FCM Manager

fcm_manager.dart

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import '../../controllers/user/user_controller.dart'; // this is User controller class. It is required to save FCM token

class FCM {
  FCM();

  final String _vapidKey =
      'YOUR WEB TOKEN OF FIREBASE ACCOUNT/yourProject/PROJECT SETTINGS/CLOUD MESSAGING/WEB CONFIGURATION/ WEB PUSH CERTIFICATES/Key Pair';
  String _fcmToken = '';
  final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  Future<void> initialize() async {
    _flutterLocalNotificationsPlugin.initialize(_initializationSettings);
    _getFCMToken();
    _onTokenRefresh();
    onMessageListener();
  }

  Future<void> _getFCMToken() async {
    FirebaseMessaging firebaseM = FirebaseMessaging.instance;

    await firebaseM.requestPermission(
      alert: true,
      announcement: false,
      badge: true,
      carPlay: false,
      criticalAlert: false,
      provisional: false,
      sound: true,
    );

    _flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
            AndroidFlutterLocalNotificationsPlugin>()
        ?.requestPermission();

    if (_fcmToken != '') {
      return;
    }
    if (kIsWeb) {
      _fcmToken =
          await FirebaseMessaging.instance.getToken(vapidKey: _vapidKey) ?? '';
    } else {
      _fcmToken = await FirebaseMessaging.instance.getToken() ?? '';
    }
    await UserController.saveFCM(kIsWeb ? true : false, _fcmToken);
    print('TOKEN: ${_fcmToken} :TOKEN');
    return;
  }

  Future<void> _onTokenRefresh() async {
    FirebaseMessaging.instance.onTokenRefresh.listen((fcmToken) async {
      await UserController.saveFCM(kIsWeb ? true : false, _fcmToken);
    }).onError((err) {
      print('FCM ERROR');
      // Error getting token.
      throw (err);
    });
  }

  Future<void> onMessageListener() async {
    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      RemoteNotification? notification = message.notification;
      AndroidNotification? android = message.notification?.android;
      if (notification != null && android != null) {
        _flutterLocalNotificationsPlugin.show(
            notification.hashCode,
            notification.title,
            notification.body,
            const NotificationDetails(
              android: AndroidNotificationDetails(
                'channel.id', // If you have channel you can use without '',
                'channel.name', // If you have channel you can use without ''
                icon: 'ic_stat_name',
                // other properties...
              ),
            ));
      }
    });
  }

  final InitializationSettings _initializationSettings =
      const InitializationSettings(
          android: AndroidInitializationSettings('ic_stat_name'));
}