Flutter Firebase Messaging - Handle Notification Navigation For foreground and background clicks

In one of my app want notification handling based on id, whether it is foreground or background. I'm not able to manage it.

What i want is when i receive the push notification, user should be navigated to the respective screens. even if we are on any of the current screen or app is in background. I also have splash screen in between. So, how can i manage the navigation even if i have somethings to fetch from web api and then navigate to some other screen.

I am getting push notification every time whether app is in foreground or background mode. Also, any of the toasts are not shown when notifications are received as per my following code.

I have added following code for notification handling,

  final GlobalKey<NavigatorState> navigatorKey = GlobalKey(debugLabel: "Main Navigator");
  FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  BuildContext _context;

  setupFirebaseMessaging() async {
    if (Platform.isIOS) {
      await _firebaseMessaging.requestNotificationPermissions(
        const IosNotificationSettings(
            sound: true, badge: true, alert: true, provisional: false),
      );
    }

    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage called : ${message.toString()}");
        notiMessage = message;
        getLocalNotification(message);
      },
      onLaunch: (Map<String, dynamic> message) async {
        showToast("onLaunch Called : ${navigatorKey.currentState}", context);
        print("onLaunch called : ${message.toString()}");
        navigateToDetailScreen(message);
      },
      onResume: (Map<String, dynamic> message) async {
        showToast("onResume Called : ${navigatorKey.currentState}", context);
        print("onResume called : ${message.toString()}");
        navigateToDetailScreen(message);
      },
    );
  }

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

    setupFirebaseMessaging();
  }

  @override
  Widget build(BuildContext context) {
    _context = context;
        return MaterialApp(
        navigatorKey: navigatorKey,
        debugShowCheckedModeBanner: false,
        title: 'Test',
        theme: ThemeData(
          primaryColor: primaryColor,
          accentColor: primaryDarkColor,
          // visualDensity: VisualDensity.adaptivePlatformDensity,
        ),
        home: SplashScreen(),
      );

navigateToDetailScreen(Map<String, dynamic> message) async {
  if (message['data']['id'] ==1) {
  navigatorKey.currentState.pushAndRemoveUntil(MaterialPageRoute(builder: (context) => LoginScreen()), (Route<dynamic> route) => false);
  } else if (message['data']['id'] ==2) {
  // some async work
  navigatorKey.currentState.push(MaterialPageRoute(builder: (context) => DetailScreen()));
  } else if (message['data']['id'] ==3) {
  // some async work
  navigatorKey.currentState.push(MaterialPageRoute(builder: (context) => DataScreen()));
  } else {
  // some async work
  navigatorKey.currentState.push(MaterialPageRoute(builder: (context) => HomeScreen()));
  } 
}

Above code doesn't work for my case. I am not able to get navigated to my desired screen. Also, how to survive SplashScreen is your initialscreen when handling notification navigation with async calculation?

Can anyone suggest me a proper way to do so?

Thanks.