//通過反射的方式去判斷wifi是否已經連接上，并且可以開始傳輸數據  private boolean checkWiFiConnectSuccess() {    Class classType = WifiInfo.class;    try {      Object invo = classType.newInstance();      Object result = invo.getClass().getMethod("getMeteredHint").invoke(invo);      return (boolean) result;    } catch (InstantiationException e) {      e.printStackTrace();      return false;    } catch (IllegalAccessException e) {      e.printStackTrace();      return false;    } catch (NoSuchMethodException e) {      e.printStackTrace();      return false;    } catch (InvocationTargetException e) {      e.printStackTrace();      return false;    }  }