HarmonyOS 如何控制屏幕亮度

应用中视频播放器如何控制系统亮度

按照HarmonyOS 的文档，亮度不维护了，但是这个api调了也没反应

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-system-brightness-V5

brightness.getValue({
  success: (data: BrightnessResponse) => {
    Logger.info(TAG, 'success get brightness value:' + data.value);
    if (volume === VolumeType.UP) {
      this.bright = data.value + 1;
    } else {
      this.bright = data.value -1;
    }
    brightness.setValue({
      value: this.bright,
      success: () => {
        Logger.info(TAG, 'handling set brightness success. value:' + this.bright);
      },
      fail: (data: string, code: number) => {
        Logger.info(TAG, 'handling set brightness value fail, code:' + code + ', data: ' + data);
      }
    });
  },
  fail: (data: string, code: number) => {
    Logger.info(TAG, 'get brightness fail, code: ' + code + ', data: ' + data);
  }
});

每次设置后给了成功回调，但是在获取亮度值还是设置之前的。

https://developer.huawei.com/consumer/cn/doc/harmonyos-faqs-V5/faqs-arkui-132-V5

这个FAQ文档中说可以设置屏幕亮度，但如何获取呢