以编程方式为从 XML 创建的现有菜单创建子菜单 [英] Create submenus programmatically for existing Menu created from XML

问题描述

我已经在 xml 中创建了我的父菜单，现在我不知道如何使用代码在这些父菜单下创建子菜单.这意味着，父菜单在 menu.xml 中编码，子菜单将在数据可用时根据动态代码加载.

I have created my parent menus in xml , now i don't know how to create submenus under those parents using code. That means , parents are coded in menu.xml and submenus will be loaded based on a dynamic code as and when the data is available.

当我尝试使用 menu.addSubMenu 时，它正在创建一个新的父菜单项.

When i tried to use menu.addSubMenu it is creating a new parent menu item.

推荐答案

mymenu.xml:

mymenu.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
            android:id="@+id/menubutton_submenuButton"
            android:showAsAction="always"/>
        <menu>
            <!-- empty submenu, filled programatically -->
        </menu>
    </item>
</menu>

然后在代码中:

@Override
public boolean onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.mymenu, menu);

    MenuItem menuItem = menu.findItem(R.id.menubutton_submenuButton);
    SubMenu subMenu = menuItem.getSubMenu();
    // @todo: add submenu items programmatically here.

    return super.onCreateOptionsMenu(menu, inflater);
}

这篇关于以编程方式为从 XML 创建的现有菜单创建子菜单的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！