Introduced the disable title option for custom apps.

buildSrc/src/main/kotlin/custom/CustomApp.kt

@@ -34,7 +34,8 @@ data class CustomApp(
   val versionName: String,
   val disableSideBar: Boolean = false,
   val disableTabs: Boolean = false,
-  val disableReadAloud: Boolean = false
+  val disableReadAloud: Boolean = false,
+  val disableTitle: Boolean = false
 ) {
   constructor(name: String, parsedJson: JSONObject) : this(
     name,
@@ -44,7 +45,8 @@ data class CustomApp(
     readVersionOrInfer(parsedJson),
     parsedJson.getAndCast("disable_sidebar") ?: false,
     parsedJson.getAndCast("disable_tabs") ?: false,
-    parsedJson.getAndCast("disable_read_aloud") ?: false
+    parsedJson.getAndCast("disable_read_aloud") ?: false,
+    parsedJson.getAndCast("disable_title") ?: false
   )
 
   val versionCode: Int = formatCurrentDate("YYDDD0").toInt()

buildSrc/src/main/kotlin/custom/CustomApps.kt

@@ -51,6 +51,7 @@ fun ProductFlavors.create(customApps: List<CustomApp>) {
       buildConfigField("Boolean", "DISABLE_SIDEBAR", "${customApp.disableSideBar}")
       buildConfigField("Boolean", "DISABLE_TABS", "${customApp.disableTabs}")
       buildConfigField("Boolean", "DISABLE_READ_ALOUD", "${customApp.disableReadAloud}")
+      buildConfigField("Boolean", "DISABLE_TITLE", "${customApp.disableTitle}")
       configureStrings(customApp.displayName)
     }
   }

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

@@ -938,7 +938,15 @@ abstract class CoreReaderFragment :
     }
   }
 
-  private fun updateTitle() {
+  /**
+   * Sets the title for toolbar, controlling the title of toolbar.
+   * Subclasses like CustomReaderFragment override this method to provide custom
+   * behavior, such as hiding the title when configured not to show it.
+   *
+   * WARNING: If modifying this method, ensure thorough testing with custom apps
+   * to verify proper functionality.
+   */
+  open fun updateTitle() {
     if (isAdded) {
       actionBar?.title = getValidTitle(zimReaderContainer?.zimFileTitle)
     }

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

@@ -57,6 +57,7 @@ class CustomReaderFragment : CoreReaderFragment() {
   var dialogShower: DialogShower? = null
   private var permissionRequiredDialog: Dialog? = null
   private var appSettingsLaunched = false
+  @Suppress("NestedBlockDepth")
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     super.onViewCreated(view, savedInstanceState)
     if (enforcedLanguage()) {
@@ -71,7 +72,14 @@ class CustomReaderFragment : CoreReaderFragment() {
       }
       with(activity as AppCompatActivity) {
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
-        toolbar?.let { setupDrawerToggle(it) }
+        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
+            it.setNavigationIcon(R.mipmap.ic_launcher)
+          }
+        }
       }
       loadPageFromNavigationArguments()
     }
@@ -239,6 +247,23 @@ class CustomReaderFragment : CoreReaderFragment() {
     super.configureWebViewSelectionHandler(menu)
   }
 
+  /**
+   * Overrides the method to configure the title of toolbar. When the "setting title" is disabled
+   * in a custom app, this function set the empty toolbar title.
+   */
+  override fun updateTitle() {
+    if (BuildConfig.DISABLE_TITLE) {
+      // Set an empty title for the toolbar because we are handling the toolbar click on behalf of this title.
+      // Since we have increased the zone for triggering search suggestions (see https://github.com/kiwix/kiwix-android/pull/3566),
+      // we need to set this title for handling the toolbar click,
+      // 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 = " "
+    } else {
+      super.updateTitle()
+    }
+  }
+
   override fun createNewTab() {
     newMainPageTab()
   }