code: public void setContentAction(Action act) {
          if (act.entry != null && act.entry != this) {
              Log.e(TAG, "setContentAction failed. Already applied to another notification - " +
                    act.entry.ID + ". Current notification is " + ID);
              return;
          }
          this.contentAction = act;
          this.contentAction.entry = this;
          this.contentAction.title = "ContentAction";
      }
docs: Set a action to be fired when the notification content gets clicked.
  
  @param act