我无法设置子菜单项作为托运 [英] I am unable to set a submenu item as checked

问题描述

我使用的是NavigationView我的抽屉里。这是定义所有的菜单项的抽屉menus.xml文件：

I am using a NavigationView for my drawer. This is the menus.xml file which defines all the menu items for the drawer:

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:checkableBehavior="single">
        <item
            android:id="@+id/item_1"
            android:title="Item 1"
            android:checked="true" />
        <item
            android:id="@+id/item_2"
            android:title="Item 2" />
        <item
            android:id="@+id/item_3"
            android:title="Item 3" />
        <item
            android:id="@+id/item_4"
            android:title="Item 4" />
        <item android:title="List 1">
            <menu>
                <item
                    android:id="@+id/subitem_1"
                    android:title="SubItem 1" />
                <item
                    android:id="@+id/subitem_2"
                    android:title="SubItem 2" />
            </menu>
        </item>
        <item android:title="List 2">
            <menu>
                <item
                    android:id="@+id/subitem_3"
                    android:title="SubItem 3" />
                <item
                    android:id="@+id/subitem_4"
                    android:title="SubItem 4" />
            </menu>
        </item>
    </group>
</menu>

事情是，当我打电话setChecked（真）的子菜单项，它不会高​​亮显示。

Thing is when I call setChecked(true) on the sub menu items it doesn't get highlighted.

所以，如果我强迫属性机器人：可检查=真的子菜单项，需要两次点击将它突出。此外，你可以看到第1项高亮显示，checkableBehaviour被设置为单。在这种情况下，子菜单和第一项保持高亮显示。为什么子菜单没有得到上运行setChecked高亮（真）？

So if I force the attribute android:checkable="true" on the sub-menu items, it takes two clicks to have it highlighted. Also, as you can see Item 1 is highlighted and the checkableBehaviour is set to single. In this case, the sub menu and the first item remain highlighted. Why is the sub menu not getting highlighted on running setChecked(true)?

推荐答案

有关子应加入本集团安卓checkableBehavior =单

你的XML应该是这样的：

Your xml should be something like this:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
    <item
        android:id="@+id/item_1"
        android:checked="true"
        android:title="Item 1" />
    <item
        android:id="@+id/item_2"
        android:title="Item 2" />
    <item
        android:id="@+id/item_3"
        android:title="Item 3" />
    <item
        android:id="@+id/item_4"
        android:title="Item 4" />
    <item android:title="List 1">
        <menu>
            <group android:checkableBehavior="single">
                <item
                    android:id="@+id/subitem_1"
                    android:title="SubItem 1" />
                <item
                    android:id="@+id/subitem_2"
                    android:title="SubItem 2" />
            </group>
        </menu>
    </item>
    <item android:title="List 2">
        <menu>
            <group android:checkableBehavior="single">
                <item
                    android:id="@+id/subitem_3"
                    android:title="SubItem 3" />
                <item
                    android:id="@+id/subitem_4"
                    android:title="SubItem 4" />
            </group>
        </menu>
    </item>
</group>

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