我这样打开上下文菜单:privateOnClickListeneroptionsClickListener=newOnClickListener(){publicvoidonClick(Viewv){registerForContextMenu(v);openContextMenu(v);}};怎么调用registerForContextMenu(v);openContextMenu(v);在我的常规菜单处理程序中:publicbooleanonOptionsItemSelected(MenuItemitem){switch(item.getItemId()){caseOPTIONS: