ui/actionbarcompat/SearchView/src/main/res/menu/main.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  Copyright 2013 The Android Open Source Project

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->

<!--
  As we're using ActionBarCompat, any action item attributes come from ActionBarCompat's XML
  namespace instead of the android namespace. Here we've added a new support namespace added to
  the menu element allowing us to use the 'showAsAction' attribute in a backwards compatible way.
  Any other action item attributes used should be referenced from this namespace too
  (actionProviderClass, actionViewClass, actionLayout).
-->
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:support="http://schemas.android.com/apk/res-auto">

    <!--
        Here we create an item, setting the actionViewClass attribute to point to ActionBarCompat's
        SearchView. We add the collapseActionView flag to showAsAction so that the SearchView is
        collapsed until the user clicks on the action item.
    -->
    <item
        android:id="@+id/menu_search"
        android:title="@string/menu_search"
        android:icon="@drawable/ic_action_search"
        support:actionViewClass="android.support.v7.widget.SearchView"
        support:showAsAction="ifRoom|collapseActionView"/>

</menu>