Android的添加子菜单到菜单项，哪里是addSubMenu（）？ [英] Android adding a submenu to a menuItem, where is addSubMenu()?

问题描述

我想添加一个子菜单我OptionsMenu一个菜单项里面，根据我的参数编程。我在Android SDK中选中菜单项并没有addSubMenu（）方法！虽然你可以找到hasSubMenu（）和getSubMenu。

I want to add a submenu inside my OptionsMenu to a menuItem, programatically according to my parameters. I've checked "MenuItem" in android sdk and there is no addSubMenu() method!, although you can find "hasSubMenu()" and "getSubMenu".

正想着在onCreateOptionsMenu这样做的：

Was thinking on doing this in onCreateOptionsMenu:

public boolean onCreateOptionsMenu(Menu menu) {

    MenuItem mi = menu.getItem(MYITEMID);  // << this is defined in my XML optionsMenu
    SubMenu subm = mi.addSubMenu(0,1,0,"Map 1"); // no addSubMenu() method!!!???
....

如何创建在code一个菜单项内的子菜单？

How do I create a submenu inside a menuitem in code?

推荐答案

有时候Android的怪事真是太神奇了（和有趣的..）。我解决了这种方式：

Sometimes Android weirdness is really amazing (and amusing..). I solved it this way:

一）在XML中定义一个子占位符是这样的：

a) Define in XML a submenu placeholder like this:

<item android:visible="true" android:id="@+id/m_area"
   android:titleCondensed="Areas"
   android:title="Areas"
   android:icon="@drawable/restaur"
   android:enabled="true"> 
   <menu>
    <item android:id="@+id/item1" android:title="Placeholder"></item>
   </menu>
</item>

二）获取子菜单项OnCreateOptionsMenu，将其清除，并添加我的子菜单项，像这样的：

b) Get sub menu item in OnCreateOptionsMenu, clear it and add my submenu items, like this:

    public boolean onCreateOptionsMenu(Menu menu) { 
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.mapoptions, menu);

            int idx=0;
            subm = menu.getItem(MYITEM_INDEX).getSubMenu(); // get my MenuItem with placeholder submenu
            subm.clear(); // delete place holder

            while(true)
            {
                anarea = m_areas.GetArea(idx); // get a new area, return null if no more areas
                if(anarea == null)
                    break;
                subm.add(0, SUBAREASID+idx, idx, anarea.GetName()); // id is idx+ my constant
                ++idx;
            }
}

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