FirebaseMessagingService Intercept notifications when app closed

Question

can i intercept notifications when my app is closed?
I need for set badge with this library ShortcutBadger

Thanks.

Answer 1

There are 3 types of notifications:

notification: Can be send from the web console or any backend, it has predefines values. If the app is open the behaviour is customizable on onMessageRecieve if the app is closed triggers a default notification. data: a key value pair, only Strings. Can be send from any backend. The behaviour is always defined in onMessageReceived method. notification and data: Combination of previous it will have the behaviour of a notification, the data will be available as extras once the notification is clicked in the default launcher activity. Can be send from the web console or any backend.

A push is a json called Payload which contains those objects:

payload: { data: {...} }

Yes, you can send yourself a data type notification it will always do what you write in the onMessageReceived method inside the MessagingService.

This doc should help you https://firebase.google.com/docs/cloud-messaging/concept-options?hl=es-419

If you dont have a server use Functions.

Since the default notification wont be shown, you will probably want to show your own. If you want to also show a notification then the NotificationCompat class must be called from inside onMessageReceived. The visual notification is not related to the push message, in fact, a visual notification can be triggered by pressing a button.

For creating a visual notification, the best approach is to let Android Studio do it for you. Second click on the packages where your activities .java are, new, then selecet ui-component and there is the notification. It will create a basic template of a notification. Then use those methods inside onMessaReceived passing the info that has to be show to the user.

The docs about the class https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html

And you will probably find this error NotificationCompat.Builder deprecated in Android O

Answer 2

In case you never solved this, the problem is not how you are implementing it within your app, but how the JSON data payload is being sent. See this question and the respective answers for why you are not receiving the messages while they are in the background.

Very short summary is, if you are receiving the notification payload, it will never trigger in the background. If you receive the data payload without notification, you can parse and perform actions while the app is in the background.

Answer 3

do you mean it?

public class AppFcmMessagingsService extends FirebaseMessagingService {

private static final String TAG = "FirebaseMessageService";

@Override
public void onCreate() {
    super.onCreate();
}

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    try {
        if(remoteMessage.getData().size() > 0) {

            final JSONObject jsonObject = new JSONObject(remoteMessage.getData().toString());
            Log.d(TAG,"remoteMessage = " + jsonObject.toString());
            int badgeCount = 1;
            ShortcutBadger.applyCount(getApplicationContext(), badgeCount); 
        }
    } catch (Exception e) {
        Log.e(TAG, "onMessageReceived: ", e);
    }
    if(remoteMessage.getNotification() != null) {
            int badgeCount = 1;
            ShortcutBadger.applyCount(getApplicationContext(), badgeCount); 
             Log.d(TAG, "notification body : " + remoteMessage.getNotification().getBody());
    }
}
}