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Flutter App Firebase Push Notification Not Coming In Background

I am facing issue received notifications when app terminated/Remove from recent apps from background.

I have complete all the setup required for android app in build.gradle files both app or project level. I am able to receive push notification when app is open or when app is in the recent apps.

Library versions

firebase_messaging: ^11.2.0
firebase_core: ^1.10.0
flutter_local_notifications: ^9.1.4

here is my code.

await Firebase.initializeApp();
    FirebaseMessaging messaging = FirebaseMessaging.instance;

    messaging.getToken().then((value) {
      print('firebase token =$value');    
    });

    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      //print(event.notification!.body);
      RemoteNotification? notification = message.notification;
      if (notification != null) {
        print("Notification received when app in foreground");
      }
    });

    FirebaseMessaging.onMessageOpenedApp.listen((message) {
      print('Message clicked!');
    });

    await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,
    );

BackgroundMessage handler code is below

Future<void> _messageHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  RemoteNotification? notification = message.notification;
  if (notification != null) {
    print("Notification received when app in background");
  }
}

Below is my complete code of main.dart file

Future<void> _messageHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  RemoteNotification? notification = message.notification;
  if (notification != null) {
    print("Notification received when app in background");
  }
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(_messageHandler);
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool isUserLoggedIn = true;
  bool isLogoutAlertShown = false;
  final materialAppKey = GlobalKey();
  late FirebaseMessaging messaging;


  @override
  void initState() {
    super.initState();
    setUpNotification();
  }

  setUpNotification() async {
    messaging = FirebaseMessaging.instance;
    messaging.getToken().then((value) {
      print('firebase token =$value');
      //sendTokenToServer(value);
      Pref.setFcmToken(token: '$value');
    });
    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      //print(event.notification!.body);
      RemoteNotification? notification = message.notification;
      if (notification != null) {
        print("Notification received when app in foreground");
      }
    });
    FirebaseMessaging.onMessageOpenedApp.listen((message) {
      print('Message clicked!');
    });
   await FirebaseMessaging.instance.setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,
    );
  }

  @override
  Widget build(BuildContext context) {
    return _materialApp();
  }

  Widget _materialApp() {
    return FutureBuilder(
        future: _loginState(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            return MaterialApp(
              debugShowCheckedModeBanner: false,
              key: materialAppKey,
              darkTheme: AppTheme.lightTheme,
              theme: AppTheme.lightTheme,
              home: isUserLoggedIn == true ? 
              BottomNavigationContainer() : LoginOptions(),
            );
          } else {
            return Container(color: Colors.white);
          }
        });
  }

  Future<void> _loginState() async {
    final token = await Pref.getToken();
    isUserLoggedIn = token.length > 0 ? true : false;
  }
}

Suggest me what I am missing or doing wrong.

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Answer

Thank to all for your response.

I Found the solution that why my background handler not working because I am running my app in Debugging mode. As per the FlutterFire Cloud messaging Doc background method not work in Debugging mode if you kill your app.

You can test your background handler method by run your application in debug and then background it by switching apps so it's no longer in the foreground.

If You want to check After app terminate/kill from recent task then Run app in Release Mode. It Works fine

Again thanks to All.

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source: stackoverflow.com
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