Dialog 用代码来实现全屏

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实现代码如下

Window window = getWindow();
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        if (window != null) {
            window.getDecorView().setPadding(0, 0, 0, 0);
            //很重要         window.setBackgroundDrawableResource(android.R.color.transparent);
            WindowManager.LayoutParams params = window.getAttributes();
            params.width = ViewGroup.LayoutParams.MATCH_PARENT;
            params.height = ViewGroup.LayoutParams.MATCH_PARENT;
            window.setAttributes(params);
        }