应用程序终止时的 FCM 推送通知 FLUTTER

Question

I am trying to receive push notifications on ANDROID from the Firebase console when the app is terminated but I get nothing (I have onResume, onMessage and onLaunch callback listeners but I don't even want to handle them in the app yet) I'd just like to get them to show In the tray or lock screen. Is there some Android configuration required?

Answer 1

first answer, I hope will be good.

As you can seehere notifications are handled with onBackgroundMessage even if the app is terminated. Maybe your problem is that you are not sending a Notification but a "Data only" message. In that case you have to set the field "priority": "high"

Also, with the latest release of Flutter and firebase_messaging the methods onResume, onMessage and onLaunch are deprecated. You should substitute them with onMessage, onMessageOpened, onBackground, but you can find definitely more info with the official documentation

Answer 2

Just an addition to @samUser1 answer. When app is terminated this code will handle events.

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

And outside main function parse it. The example below uses AwesomeNotifications package. https://github.com/rafaelsetragni/awesome_notifications/blob/master/example/lib/main.dart

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();

  final res = await AwesomeNotifications().createNotification(
    content: NotificationContent(
      id: Random().nextInt(1000000),
      channelKey: 'channel_name',
      title: 'Hello!',
      body: 'World!',
      notificationLayout: NotificationLayout.Default,
    ),
  );
}