title: Firebase(FCM) notifications not coming when android app removed from recent tray
body: <p>I'm sending Firebase notifications through my own webservice with PHP like below.</p>
  
  <pre><code>$url = 'https://fcm.googleapis.com/fcm/send';
          $fields = array(
               'registration_ids' =&gt; $tokens,
               'data' =&gt; $message
              );
          $headers = array(
              'Authorization:key = SERVER_KEY ',
              'Content-Type: application/json'
              );
  </code></pre>
  
  <p>1.Notifications are coming when App is in Foreground and Background without any issues , But if I removed app from recent tray then notifications not coming , I must have to handle this any solution for this ?  (like Whatsup notifications are showing all scenarios even I force stopped this app from settings)</p>
  
  <p>2.Once I received notification , from "onMessageReceived"  how to pass these message,body content to my Activity /Fragments?</p>
  
  <p>3.In some cases I want to send notification to all , Instead of adding all tokens to array . any other way to handle like "send to ALL" something like that ?</p>
  
  <pre><code>public class MyFirebaseMessagingService extends FirebaseMessagingService {
      private static final String TAG = "MsgService";
      @Override
      public void onMessageReceived(RemoteMessage remoteMessage) {
          Log.d(TAG, "From: " + remoteMessage.getFrom());
          Log.d(TAG, "Data Payload : " + remoteMessage.getData());
          sendNotification(remoteMessage.getData().get("message"));
      }
      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);
          NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                  .setSmallIcon(R.mipmap.ic_launcher)
                  .setContentTitle("Firebase Push Notification")
                  .setContentText(messageBody)
                  .setAutoCancel(true)
                  .setSound(defaultSoundUri)
                  .setContentIntent(pendingIntent);
          NotificationManager notificationManager =
                  (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
          notificationManager.notify(0, notificationBuilder.build());
      }
  } 
  </code></pre>
  
  <p>Failed devices: (Notifications are <strong>not coming</strong> after removed from Recent Tray)</p>
  
  <ul>
  <li>MI Redmi Note 2 (5.0.2 Lollipop) </li>
  <li>Huawei honor 5c (5.1.1 Lollipop)</li>
  </ul>
  
  <p>Succeed devices: (Notifications are coming after removed from Recent Tray)</p>
  
  <ul>
  <li>HTC One X (4.2 Jelly Bean)</li>
  <li>Samsung galaxy grand prime (4.4 Kitkat)</li>
  </ul>