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→Creating Checkable Item Groups
In addition to configuring independent menu items, it is also possible to create groups of menu items. This is of particular use when creating checkable menu items whereby only one out of a number of choices can be selected at any one time. Menu items can be assigned to a group by wrapping them in the <group> tag. The group is declared as checkable using the android:checkableBehavior property, setting the value to either single, all or none. The following XML declares that two menu items make up a group wherein only one item may be selected at any given time:
<pre>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">