flutter - firebase_messaging onResume and onLaunch not working

Question

I am getting the notification when the app is in the foreground but not when the app in the background. Also, I have google-ed/StackOverflow-ed for like 2 hours or more but able to resolves this.

My Configurations are :

  firebase_auth: ^0.10.0
  firebase_messaging: ^5.0.0

The manifest is like this:

The code is like this:

final notifications = new FirebaseMessaging();

class AppNotifications {
  static String fcmToken = '';

  static Future<Null> init() async {
    appLogs("AppNotifications init");

    notifications.requestNotificationPermissions(const IosNotificationSettings(sound: true, badge: true, alert: true));

    await configure();

    fcmToken = await notifications.getToken();
    appLogs("FCM TOKEN : " + fcmToken);

    notifications.onTokenRefresh.listen((newToken) {
      fcmToken = newToken;
      appLogs("FCM TOKEN onTokenRefresh: " + fcmToken);
    });

    await updateFCMToken();
  }

  static Future<Null> configure() async {
    appLogs("AppNotifications Configure");

    notifications.configure(onMessage: (msg) {
      appLogs('FCM onMessage: ' + msg.toString());
    }, onLaunch: (lun) {
      appLogs('FCM onLaunch: ' + lun.toString());
    }, onResume: (res) {
      appLogs('FCM onResume: ' + res.toString());
    });
  }

  static Future<Null> updateFCMToken() async {
    auth.currentUser.fcmToken = fcmToken;
    await updateUserInSharedPreference();
  }
}

I am calling the function like this:

class HomeScreenState extends State<HomeScreen> {


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

    Future.delayed(Duration(milliseconds: 100), () async {
      await AppNotifications.init();
    });
  }

..... ....

I am using postman for sending the notification :

My logs :

**(App is Foreground)**  I/flutter (31888): APPLOGS : FCM onMessage: {notification: {title: Test notification title, body: Test notification body}, data: {status: done, id: 1, foo: bar, click_action: FLUTTER_NOTIFICATION_CLICK}}
  **(App is Background)**  W/FirebaseMessaging(31888): Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.

Flutter doctor :

[?] Flutter (Channel stable, v1.2.1, on Mac OS X 10.14.4 18E226, locale en-GB)
    ? Flutter version 1.2.1 at /Users/Ajay/SDK/flutter
    ? Framework revision 8661d8aecd (3 months ago), 2019-02-14 19:19:53 -0800
    ? Engine revision 3757390fa4
    ? Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)

[?] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ? Android SDK at /Users/Ajay/Library/Android/sdk
    ? Android NDK location not configured (optional; useful for native profiling support)
    ? Platform android-28, build-tools 28.0.3
    ? Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    ? Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
    ? All Android licenses accepted.

[?] iOS toolchain - develop for iOS devices (Xcode 10.2.1)
    ? Xcode at /Applications/Xcode.app/Contents/Developer
    ? Xcode 10.2.1, Build version 10E1001
    ? ios-deploy 1.9.4
    ? CocoaPods version 1.6.0

[?] Android Studio (version 3.3)
    ? Android Studio at /Applications/Android Studio.app/Contents
    ? Flutter plugin version 34.0.1
    ? Dart plugin version 182.5215
    ? Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[!] VS Code (version 1.33.1)
    ? VS Code at /Applications/Visual Studio Code.app/Contents
    ? Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[?] Connected device (1 available)
    ? ONEPLUS A5000 ? b47e8396 ? android-arm64 ? Android 9 (API 28)

Answer 1

lost my 2 days to fix this issue, it may helpful for you. notification tag only for showing notification. you can access only data content on onResume/onLaunch.

If you want handle notification message inside onResume/onLaunch add those messages in data tag also, Then you can do what ever you want.

refer more detail on this link

send this notification message

{
       "notification": {
          "body": "body",
          "title": "title"
       },
       "priority": "high",
       "data": {
        "body": "body",
          "title": "title"
          "click_action": "FLUTTER_NOTIFICATION_CLICK",
          "id": "1",
          "status": "done",
          "image": "https://ibin.co/2t1lLdpfS06F.png",
       },
       "to": <your token>
    }

you will receive below information onResume or onLaunch, your notification tag will be empty here

{notification: {}, data: {image: https://ibin.co/2t1lLdpfS06F.png, google.original_priority: high, google.sent_time: 1560858283888, google.delivered_priority: high, body: body , title: title, click_action: FLUTTER_NOTIFICATION_CLICK, google.message_id: 0:1560858283908500%eefdc741eefdc741, collapse_key: <package>, google.ttl: 2419200, from: <from>, id: 1, status: done}}

you can use title and body which is added in data tag.