FlutterFirebase push

gistfile1.txt

import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:push/firebase_options.dart';

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  print('Handling a background message ${message.messageId}');
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  //initialize firebase
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );

  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

  FirebaseMessaging.onMessage.listen((RemoteMessage message) {
    print('Got a message whilst in the foreground!');
    print('Message data: ${message.data}');

    if (message.notification != null) {
      print('Message also contained a notification: ${message.notification}');
    }
  });

  FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
    print('A new onMessageOpenedApp event was published!');
    print('Message data: ${message.data}');
  });

  runApp(const Push());
}

class Push extends StatelessWidget {
  const Push({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Push Notifications',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance;

  @override
  void initState() {
    super.initState();
    _firebaseMessaging.getToken().then((String? token) {
      assert(token != null);
      print('Push Messaging token: $token');
    });

    _firebaseMessaging.subscribeToTopic('all');

    _firebaseMessaging.requestPermission(
      alert: true,
      badge: true,
      provisional: false,
      sound: true,
    );
    _firebaseMessaging.getNotificationSettings().then((settings) {
      print('User granted permission: ${settings.authorizationStatus}');
    });

    _firebaseMessaging.onTokenRefresh.listen((String? token) {
      print('Token refreshed: $token');
    });

    _firebaseMessaging.getAPNSToken().then((String? token) {
      print('APNs token: $token');
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Push Notifications'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ElevatedButton(
              onPressed: () {
                _firebaseMessaging.subscribeToTopic('all');
              },
              child: const Text('Subscribe to all'),
            ),
            ElevatedButton(
              onPressed: () {
                _firebaseMessaging.unsubscribeFromTopic('all');
              },
              child: const Text('Unsubscribe from all'),
            ),
          ],
        ),
      ),
    );
  }
}