The app icon will no longer automatically be replaced with three lines after closing the tabs screen in custom apps when the custom app is configured not to show the title.

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

@@ -64,6 +64,7 @@ import androidx.annotation.AnimRes
 import androidx.appcompat.app.ActionBar
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
+import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.constraintlayout.widget.Group
 import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.app.ActivityCompat
@@ -183,6 +184,10 @@ abstract class CoreReaderFragment :
   @BindView(R2.id.toolbar)
   var toolbar: Toolbar? = null
 
+  @JvmField
+  @BindView(R2.id.toolbarWithSearchPlaceholder)
+  var toolbarWithSearchPlaceholder: ConstraintLayout? = null
+
   @JvmField
   @BindView(R2.id.fragment_main_app_bar)
   var toolbarContainer: AppBarLayout? = null
@@ -763,7 +768,7 @@ abstract class CoreReaderFragment :
     actionBar?.apply {
       setDisplayShowTitleEnabled(true)
     }
-    toolbar?.let((requireActivity() as CoreMainActivity)::setupDrawerToggle)
+    toolbar?.let(::setUpDrawerToggle)
     setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
     closeAllTabsButton?.setImageDrawable(
       ContextCompat.getDrawable(requireActivity(), R.drawable.ic_close_black_24dp)
@@ -784,6 +789,18 @@ abstract class CoreReaderFragment :
     setTopMarginToWebViews(0)
   }
 
+  /**
+   * Sets the drawer toggle, controlling the toolbar.
+   * Subclasses like CustomReaderFragment override this method to provide custom
+   * behavior, such as set the app icon on hamburger when configure to not show the title.
+   *
+   * WARNING: If modifying this method, ensure thorough testing with custom apps
+   * to verify proper functionality.
+   */
+  open fun setUpDrawerToggle(toolbar: Toolbar) {
+    toolbar.let((requireActivity() as CoreMainActivity)::setupDrawerToggle)
+  }
+
   /**
    * Sets the lock mode for the drawer, controlling whether the drawer can be opened or closed.
    * Subclasses like CustomReaderFragment override this method to provide custom

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

@@ -23,12 +23,14 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
 import android.widget.ImageView
 import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.widget.Toolbar
 import androidx.drawerlayout.widget.DrawerLayout
 import androidx.navigation.fragment.findNavController
 import org.kiwix.kiwixmobile.core.base.BaseActivity
-import org.kiwix.kiwixmobile.core.extensions.ActivityExtensions.setupDrawerToggle
 import org.kiwix.kiwixmobile.core.extensions.getResizedDrawable
 import org.kiwix.kiwixmobile.core.extensions.isFileExist
 import org.kiwix.kiwixmobile.core.main.CoreReaderFragment
@@ -75,23 +77,31 @@ class CustomReaderFragment : CoreReaderFragment() {
       }
       with(activity as AppCompatActivity) {
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
-        toolbar?.let {
-          setupDrawerToggle(it)
-          if (BuildConfig.DISABLE_TITLE) {
-            // if the title is disable then set the app logo to hamburger icon,
-            // see https://github.com/kiwix/kiwix-android/issues/3528#issuecomment-1814905330
-            val iconSize =
-              resources.getDimensionPixelSize(dimen.hamburger_icon_size)
-            getResizedDrawable(R.mipmap.ic_launcher, iconSize, iconSize)?.let { drawable ->
-              it.navigationIcon = drawable
-            }
-          }
-        }
+        toolbar?.let(::setUpDrawerToggle)
       }
       loadPageFromNavigationArguments()
     }
   }
 
+  /**
+   * Overrides the method to configure the hamburger icon. When the "setting title" is disabled
+   * in a custom app, this function set the app logo on hamburger.
+   */
+  override fun setUpDrawerToggle(toolbar: Toolbar) {
+    if (BuildConfig.DISABLE_TITLE) {
+      // if the title is disable then set the app logo to hamburger icon,
+      // see https://github.com/kiwix/kiwix-android/issues/3528#issuecomment-1814905330
+      val iconSize =
+        resources.getDimensionPixelSize(dimen.hamburger_icon_size)
+      requireActivity().getResizedDrawable(R.mipmap.ic_launcher, iconSize, iconSize)
+        ?.let { drawable ->
+          toolbar.navigationIcon = drawable
+        }
+    } else {
+      super.setUpDrawerToggle(toolbar)
+    }
+  }
+
   private fun loadPageFromNavigationArguments() {
     val args = CustomReaderFragmentArgs.fromBundle(requireArguments())
     if (args.pageUrl.isNotEmpty()) {
@@ -226,7 +236,8 @@ class CustomReaderFragment : CoreReaderFragment() {
         urlIsValid(),
         this,
         BuildConfig.DISABLE_READ_ALOUD,
-        BuildConfig.DISABLE_TABS
+        BuildConfig.DISABLE_TABS,
+        BuildConfig.DISABLE_TITLE
       )
     }
   }
@@ -266,7 +277,9 @@ class CustomReaderFragment : CoreReaderFragment() {
       // even if it is empty. If we do not set up this title,
       // the search screen will open if the user clicks on the toolbar from the tabs screen.
       actionBar?.title = " "
+      toolbarWithSearchPlaceholder?.visibility = VISIBLE
     } else {
+      toolbarWithSearchPlaceholder?.visibility = GONE
       super.updateTitle()
     }
   }