public classWindowBackgroundUtils{
public static voidsetWindowBackground(Contextcontext,floatalpha){
WindowManager.LayoutParamslp=((Activity)context).getWindow().getAttributes();
lp.alpha=alpha;
((Activity)context).getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
((Activity)context).getWindow().setAttributes(lp);
}
}
在设置背景属性之前添加flag。
https://mp.weixin.qq.com/s?__biz=MzA3ODg4MDk0Ng==&mid=2651113830&idx=1&sn=7a968fa68abe54e68506a41a7831bfb5
