implement open in app feature

app/lib/features/geckoview/features/browser/presentation/widgets/browser_modules/bottom_app_bar.dart

@@ -600,7 +600,7 @@ class ShareMenuButton extends HookConsumerWidget {
       controller: menuController,
       menuChildren: [
         CopyAddressMenuItemButton(selectedTabId: selectedTabId),
-        LaunchExternalMenuItemButton(selectedTabId: selectedTabId),
+        OpenInAppMenuItemButton(selectedTabId: selectedTabId),
         ShareScreenshotMenuItemButton(selectedTabId: selectedTabId),
         ShareMenuItemButton(selectedTabId: selectedTabId),
         ShowQrCodeMenuItemButton(selectedTabId: selectedTabId),

app/lib/features/geckoview/features/browser/presentation/widgets/menu_item_buttons.dart

@@ -22,6 +22,7 @@ import 'dart:ui' as ui;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_material_design_icons/flutter_material_design_icons.dart';
+import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:nullability/nullability.dart';
 import 'package:share_plus/share_plus.dart';
@@ -31,7 +32,7 @@ import 'package:weblibre/features/geckoview/features/browser/presentation/dialog
 import 'package:weblibre/features/geckoview/features/browser/presentation/dialogs/qr_code.dart';
 import 'package:weblibre/features/geckoview/features/tabs/data/database/definitions.drift.dart';
 import 'package:weblibre/features/geckoview/features/tabs/domain/repositories/tab.dart';
-import 'package:weblibre/utils/ui_helper.dart' as ui_helper;
+import 'package:weblibre/presentation/hooks/cached_future.dart';
 
 class ShareMenuItemButton extends HookConsumerWidget {
   const ShareMenuItemButton({super.key, required this.selectedTabId});
@@ -225,23 +226,37 @@ class ShareScreenshotMenuItemButton extends HookConsumerWidget {
   }
 }
 
-class LaunchExternalMenuItemButton extends HookConsumerWidget {
-  const LaunchExternalMenuItemButton({super.key, required this.selectedTabId});
+class OpenInAppMenuItemButton extends HookConsumerWidget {
+  const OpenInAppMenuItemButton({super.key, required this.selectedTabId});
+
+  static final _service = GeckoAppLinksService();
 
   final String? selectedTabId;
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    final tabState = ref.watch(tabStateProvider(selectedTabId));
+    final url = tabState?.url;
+    final hasExternalApp = useCachedFuture(
+      // ignore: discarded_futures useFuture
+      () => url != null ? _service.hasExternalApp(url) : Future.value(false),
+      [url],
+    );
+
+    if (hasExternalApp.data != true) {
+      return const SizedBox.shrink();
+    }
+
     return MenuItemButton(
-      leadingIcon: const Icon(Icons.open_in_browser),
+      leadingIcon: const Icon(Icons.open_in_new),
       closeOnActivate: false,
-      child: const Text('Launch External'),
+      child: const Text('Open in App'),
       onPressed: () async {
-        final tabState = ref.read(tabStateProvider(selectedTabId))!;
+        if (url == null) return;
 
-        await ui_helper.launchUrlFeedback(context, tabState.url);
+        final success = await _service.openAppLink(url);
 
-        if (context.mounted) {
+        if (success && context.mounted) {
           MenuController.maybeOf(context)?.close();
         }
       },

app/lib/features/geckoview/features/browser/presentation/widgets/tab_menu.dart

@@ -388,7 +388,7 @@ class TabMenu extends HookConsumerWidget {
           SubmenuButton(
             menuChildren: [
               CopyAddressMenuItemButton(selectedTabId: selectedTabId),
-              LaunchExternalMenuItemButton(selectedTabId: selectedTabId),
+              OpenInAppMenuItemButton(selectedTabId: selectedTabId),
               ShareScreenshotMenuItemButton(selectedTabId: selectedTabId),
               ShareMenuItemButton(selectedTabId: selectedTabId),
               ShowQrCodeMenuItemButton(selectedTabId: selectedTabId),

app/lib/features/geckoview/features/contextmenu/presentation/candidates/launch_external.dart

@@ -22,30 +22,32 @@ import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:go_router/go_router.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:nullability/nullability.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:weblibre/features/geckoview/features/contextmenu/extensions/hit_result.dart';
-import 'package:weblibre/utils/ui_helper.dart';
 
 class LaunchExternal extends HookConsumerWidget {
   final HitResult hitResult;
 
   const LaunchExternal({super.key, required this.hitResult});
 
+  static final _service = GeckoAppLinksService();
+
   static Future<bool> isSupported(HitResult hitResult) async {
-    return hitResult.tryGetLink().mapNotNull((url) => canLaunchUrl(url)) ??
+    return hitResult.tryGetLink().mapNotNull(
+          (url) => _service.hasExternalApp(url),
+        ) ??
         false;
   }
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     return ListTile(
-      leading: const Icon(Icons.open_in_browser),
-      title: const Text('Launch External'),
+      leading: const Icon(Icons.open_in_new),
+      title: const Text('Open in App'),
       onTap: () async {
         await hitResult.tryGetLink().mapNotNull((url) async {
-          await launchUrlFeedback(context, url);
+          final success = await _service.openAppLink(url);
 
-          if (context.mounted) {
+          if (success && context.mounted) {
             context.pop();
           }
         });

app/lib/features/geckoview/features/contextmenu/presentation/context_menu_dialog.dart

@@ -74,6 +74,7 @@ class ContextMenuDialog extends HookConsumerWidget {
             final isSupported = useCachedFuture(
               // ignore: discarded_futures useFuture
               () => LaunchExternal.isSupported(hitResult),
+              [hitResult],
             );
 
             if (isSupported.data == false) {

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/api/GeckoAppLinksApiImpl.kt

@@ -0,0 +1,68 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+package eu.weblibre.flutter_mozilla_components.api
+
+import android.content.Context
+import android.content.Intent
+import eu.weblibre.flutter_mozilla_components.GlobalComponents
+import eu.weblibre.flutter_mozilla_components.pigeons.GeckoAppLinksApi
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.launch
+
+/**
+ * Implementation of GeckoAppLinksApi that detects and launches external applications
+ * that can handle URLs.
+ *
+ * This uses Mozilla Android Components' AppLinksUseCases to properly detect if a native
+ * app is available to handle a URL, matching the behavior in Firefox/Fenix.
+ */
+class GeckoAppLinksApiImpl(
+    private val context: Context
+) : GeckoAppLinksApi {
+    companion object {
+        private val coroutineScope = CoroutineScope(Dispatchers.Default + SupervisorJob())
+    }
+
+    private val components by lazy {
+        requireNotNull(GlobalComponents.components) { "Components not initialized" }
+    }
+
+    override fun hasExternalApp(url: String, callback: (Result<Boolean>) -> Unit) {
+        coroutineScope.launch {
+            try {
+                val redirect = components.useCases.appLinksUseCases.appLinkRedirect(url)
+                callback(Result.success(redirect.hasExternalApp()))
+            } catch (e: Exception) {
+                callback(Result.success(false))
+            }
+        }
+    }
+
+    override fun openAppLink(url: String, callback: (Result<Boolean>) -> Unit) {
+        coroutineScope.launch {
+            try {
+                val redirect = components.useCases.appLinksUseCases.appLinkRedirect(url)
+
+                if (!redirect.hasExternalApp()) {
+                    callback(Result.success(false))
+                    return@launch
+                }
+
+                // Set FLAG_ACTIVITY_NEW_TASK to launch in new task
+                // This prevents issues with app task stacks
+                redirect.appIntent?.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+
+                components.useCases.appLinksUseCases.openAppLink.invoke(redirect.appIntent)
+                callback(Result.success(true))
+            } catch (e: Exception) {
+                callback(Result.success(false))
+            }
+        }
+    }
+}

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/api/GeckoBrowserApiImpl.kt

@@ -21,6 +21,7 @@ import eu.weblibre.flutter_mozilla_components.pigeons.BrowserExtensionEvents
 import eu.weblibre.flutter_mozilla_components.pigeons.ContentBlocking
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoAddonEvents
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoAddonsApi
+import eu.weblibre.flutter_mozilla_components.pigeons.GeckoAppLinksApi
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoBookmarksApi
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoBrowserApi
 import eu.weblibre.flutter_mozilla_components.pigeons.GeckoBrowserExtensionApi
@@ -272,6 +273,7 @@ class GeckoBrowserApiImpl : GeckoBrowserApi {
         GeckoSitePermissionsApi.setUp(_flutterPluginBinding.binaryMessenger, GeckoSitePermissionsApiImpl())
         GeckoPublicSuffixListApi.setUp(_flutterPluginBinding.binaryMessenger, GeckoPublicSuffixListApiImpl(profileApplicationContext))
         GeckoTrackingProtectionApi.setUp(_flutterPluginBinding.binaryMessenger, GeckoTrackingProtectionApiImpl())
+        GeckoAppLinksApi.setUp(_flutterPluginBinding.binaryMessenger, GeckoAppLinksApiImpl(profileApplicationContext))
 
         // Viewport API for dynamic toolbar and keyboard handling
         val viewportEvents = GeckoViewportEvents(_flutterPluginBinding.binaryMessenger)

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/pigeons/Gecko.g.kt

@@ -7112,3 +7112,85 @@ interface GeckoTrackingProtectionApi {
     }
   }
 }
+/**
+ * API for detecting and launching external applications that can handle URLs.
+ *
+ * This API wraps Mozilla Android Components' AppLinksUseCases to allow Flutter
+ * code to check if native apps can handle URLs and launch them directly.
+ *
+ * Generated interface from Pigeon that represents a handler of messages from Flutter.
+ */
+interface GeckoAppLinksApi {
+  /**
+   * Checks if an external application is available to handle the given URL.
+   *
+   * This method uses mozilla-components AppLinksUseCases to determine if
+   * a native app can handle the URL (e.g., YouTube app for youtube.com links).
+   *
+   * Returns true if an external app is available, false otherwise.
+   */
+  fun hasExternalApp(url: String, callback: (Result<Boolean>) -> Unit)
+  /**
+   * Opens the URL in an external application if available.
+   *
+   * This method will:
+   * 1. Check if an external app can handle the URL
+   * 2. If available, launch the app directly with Intent.FLAG_ACTIVITY_NEW_TASK
+   * 3. Return true if successfully launched, false otherwise
+   *
+   * Returns true if URL was opened in external app, false if no app available.
+   */
+  fun openAppLink(url: String, callback: (Result<Boolean>) -> Unit)
+
+  companion object {
+    /** The codec used by GeckoAppLinksApi. */
+    val codec: MessageCodec<Any?> by lazy {
+      GeckoPigeonCodec()
+    }
+    /** Sets up an instance of `GeckoAppLinksApi` to handle messages through the `binaryMessenger`. */
+    @JvmOverloads
+    fun setUp(binaryMessenger: BinaryMessenger, api: GeckoAppLinksApi?, messageChannelSuffix: String = "") {
+      val separatedMessageChannelSuffix = if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoAppLinksApi.hasExternalApp$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val urlArg = args[0] as String
+            api.hasExternalApp(urlArg) { result: Result<Boolean> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(GeckoPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(GeckoPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.flutter_mozilla_components.GeckoAppLinksApi.openAppLink$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val urlArg = args[0] as String
+            api.openAppLink(urlArg) { result: Result<Boolean> ->
+              val error = result.exceptionOrNull()
+              if (error != null) {
+                reply.reply(GeckoPigeonUtils.wrapError(error))
+              } else {
+                val data = result.getOrNull()
+                reply.reply(GeckoPigeonUtils.wrapResult(data))
+              }
+            }
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
+    }
+  }
+}

packages/flutter_mozilla_components/lib/flutter_mozilla_components.dart

@@ -8,6 +8,7 @@ export 'src/data/models/load_url_flags.dart';
 export 'src/data/models/source.dart';
 export 'src/domain/entities/default_selection_actions.dart';
 export 'src/domain/services/gecko_addon.dart';
+export 'src/domain/services/gecko_app_links.dart';
 export 'src/domain/services/gecko_bookmarks.dart';
 export 'src/domain/services/gecko_browser.dart';
 export 'src/domain/services/gecko_browser_extension.dart';

packages/flutter_mozilla_components/lib/src/domain/services/gecko_app_links.dart

@@ -0,0 +1,40 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import 'package:flutter_mozilla_components/src/pigeons/gecko.g.dart';
+
+final _api = GeckoAppLinksApi();
+
+/// Service for detecting and launching external applications that can handle URLs.
+///
+/// This service wraps Mozilla Android Components' AppLinksUseCases to allow
+/// checking if native apps can handle URLs and launching them directly.
+/// This matches the behavior in Firefox/Fenix for "Open in App" functionality.
+class GeckoAppLinksService {
+  /// Checks if an external application is available to handle the given URL.
+  ///
+  /// This method uses mozilla-components AppLinksUseCases to determine if
+  /// a native app can handle the URL (e.g., YouTube app for youtube.com links).
+  ///
+  /// @param url The URL to check.
+  /// @return true if an external app is available, false otherwise.
+  Future<bool> hasExternalApp(Uri url) {
+    return _api.hasExternalApp(url.toString());
+  }
+
+  /// Opens the URL in an external application if available.
+  ///
+  /// This method will:
+  /// 1. Check if an external app can handle the URL
+  /// 2. If available, launch the app directly with Intent.FLAG_ACTIVITY_NEW_TASK
+  /// 3. Return true if successfully launched, false otherwise
+  ///
+  /// @param url The URL to open in external app.
+  /// @return true if URL was opened in external app, false if no app available.
+  Future<bool> openAppLink(Uri url) {
+    return _api.openAppLink(url.toString());
+  }
+}

packages/flutter_mozilla_components/lib/src/pigeons/gecko.g.dart

@@ -8272,3 +8272,89 @@ class GeckoTrackingProtectionApi {
     }
   }
 }
+
+/// API for detecting and launching external applications that can handle URLs.
+///
+/// This API wraps Mozilla Android Components' AppLinksUseCases to allow Flutter
+/// code to check if native apps can handle URLs and launch them directly.
+class GeckoAppLinksApi {
+  /// Constructor for [GeckoAppLinksApi].  The [binaryMessenger] named argument is
+  /// available for dependency injection.  If it is left null, the default
+  /// BinaryMessenger will be used which routes to the host platform.
+  GeckoAppLinksApi({BinaryMessenger? binaryMessenger, String messageChannelSuffix = ''})
+      : pigeonVar_binaryMessenger = binaryMessenger,
+        pigeonVar_messageChannelSuffix = messageChannelSuffix.isNotEmpty ? '.$messageChannelSuffix' : '';
+  final BinaryMessenger? pigeonVar_binaryMessenger;
+
+  static const MessageCodec<Object?> pigeonChannelCodec = _PigeonCodec();
+
+  final String pigeonVar_messageChannelSuffix;
+
+  /// Checks if an external application is available to handle the given URL.
+  ///
+  /// This method uses mozilla-components AppLinksUseCases to determine if
+  /// a native app can handle the URL (e.g., YouTube app for youtube.com links).
+  ///
+  /// Returns true if an external app is available, false otherwise.
+  Future<bool> hasExternalApp(String url) async {
+    final pigeonVar_channelName = 'dev.flutter.pigeon.flutter_mozilla_components.GeckoAppLinksApi.hasExternalApp$pigeonVar_messageChannelSuffix';
+    final pigeonVar_channel = BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture = pigeonVar_channel.send(<Object?>[url]);
+    final pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
+    if (pigeonVar_replyList == null) {
+      throw _createConnectionError(pigeonVar_channelName);
+    } else if (pigeonVar_replyList.length > 1) {
+      throw PlatformException(
+        code: pigeonVar_replyList[0]! as String,
+        message: pigeonVar_replyList[1] as String?,
+        details: pigeonVar_replyList[2],
+      );
+    } else if (pigeonVar_replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (pigeonVar_replyList[0] as bool?)!;
+    }
+  }
+
+  /// Opens the URL in an external application if available.
+  ///
+  /// This method will:
+  /// 1. Check if an external app can handle the URL
+  /// 2. If available, launch the app directly with Intent.FLAG_ACTIVITY_NEW_TASK
+  /// 3. Return true if successfully launched, false otherwise
+  ///
+  /// Returns true if URL was opened in external app, false if no app available.
+  Future<bool> openAppLink(String url) async {
+    final pigeonVar_channelName = 'dev.flutter.pigeon.flutter_mozilla_components.GeckoAppLinksApi.openAppLink$pigeonVar_messageChannelSuffix';
+    final pigeonVar_channel = BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture = pigeonVar_channel.send(<Object?>[url]);
+    final pigeonVar_replyList = await pigeonVar_sendFuture as List<Object?>?;
+    if (pigeonVar_replyList == null) {
+      throw _createConnectionError(pigeonVar_channelName);
+    } else if (pigeonVar_replyList.length > 1) {
+      throw PlatformException(
+        code: pigeonVar_replyList[0]! as String,
+        message: pigeonVar_replyList[1] as String?,
+        details: pigeonVar_replyList[2],
+      );
+    } else if (pigeonVar_replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (pigeonVar_replyList[0] as bool?)!;
+    }
+  }
+}

packages/flutter_mozilla_components/pigeons/gecko.dart

@@ -1977,3 +1977,34 @@ abstract class GeckoTrackingProtectionApi {
   @async
   void removeAllExceptions();
 }
+
+// =============================================================================
+// App Links API
+// =============================================================================
+
+/// API for detecting and launching external applications that can handle URLs.
+///
+/// This API wraps Mozilla Android Components' AppLinksUseCases to allow Flutter
+/// code to check if native apps can handle URLs and launch them directly.
+@HostApi()
+abstract class GeckoAppLinksApi {
+  /// Checks if an external application is available to handle the given URL.
+  ///
+  /// This method uses mozilla-components AppLinksUseCases to determine if
+  /// a native app can handle the URL (e.g., YouTube app for youtube.com links).
+  ///
+  /// Returns true if an external app is available, false otherwise.
+  @async
+  bool hasExternalApp(String url);
+
+  /// Opens the URL in an external application if available.
+  ///
+  /// This method will:
+  /// 1. Check if an external app can handle the URL
+  /// 2. If available, launch the app directly with Intent.FLAG_ACTIVITY_NEW_TASK
+  /// 3. Return true if successfully launched, false otherwise
+  ///
+  /// Returns true if URL was opened in external app, false if no app available.
+  @async
+  bool openAppLink(String url);
+}