Popwindow在7.0系统上显示全屏

重写popwindow方法

    @Override    public void showAsDropDown(View anchor) {        if(Build.VERSION.SDK_INT == 24) {            Rect rect = new Rect();            anchor.getGlobalVisibleRect(rect);            int h = anchor.getResources().getDisplayMetrics().heightPixels - rect.bottom;            setHeight(h);        }        super.showAsDropDown(anchor);    }