title: Addline of NotificationCompat.InboxStyle is not working
body: <p>I am trying to make a chat application where my user will get notifications. The volume of notifications are so high, if I will make one entry for each notifications then it will fill up all the places, so I thought of applying BigTextView notifications or Stack of notifications.</p>
  
  <p>I wrote below piece of code:</p>
  
  <pre><code>NotificationManager notificationManager = (NotificationManager)
          this.getSystemService(Context.NOTIFICATION_SERVICE);
  if(listMessage.size() &lt;= 5)
  listMessage.add(messagetype + ":" + msg);
  else
  {
       listMessage.remove(4);
       listMessage.add(messagetype + ":" + msg);
  }
  Intent notificationIntent = new Intent(this, GcmActivity.class);
  notificationIntent.putExtra("title", messagetype);
  notificationIntent.putExtra("message", msg);
  PendingIntent intent = PendingIntent.getActivity(this, 0,notificationIntent, 0);
  notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
          | Intent.FLAG_ACTIVITY_SINGLE_TOP);
      NotificationCompat.Builder mBuilder;
          mBuilder =
                  new NotificationCompat.Builder(this)
                          .setSmallIcon(R.drawable.ic_launcher)
                          .setContentTitle("My MESSENGER")
                          .setStyle(new NotificationCompat.BigTextStyle()
                                  .bigText("MESSAGES"))
                          .setContentText(msg)
                          .setAutoCancel(true)
                          .setLights(Color.WHITE, 1000, 5000)
                          .setDefaults(Notification.DEFAULT_VIBRATE |
                                  Notification.DEFAULT_SOUND | Notification.DEFAULT_LIGHTS)
                          .setContentIntent(intent);
  
          NotificationCompat.InboxStyle inboxStyle =
                  new NotificationCompat.InboxStyle();
  
          inboxStyle.setBigContentTitle("MESSAGES");
          for(int j= 0;j &lt; listMessage.size();j++)
          {
  
              inboxStyle.addLine(listMessage.get(j));
          }
  
          mBuilder.setStyle(inboxStyle);
          notificationManager.notify(0, mBuilder.build());
  </code></pre>
  
  <p>This seems not to add lines in the notification. it just shows the <strong>setContentText</strong> and it shows nothing.</p>