/**

     * 获取当前屏幕亮度

     */

    fun getBrightness():Int {

        val lp = scanForActivity(context)?.window?.attributes

        if(lp != null){

            //screenBrightness 默认为-1

            if(lp.screenBrightness < 0) return 0

            return (lp.screenBrightness * 255).toInt()

        }

        return 0

    }

    /**

     * 设置屏幕亮度

     * @param brightness 取值范围 0-255

     */

    fun setBrightness(brightness:Int){

        val lp = scanForActivity(context)?.window?.attributes

        if(lp != null){

            lp.screenBrightness = brightness.toFloat() / 255

            ChaoUtil.scanForActivity(context)?.window?.attributes = lp

        }

    }