@Override
  protected void onDestroy() {
    LogManager.d(TAG, "onDestroy()");
    super.onDestroy();

    mFindBeacons.closeSearcher();
    loghelper.stop();
  }
  /** 停止查找beacons */
  public void onMonitoringStop(View view) {
    logToDisplay("onMonitoringStop(),stopMonitoringBeaconsInRegion");
    LogManager.d(TAG, "onMonitoringStop(),stopMonitoringBeaconsInRegion");
    mFindBeacons.closeSearcher();
    mStart_btn.setEnabled(true);
    mStop_btn.setEnabled(false);

    // 设置记录标志
    isRecorded = true;
  }