/**
     * 点击弹出 PopupWindow  初始化菜单   
     */
    private void initPopupWindow() {
        PopupWindowAdapter adapter = new PopupWindowAdapter();
        mPopDisplay.setAdapter(adapter);     //mPopDisplay 是mPopView 中的listview
        if (mPopupWindow == null) {
            // mPopView   view对象xml文件
             mPopupWindow = new PopupWindow(mPopView, mTopLayout.getWidth(),  //mTopLayout控件的宽   ,mPopView是一个xml
                    LayoutParams.WRAP_CONTENT, true);
            mPopupWindow.setBackgroundDrawable(new BitmapDrawable());
        }
        if (mPopupWindow.isShowing()) {   //开的时候 , 就关闭
            mPopupWindow.dismiss();
        } else {
            mPopupWindow.showAsDropDown(mTopLayout, 0, -10);     //    设置  ,mTopLayout的下面
        }
    }