创建PopupWindow

 

    //创建PopupWindow对象， 参数形式（在PopupWindow中显示的组件，宽度，高度，PopupWindow是否可以获取焦点）
     PopupWindow pop = new PopupWindow(menuview, LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT, true);

     // 加上下面两行可以用back键关闭popupwindow，否则必须调用dismiss();
    pop.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

    //设置动画
    pop.setAnimationStyle(R.style.PopupAnimation);

    //点击PopupWindow的外围是否要通知PopupWindow
    pop.setOutsideTouchable(false);

    //设置PopupWindwo显示在view组件的下方，view是弹出PopupWindow的事件源
    pop.showAsDropDown(view, Gravity.CENTER_HORIZONTAL, 0);

    //PopupWindwo组件显示

    pop.update();