code: private void addSmallIcon(RemoteViews notificationView) {
          notificationView.setInt(R.id.simple_sound_cloud_notification_icon,
                  "setBackgroundResource", mNotificationConfig.getNotificationIconBackground());
          notificationView.setImageViewResource(R.id.simple_sound_cloud_notification_icon,
                  mNotificationConfig.getNotificationIcon());
      }
docs: Add the small right icon for Lollipop device.
  
  @param notificationView remotesview used in the notification.