FirebaseMessagingService.java

public class FirebaseCloudMessagingService extends FirebaseMessagingService {

    public String TAG = "FIREBASE MESSAGING";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

        Log.d(TAG, "From: " + remoteMessage.getFrom());

        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());

            startActivity(new Intent(this, NotifikasiActivity.class));

        }

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {                        
            
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
        }

    } 

    @Override
    public void onNewToken(String s) {
        super.onNewToken(s);
    }
}