Android - 荧屏亮度

int getScreenBrightness(Activity activity) {    int value = 0;    ContentResolver cr = activity.getContentResolver();    try {        value = Settings.System.getInt(cr, Settings.System.SCREEN_BRIGHTNESS);    } catch (SettingNotFoundException e) {            }    return value;}

void setScreenBrightness(Activity activity, float value) {    WindowManager.LayoutParams params = activity.getWindow().getAttributes();    params.screenBrightness = value;    activity.getWindow().setAttributes(params);}