Flutter：前台通知在 Firebase 消息传递中不起作用

Question

I need to show firebase notifications when the app is on foreground by using local notification but it is not working.

  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin=new FlutterLocalNotificationsPlugin();

  static  FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  static StreamController<Map<String, dynamic>> _onMessageStreamController =
  StreamController.broadcast();
  static StreamController<Map<String, dynamic>> _streamController =
  StreamController.broadcast();
  static final Stream<Map<String, dynamic>> onFcmMessage =
      _streamController.stream;

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

    var android=AndroidInitializationSettings('mipmap/ic_launcher.png');
    var ios=IOSInitializationSettings();
    var platform=new  InitializationSettings(android,ios);
    flutterLocalNotificationsPlugin.initialize(platform);

    firebaseCloudMessaging_Listeners();
  }

Here is the Firebase Code

 void firebaseCloudMessaging_Listeners() {

if (Platform.isIOS) iOS_Permission();

_firebaseMessaging.getToken().then((token) {
  print("FCM TOKEN--" + token);
});
_firebaseMessaging.configure(
  onMessage: (Map<String, dynamic> message) async {
    print('on message $message');
    showNotification(message);
  },
  onResume: (Map<String, dynamic> message) async {
    print('on resume $message');
  },
  onLaunch: (Map<String, dynamic> message) async {
    print('on launch $message');
  },
);


}

This is showNotification method

 void showNotification(Map<String, dynamic> msg) async{
    print(msg);
    var android = new AndroidNotificationDetails(
        'my_package', 'my_organization', 'notification_channel', importance: Importance.Max, priority: Priority.High);
    var iOS = new IOSNotificationDetails();
    var platform=new NotificationDetails(android, iOS);
    await flutterLocalNotificationsPlugin.show(
      0,'My title', 'This is my custom Notification', platform,);
  }

and Firebase Response

{notification: {title: Test Title, body: Test Notification Text}, data: {orderid: 2, click_action: FLUTTER_NOTIFICATION_CLICK, order name: farhana}}

Answer 1

There is an active issue logged on GitHub repository for the package regarding the same. Firebase messaging and local notifications won't work together on iOS since you can register only a single delegate for notifications.

Check out: https://github.com/MaikuB/flutter_local_notifications/issues/111

There's also an active flutter issue for the same: https://github.com/flutter/flutter/issues/22099

Answer 2

Problem: See the Push Notification while application is in foreground.

Solution: I was using firebase_message plugin and I was able to see the Push Notification while application is in foreground by making these few changes in my flutter project's iOS AppDelegate.swift file in flutter project.

import UIKit
import Flutter
import UserNotifications

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, UNUserNotificationCenterDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    // set the delegate in didFinishLaunchingWithOptions
    UNUserNotificationCenter.current().delegate = self
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
    // This method will be called when app received push notifications in foreground
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
    {
        completionHandler([.alert, .badge, .sound])
    }
}

Note: This also works while using with flutter_local_notification plugin but with an issue that onSelectNotification is not working due to changes done above.

Answer 3

You can find the answer in FlutterFire documentation https://firebase.flutter.dev/docs/migration/#messaging

You just add to your code the following line

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

Answer 4

如果没有在前台收到通知，请确保 android 可绘制文件包含 launcher_icon 或您在 showotification 函数中设置的图标。

Answer 5

I also couldn't get firebase notifications with flutter_local_notifications working on iOS in foreground. Background notifications worked fine. Problem was that firebase notification data is different on iOS. Notification data is not ["notification"]["title"] as in android but ["aps"]["alert"]["title"] .