/**     * 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        }    }