// ex1, 获取gps信息的按钮的事件
  private void getGpsinfoButtonClick(View v) {
    if (mLocationHelper == null) {
      mLocationHelper = LocationHelper.getInstance();
    }

    int intRet = mLocationHelper.init(MainActivity.this, this);
    if (intRet == Constants.ERROR_CANT_GET_GPS_SERVICE) {
      Toast.makeText(this, "请打开GPS服务!", Toast.LENGTH_LONG).show();
    } else if (intRet == Constants.ERROR_CANT_GET_GPS_INFO) {
      Log.e(TAG, "无法获得GPS数据信息!");
      return;
    }
  }