Android中PopupWindow响应返回键并关闭的2种方法

popupWindow = new PopupWindow(popupWindow_view, 200, 150, true);

privatePopupWindow pw;
privateView view;
privateLinearLayout layMenu;
 
LayoutInflater inflater = (LayoutInflater) main.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.popup_main_menu,null, false);
layMenu = (LinearLayout) view.findViewById(R.id.layMenu);
pw =new PopupWindow(view, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,true);
 
layMenu.setOnKeyListener(newOnKeyListener()
{
    publicboolean onKey(View v, intkeyCode, KeyEvent event)
    {
        if(event.getAction() == KeyEvent.ACTION_DOWN && keyCode == KeyEvent.KEYCODE_BACK)
            pw.dismiss();
 
        returnfalse;
    }
});