentActivityExtensions>().forEach {
-      if (it.onBackPressed(this) == FragmentActivityExtensions.Super.ShouldCall) {
-        if (navController.currentDestination?.id?.equals(readerFragmentResId) == true &&
-          navController.previousBackStackEntry?.destination
-            ?.id?.equals(searchFragmentResId) == false
-        ) {
-          drawerToggle = null
-          finish()
-        } else {
-          super.onBackPressedDispatcher.onBackPressed()
+  private fun handleBackPressed() {
+    onBackPressedDispatcher.addCallback(this, onBackPressedCallBack)
+  }
+
+  private val onBackPressedCallBack =
+    object : OnBackPressedCallback(true) {
+      override fun handleOnBackPressed() {
+        if (navigationDrawerIsOpen()) {
+          closeNavigationDrawer()
+          return
+        }
+        if (activeFragments().filterIsInstance<FragmentActivityExtensions>().isEmpty()) {
+          isEnabled = false
+          return onBackPressedDispatcher.onBackPressed().also {
+            isEnabled = true
+          }
+        }
+        activeFragments().filterIsInstance<FragmentActivityExtensions>().forEach {
+          if (it.onBackPressed(this@CoreMainActivity) == ShouldCall) {
+            if (navController.currentDestination?.id?.equals(readerFragmentResId) == true &&
+              navController.previousBackStackEntry?.destination
+                ?.id?.equals(searchFragmentResId) == false
+            ) {
+              drawerToggle = null
+              finish()
+            } else {
+              isEnabled = false
+              onBackPressedDispatcher.onBackPressed()
+              isEnabled = true
+            }
+          }
         }
       }
     }
-  }
 
   override fun onCreateOptionsMenu(menu: Menu): Boolean {