android firebase notifications works not

Question

I set up the Firebase messaging with my app, but unfortunately the notifications are not coming.

I set up Firebase properly, it is connected to my app, I also sent some test messages, in the Firebase it says completed, however I did not receive them on my phone.

My app is not in the store yet, I am developing and testing it via Android studio.

Here is my MyFirebaseInstanceIDService class

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {

private static final String TAG = "MyFirebaseIIDService";

/**
 * Called if InstanceID token is updated. This may occur if the security of
 * the previous token had been compromised. Note that this is called when the InstanceID token
 * is initially generated so this is where you would retrieve the token.
 */
// [START refresh_token]
@Override
public void onTokenRefresh() {
    // Get updated InstanceID token.
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();
    Log.d(TAG, "Refreshed token: " + refreshedToken);


    // TODO: Implement this method to send any registration to your app's servers.
    sendRegistrationToServer(refreshedToken);
}
// [END refresh_token]

/**
 * Persist token to third-party servers.
 *
 * Modify this method to associate the user's FCM InstanceID token with any server-side account
 * maintained by your application.
 *
 * @param token The new token.
 */
private void sendRegistrationToServer(String token) {
    // Add custom implementation, as needed.
}

}

and here comes the MyFirebaseMessagingService class:

public class MyFirebaseMessagingService extends FirebaseMessagingService { private static final String TAG = "MyFirebaseMsgService";

/**
 * Called when message is received.
 *
 * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
 */
// [START receive_message]
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    // [START_EXCLUDE]
    // There are two types of messages data messages and notification messages. Data messages are handled
    // here in onMessageReceived whether the app is in the foreground or background. Data messages are the type
    // traditionally used with GCM. Notification messages are only received here in onMessageReceived when the app
    // is in the foreground. When the app is in the background an automatically generated notification is displayed.
    // When the user taps on the notification they are returned to the app. Messages containing both notification
    // and data payloads are treated as notification messages. The Firebase console always sends notification
    // messages. For more see: https://firebase.google.com/docs/cloud-messaging/concept-options
    // [END_EXCLUDE]


    //"Title","Message","NotyType",   "hotelStatus"

    String title = "";
    if (remoteMessage.getNotification().getTitle() != null){
        title = remoteMessage.getNotification().getTitle();
    }

    String message = "";
    if (remoteMessage.getNotification().getBody() != null){
        message = remoteMessage.getNotification().getBody();
    }

    Log.e("notification","recieved");


    sendNotification(title, message);
    // Also if you intend on generating your own notifications as a result of a received FCM
    // message, here is where that should be initiated. See sendNotification method below.
}
// [END receive_message]


private void sendNotification(String title, String body) {
    Intent i = new Intent(this, MainActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pi = PendingIntent.getActivity(this,
            0 /* Request code */,
            i,
            PendingIntent.FLAG_ONE_SHOT);

    Uri sound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this,
            getString(R.string.default_notification_channel_id))
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(title)
            .setContentText(body)
            .setAutoCancel(true)
            .setSound(sound)
            .setContentIntent(pi);

    NotificationManager manager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    assert manager != null;
    manager.notify(0, builder.build());
} }

I don't see any logs when debugging, also don't receive any notifications on the phone.

Am I doing something wrong here? Can you please advice? Thanks.

Answer 1

OH now I tried something! I updated my MyFirebaseMessagingService class as you see in my question now, and now it WORKS! From Firebase console I sent only message, no data, and all the notifications I received in my device! Even if my app is running, even if I closed it! Every notification I received. When the app was running, the notification has my custom icon, and when the app is closed, the default "bell" icon is there, but in both cases I received the notifications! Not sure how it is possible, but it works.

Answer 2

onMessageReceived does not get called with a push sent with just notification tag and your app isn't in foreground. If it is indeed in foreground, your onMessageReceived will get called.

If you want your onMessageReceived to get triggered, you will need to send the push with an additional data tag or just the data tag.

However note, if you send both notification and data tags, your onMessageReceived will only get triggered if your app is in foreground, If it's in background, everything inside the data tag will be passed inside an click intent as extras

Only a Data tag will always call onMessageReceived regardless of whether you app is in foreground or not.

Eg: for just a data tag :)

https://fcm.googleapis.com/fcm/send
Content-Type:application/json
Authorization:key=AIzaSyZ-1u...0GBYzPu7Udno5aA

{ "data": {
    "score": "5x1",
    "time": "15:10"
  },
  "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
}