获取屏幕，改变屏幕的亮度，透明度

见到了贴上，以后用的到

WindowManager.LayoutParams lp =getWindow().getAttributes();                                                                             lp.screenBrightness=1.0f;                                                                                                        getWindow().setAttributes(lp);

范围0-1

backgroundAlpha(1.0f);

/** * 设置添加屏幕的背景透明度 * * @param bgAlpha 透明度 */public void backgroundAlpha(float bgAlpha) {    WindowManager.LayoutParams lp = getWindow().getAttributes();    lp.alpha = bgAlpha;    getWindow().setAttributes(lp);}