Flutter 推送通知 FCM 在启动时无法导航

Question

有一个颤振应用程序。正在使用 FCM 发送推送通知。

所需的行为是在单击通知时，它应该进入显示通知详细信息的屏幕。该屏幕已实现。

在应用程序处于后台时单击通知，单击将进入所需的屏幕，但当应用程序在单击时启动时，它打开的是主屏幕而不是所需的通知屏幕。

推送通知服务代码。

class PushNotificationsManager {

  PushNotificationsManager._();

  factory PushNotificationsManager() => _instance;

  static final PushNotificationsManager _instance = PushNotificationsManager._();

  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  bool _initialized = false;

  Future<void> init() async {
    if (!_initialized) {
      // For iOS request permission first.
      _firebaseMessaging.requestNotificationPermissions();
      //configure
      _firebaseMessaging.configure(
        //Triggered if a message is received whilst the app is in foreground
        onMessage: (Map<String, dynamic> message) async {
          print("onMessage: $message");
//          _navigateToItemDetail(message);
//          _showItemDialog(message);
        },
        //this line causes hot reload error
//        onBackgroundMessage: myBackgroundMessageHandler,
        //Triggered if a message is received if the app was terminated
        onLaunch: (Map<String, dynamic> message) async {
          print("onLaunch: $message");
          _navigateToItemDetail(message);
        },
        //Triggered if a message is received whilst the app is in background
        onResume: (Map<String, dynamic> message) async {
          print("onResume: $message");
          _navigateToItemDetail(message);
        },
      );

      // For testing purposes print the Firebase Messaging token
      String token = await _firebaseMessaging.getToken();
      print("FirebaseMessaging token: $token");

      _initialized = true;
    }
  }


  void _navigateToItemDetail(Map<String, dynamic> message) {
    print("Navigating to notification screen");
    bool isValid = message["data"]["title"] != null && message["data"]["body"] != null;

    if(!isValid) return;

    navigatorKey.currentState.pushNamedAndRemoveUntil(notificationScreenRoute, (route) => false, arguments: message);
   // navigatorKey.currentState.pushNamed(notificationScreenRoute, arguments: message);
  }
}

main.dart -- 这里我正在初始化推送通知服务

//global navigator key,used where buildContext is not available (in business logic)
final GlobalKey<NavigatorState> navigatorKey = new GlobalKey<NavigatorState>();

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  //init Hive
  await initHiveDb();

  PushNotificationsManager _pushNotificationManager = PushNotificationsManager();
  _pushNotificationManager.init();

  // get the dynamic link service
  final DynamicLinkService _dynamicLinkService = DynamicLinkService();
  // call handle dynamic links
  await _dynamicLinkService.handleDynamicLinks();

  //run app, restrict orientaton to portrait up
  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
      systemNavigationBarColor: kMaroonColor
  ));
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]).then((_) {
    runApp(
      MaterialApp(
        debugShowCheckedModeBanner: true,
        theme: (appLightTheme).copyWith(
            //textTheme: GoogleFonts.latoTextTheme()
        ),
        onGenerateRoute: RouteGenerator.generateRoute,
        navigatorKey: navigatorKey,
        home: App()
      )
    );
  });
}

Answer 1

当您的应用未运行时，扩展 FlutterFragmentActivity 的 MainActivity 也未运行。因此，由于您在启动应用程序时 FlutterActivity 尚未准备好，因此您无法在 Flutter 页面之间导航，直到它被加载