PopupWindow-----点击弹出 PopupWindow 初始化菜单

    /**
     * 点击弹出 PopupWindow  初始化菜单
     */
    private void initPopupWindow() {
        PopupWindowAdapter adapter = new PopupWindowAdapter();
        mlistView.setAdapter(adapter);     //mlistView  是mPopView 中的listview

         // 初始化popwindow , 载入布局文件
        if (mPopupWindow == null) {
            // mPopView   view对象xml文件 ,载入到popwindow
             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
        }
    }