Firebase (FCM) registration token in Flutter

问题

I am trying to send notification from Java Rest Api (using Firebase Admin sdk) to my Flutter application and it seems it requires device token to send notification and I cannot find how to get that token. I am new to Flutter and android and may be missing any of the crucial step. Please help me if you can. Thanks.

回答1:

Add this to your package's pubspec.yaml file:

dependencies:
  firebase_messaging: ^4.0.0+1

You can install packages from the command line:

with Flutter:

$ flutter packages get

Now in your Dart code, you can use:

import 'package:firebase_messaging/firebase_messaging.dart';

Implementation:

FirebaseMessaging _firebaseMessaging = FirebaseMessaging();



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

void firebaseCloudMessaging_Listeners() {
  if (Platform.isIOS) iOS_Permission();

  _firebaseMessaging.getToken().then((token){
    print(token);
  });

  _firebaseMessaging.configure(
    onMessage: (Map<String, dynamic> message) async {
      print('on message $message');
    },
    onResume: (Map<String, dynamic> message) async {
      print('on resume $message');
    },
    onLaunch: (Map<String, dynamic> message) async {
      print('on launch $message');
    },
  );
}

void iOS_Permission() {
  _firebaseMessaging.requestNotificationPermissions(
      IosNotificationSettings(sound: true, badge: true, alert: true)
  );
  _firebaseMessaging.onIosSettingsRegistered
      .listen((IosNotificationSettings settings)
  {
    print("Settings registered: $settings");
  });
}

For more details step by information please refer this link

Hope this helps you

回答2:

We need to add this package in pubspec.yaml file

firebase_messaging: ^4.0.0+1

Perform packages get

Now import this in your code

import 'package:firebase_messaging/firebase_messaging.dart';

Create instance of FirebaseMessaging

  FirebaseMessaging _firebaseMessaging = FirebaseMessaging();

Now we just to add the function which I have created in the answer in the link below

https://stackoverflow.com/a/60523014/11887774

回答3:

As you can the use the firebase Messaging Plugin to send the Notification. Through this code you can print the Token in Console.

final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
_firebaseMessaging.configure(
    onLaunch: (Map<String, dynamic> message) {
      print('onLaunch called');
    },
    onResume: (Map<String, dynamic> message) {
      print('onResume called');
    },
    onMessage: (Map<String, dynamic> message) {
      print('onMessage called');
    },
  );
  _firebaseMessaging.subscribeToTopic('all');
  _firebaseMessaging.requestNotificationPermissions(IosNotificationSettings(
    sound: true,
    badge: true,
    alert: true,
  ));
  _firebaseMessaging.onIosSettingsRegistered
      .listen((IosNotificationSettings settings) {
    print('Hello');
  });
  _firebaseMessaging.getToken().then((token) {
    print(token); // Print the Token in Console
  });
}

回答4:

How would you convert the onmessage future to a stream so that it can be used in a bloc. Ex:

This doesnt work:

Stream<MessagesState> _yieldMessage(Map<String, dynamic> message) async* {
    yield NewMessageState(message: message);
  }

  Stream<MessagesState> _mapToInitialiseFirebaseEvent() async* {
    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage: $message");
        _yieldMessage(message);
      },
      onLaunch: (Map<String, dynamic> message) async {
        print("onLaunch: $message");
        _yieldMessage(message);
      },
      onResume: (Map<String, dynamic> message) async {
        print("onResume: $message");
        _yieldMessage(message);
      },
    );

    _firebaseMessaging.requestNotificationPermissions(const IosNotificationSettings(sound: true, badge: true, alert: true, provisional: true));
    _firebaseMessaging.onIosSettingsRegistered.listen((IosNotificationSettings settings) {
      print("Settings registered: $settings");
    });
    _firebaseMessaging.getToken().then((String token) async {
      assert(token != null);
      print("Push Messaging token: $token");
      Settings settings = await userRepository.loadSettingsFromStore();
      sosRepository.updateUser(User(username: settings.userName, imeinumber: token));
    });
  }

回答5:

I am not clear your question though. For FCM you have to extend FirebaseMessagingService.

Example:

class PNPFirebaseMessagingService : FirebaseMessagingService() {
  override fun onNewToken(token: String?) {
     // you can collect token from here
  }
}

来源：https://stackoverflow.com/questions/54821182/firebase-fcm-registration-token-in-flutter