Android PopupWindow 部分机型（魅族）点击外部不能取消的bug

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解决办法：
在showAs之前设置setBackgroundDrawable(new BitmapDrawable());

完整代码：

LayoutInflater inflater = (LayoutInflater) mContext
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final ShadowLayout layout = (ShadowLayout) inflater.inflate(R.layout.popup_notes, null);
        optionsPopWindow = new PopupWindow(layout, FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT, true);
        optionsPopWindow.setContentView(layout);
        optionsPopWindow.setBackgroundDrawable(new BitmapDrawable());
        optionsPopWindow.showAsDropDown(view);
        layout.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);