FirebaseMessaging.instance.getInitialMessage() is not called in terminated state - flutter

Question

FirebaseMessaging.instance.getInitialMessage() is not called in terminated state when we click notification that contains message data like this ,instead it is displaying screen from splash screen
{
"registration_ids": [
""
],
"data": {
"title": "Flutter9 Object Notification.3...",
"body": "this is flutter Data Object notification test message from",
"android_channel_id": "dgdgsdfgs",
},
"android":{
"priority":"high"
}
}

Answer 1

Given that you not displayed how you setup your fcm , here is how to go about it
/// Create a [AndroidNotificationChannel] for heads up notifications
late AndroidNotificationChannel channel;
/// Initialize the [FlutterLocalNotificationsPlugin] package.
late FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;
/// To verify things are working, check out the native platform logs.
Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
// If you're going to use other Firebase services in the background, such as Firestore,
// make sure you call `initializeApp` before using other Firebase services.
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
print('Handling a background message ${message.messageId}');
}
in main.dart
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
// setup displaying notifications
channel = const AndroidNotificationChannel(
'high_importance_channel', // id
'High Importance Notifications', // title// description
importance: Importance.high,
);
flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
/// Create an Android Notification Channel.
///
/// We use this channel in the `AndroidManifest.xml` file to override the
/// default FCM channel to enable heads up notifications.
await flutterLocalNotificationsPlugin
.resolvePlatformSpecificImplementation<
AndroidFlutterLocalNotificationsPlugin>()
?.createNotificationChannel(channel);
/// Update the iOS foreground notification presentation options to allow
/// heads up notifications.
await FirebaseMessaging.instance
.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
handle message call this in your initstate
FirebaseMessaging.instance
.getInitialMessage()
.then((RemoteMessage? message) {
if (message != null) {
// do message things
}
});
FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
showMessage(message: message);
});
FirebaseMessaging.onMessage.listen((RemoteMessage message) {
RemoteNotification? notification = message.notification;
AndroidNotification? android = message.notification?.android;
if (notification != null && android != null) {
flutterLocalNotificationsPlugin.show(
notification.hashCode,
notification.title,
notification.body,
NotificationDetails(
android: AndroidNotificationDetails(
channel.id,
channel.name,
),
iOS: IOSNotificationDetails(subtitle: notification.title)));
}
});
incase you need to navigate on receiving a message
void showMessage({required RemoteMessage message}) async {
if (message.data['route'] == "mypage") {
var myparams = message.data['payload'];
Navigator.of(context).push(MaterialPageRoute(
fullscreenDialog: true,
builder: (_) {
return MyPage(
params:myparams,
);
})); ...

Answer 2

With FCM, you can send two types of messages to clients:
Notification messages, are sometimes thought of as "display messages." These are handled by the FCM SDK automatically.
Data messages, which are handled by the client app. "
https://firebase.google.com/docs/cloud-messaging/concept-options
What you are trying to send is a data message, my best guess is that the firebase SDK does not recognize the data message so it does not trigger the firebase message event listener. Your notification must have a 'notification' field for firebase SDK to listen to.