menu_search.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:compat="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/search"
        android:icon="@drawable/abc_ic_search_api_mtrl_alpha"
        android:title="Search"
        android:visible="true"
        compat:actionViewClass="android.support.v7.widget.SearchView"
        compat:showAsAction="ifRoom|collapseActionView" />
    
</menu>