android 更改当前界面亮度

   http://bbs.youkuaiyun.com/topics/390076565

 /**

         * 设置亮度
         * 
         * @param activity
         * @param brightness
         */
        public static void setBrightness(Activity activity, int brightness) {
            WindowManager.LayoutParams lp = activity.getWindow().getAttributes();
            lp.screenBrightness = Float.valueOf(brightness) * (1f / 255f);
            activity.getWindow().setAttributes(lp);

        }

ps:

http://daikainan.iteye.com/blog/1455323  (未验证)