WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.alpha = 0.6f; //值越大越透明,即不暗
getWindow().setAttributes(lp);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
Android 弹出对话框使底部背景变暗
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转载自www.cnblogs.com/xuyj/p/9052966.html
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