popupwindow设置全屏边缘仍然有缝隙

bug如图：

边缘仍然有缝隙   具体原因不清楚  暂时记录一下解决办法：设置背景

setBackgroundDrawable(new BitmapDrawable());

效果图：

整个popupwindow设置为全屏，然后添加了一个铺满的viewgroup  再加入固定大小的view

最后贴上核心代码：

this.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
this.setHeight(ViewGroup.LayoutParams.MATCH_PARENT);
this.setBackgroundDrawable(new BitmapDrawable());// 这样设置才能铺满屏幕，去掉这句话会出现缝隙
this.setOutsideTouchable(true);
this.setFocusable(true);
RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
      ViewGroup.LayoutParams.MATCH_PARENT);
RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(CommonUtil.dp2px(context, 844), CommonUtil.dp2px(context, 527));

RelativeLayout root = new RelativeLayout(context);
root.setLayoutParams(params1);
root.setBackgroundColor(Color.parseColor("#99000000"));
RootView rootView = new RootView(context);
rootView.setLayoutParams(params2);
params2.addRule(RelativeLayout.CENTER_IN_PARENT);
root.addView(rootView);

this.setContentView(root);

记录贴！