android popupWindow

<span style="font-size:18px;"> // 一个自定义的布局，作为显示的内容        View contentView = LayoutInflater.from(this).inflate(                R.layout.popup_window, null);        PopupWindow popupWindow = new PopupWindow(contentView,                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, true);        popupWindow.setTouchable(true);        popupWindow.setOutsideTouchable(true);        // 如果不设置PopupWindow的背景，无论是点击外部区域还是Back键都无法dismiss弹框        popupWindow.setBackgroundDrawable(new ColorDrawable(0));        // 设置好参数之后再show        popupWindow.showAsDropDown(view);</span>