须知少年凌云志，曾许人间第一流。这篇文章主要讲述Android?????????????????????????????????相关的知识，希望能为你提供帮助。
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WindowManager.LayoutParams lp=getWindow().getAttributes(); lp.alpha=0.3f; getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); getWindow().setAttributes(lp);
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WindowManager.LayoutParams lp=getWindow().getAttributes(); lp.alpha=1.0f; getWindow().clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND); getWindow().setAttributes(lp);
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