Doesn't seems notification when user tap on the app directly Android

[yusufnacar]

Hello .

I have an app create with Flutter and I am using Firebase Cloud Messaging to push notification. I can handle all messages onResume, onLaunch perfectly . But there is a problem with that it is just working when user tap on notifications. So if user tap on the app directly, user doesn't have any interactions with the notification and I can't handle on background messages. if user clear all notification , app will lost all messages. I am not sure is it a bug or about I made anything which is not correct. Is there any way to handle to all messages without tap on notifications ?

Regards.

This is my flutter doctor

[✓] Flutter (Channel stable, 1.22.5, on Mac OS X 10.15.6 19G2021 darwin-x64,
    locale en-TR)
    • Flutter version 1.22.5 at /Users/yusufnacar/Desktop/flutter
    • Framework revision 7891006299 (12 days ago), 2020-12-10 11:54:40 -0800
    • Engine revision ae90085a84
    • Dart version 2.10.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/yusufnacar/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.7)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.7, Build version 11E801a
    • CocoaPods version 1.9.3

[✓] Android Studio (version 4.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 49.0.2
    • Dart plugin version 193.7547
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.49.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.14.1

[✓] Connected device (1 available)
    • Android SDK built for x86 64 (mobile) • emulator-5554 • android-x64 • Android 9 (API 28) (emulator)

• No issues found!

and my code

void initState() {
    _registerNotification();
    super.initState();
  }


Future<void> _registerNotification() async {
    FirebaseMessaging firebaseMessaging = FirebaseMessaging();

    await firebaseMessaging.requestNotificationPermissions(
        const IosNotificationSettings(
            alert: true, badge: true, sound: true, provisional: false));
    firebaseMessaging.onIosSettingsRegistered
        .listen((IosNotificationSettings settings) {
      print("Settings registered: $settings");
    });

    firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) {
        print("onMessage");
        print(message);

        _messageHandler(message, 'onMessage');
        return;
      },
      onResume: (Map<String, dynamic> message) {
        print("onResume");
        _messageHandler(message, 'onResume');

        return;
      },
      onLaunch: (Map<String, dynamic> message) {
        print("onLaunch");
        _messageHandler(message, 'onLaunch');
        return;
      },
     
    );
  }

_messageHandler(Map<String, dynamic> message, String type) {
    print("messageHandler");

    final provider = Provider.of<NotificationProvider>(context, listen: false);

    // var msg = message[''aps']['alert''];
    var msg = message['data'];

    print('$type: $msg');

    provider.addNotification(
      MTNotification(
        title: msg['title'],
        content: msg['body'],
        dateTime: DateTime.now(),
        isSeen: false,
      ),
    );
  }