FirebaseMessagingService 11.6.0 HandleIntent

Question

The FirebaseMessagingService has the method onMessageReceived() which we should override to handle notifications, but thi

Answer 1

I'd add that in FirebaseMessagingService 11.8.0 docs, it is stated in https://firebase.google.com/docs/cloud-messaging/android/receive that if a notification has a data payload it will call onMessageRecieved() when the app is in the foreground, and if the app is in the background the notification and data payload are delivered in the extras of the intent of your launcher Activity.

So, this means you need to decide how to handle the notification in two places, depending on whether the user is actively using the app or if it is in the background.

As you have seen yourself, if you receive the notification while the app is in the foreground, onMessageReceived() is called and you handle the notification there.

When the app is launched from the background, you have 2 options:

1: By default, the notification is sent to your system tray, and when it is clicked it opens your main activity, passing the data (what would have been remoteMessage.getData() in onMessageReceived()) to your activity as intent extras. You can handle the extras in your main activity like so and decide what to do with them, for instance check for a key value and launch a related intent.

    // [START handle_data_extras]
    if (getIntent().getExtras() != null) {
        for (String key : getIntent().getExtras().keySet()) {
            Object value = getIntent().getExtras().get(key);
            Log.d(TAG, "Key: " + key + " Value: " + value);
        }
    }

2. You can decide what intent to open on-click if you add an intent-filter in your app manifest and a designated "click_action" value in your notification, and then handle the intent extras in the designated activity. See https://stackoverflow.com/a/39665485/3746204

I'd also suggest checking the firebase messaging sample app for ideas: https://github.com/firebase/quickstart-android/tree/master/messaging