code: public boolean deleteTrigger(long id, String appPackageName) {
  
          boolean success = mTriggerTable.deleteTrigger(id, appPackageName);
          if (success) {
              if (mHandler != null)
                  mHandler.postRemoveTrigger(id);
          }
          return success;
      }
docs: Deletes the trigger specified by its id.
  
  @param id
  @return true if the trigger has been deleted