在ActionBar中的菜单项上添加复选框

Question

我的操作栏中出现问题。我试图在ActionBar中的菜单项上添加一个复选框，但它不起作用。它只显示复选框的标题。

这是我的menu.xml：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.tracking.bus.maps.SingleViewMapsActivity" >

        <item
        android:id="@+id/actionbar_alarm"
        android:title="@string/actionbar_alarm"
        app:actionViewClass="android.widget.checkbox"
        app:showAsAction="ifRoom"/>
</menu>

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Checkable items appear only in submenus or context menus. -->

    <!-- Carefully look at the attribute name checkableBehavior on groups, but
         the attribute name checkable on items. The checkableBehavior encompasses
         the number of items that will be checkable within that group. -->

    <item android:title="None">
        <menu>
            <!-- The none checkableBehavior is default, but we explicitly show it here. -->
            <group
                android:id="@+id/noncheckable_group"
                android:checkableBehavior="none">
                <!-- Notice how these items inherit from the group. -->
                <item
                    android:id="@+id/noncheckable_item_1"
                    android:title="@string/item_1" />
                <item
                    android:id="@+id/noncheckable_item_2"
                    android:title="@string/item_2" />
                <item
                    android:id="@+id/noncheckable_item_3"
                    android:title="@string/item_3" />
            </group>
        </menu>
    </item>

    <item android:title="All">
        <menu>
            <group
                android:id="@+id/checkable_group"
                android:checkableBehavior="all">
                <!-- Notice how these items inherit from the group. -->
                <item
                    android:id="@+id/checkable_item_1"
                    android:title="@string/item_1" />
                <item
                    android:id="@+id/checkable_item_2"
                    android:checked="true"
                    android:title="@string/item_2" />
                <item
                    android:id="@+id/checkable_item_3"
                    android:checked="true"
                    android:title="@string/item_3" />
            </group>
        </menu>
    </item>

    <item android:title="Single">
        <menu>
            <group
                android:id="@+id/exclusive_checkable_group"
                android:checkableBehavior="single">
                <!-- Notice how these items inherit from the group. -->
                <item
                    android:id="@+id/exclusive_checkable_item_1"
                    android:title="@string/item_1" />
                <item
                    android:id="@+id/exclusive_checkable_item_2"
                    android:title="@string/item_2" />
                <item
                    android:id="@+id/exclusive_checkable_item_3"
                    android:checked="true"
                    android:title="@string/item_3" />
            </group>
        </menu>
    </item>

    <item android:title="All without group">
        <menu>
            <!-- Notice how these items have each set. -->
            <item
                android:id="@+id/nongroup_checkable_item_1"
                android:checkable="true"
                android:title="@string/item_1" />
            <item
                android:id="@+id/nongroup_checkable_item_2"
                android:checkable="true"
                android:checked="true"
                android:title="@string/item_2" />
            <item
                android:id="@+id/nongroup_checkable_item_3"
                android:checkable="true"
                android:checked="true"
                android:title="@string/item_3" />
        </menu>
    </item>

</menu>

Answer 2

您必须使用以下属性（取决于项目）：

对于复选框：android:checkableBehavior="all"

对于单选按钮：android:checkableBehavior="single"