code: public void addAction(int icon, CharSequence title, Action.OnActionListener listener) {
          addAction(icon, title, listener, null, null, null, null);
      }
docs: Add a action to this notification. Actions are typically displayed as a
  button adjacent to the notification content.
  
  @see android.app.Notification#addAction
  
  @param icon
  @param title
  @param listener