Push Notifications after App is killed

Question

I can't seem to receive FCM Push Notifications that I send from the FCM console after app is killed on android, as in long-press the Overview button and swiping the app to be killed. It works absolutely fine when the app is running in the foreground or background. This may seem like a duplicate question but I have tried the other methods but I still cannot seem to get it.

NotificationService.java

public class NotificationService extends FirebaseMessagingService
{

private static final String TAG = "FCM Service";
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {

    Log.d(TAG, "From: " + remoteMessage.getFrom());
    Log.d(TAG, "Notification Message Body: " + remoteMessage.getNotification().getBody());
    sendNotification(remoteMessage.getNotification().getBody());
}

private void sendNotification(String messageBody) {

        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        android.support.v4.app.NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("Firebase")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

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

        notificationManager.notify(0, notificationBuilder.build());
}
}

TokenRefresh.java

public class TokenRefresh extends FirebaseInstanceIdService {

private static final String TAG = "FirebaseIDService";

@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);
}

/**
 * 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.

}

}

MainActivity.java

public class MainActivity extends AppCompatActivity {

Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    FirebaseMessaging.getInstance().subscribeToTopic("global");

    String token = ("fcm"+ FirebaseInstanceId.getInstance().getToken());


}

}

Answer 1

I had exactly the same problem. Notifications showed just fine in foreground and background mode, but not when the app was killed. Eventually I found this: https://github.com/firebase/quickstart-android/issues/41#issuecomment-306066751

The problem is with the debugging mode in Android Studio. To correctly test your notifications do the following: Run your app via debug in Android Studio. Swipe it away to be killed. Restart the app via the launcher icon on your phone. Swipe it away again (so it gets killed).

Send your notification and now you will see it!

Hope this solved your problem.