src/main/res/menu/menu_main.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=".MainActivity">

	<item android:id="@+id/action_settings"
	      android:title="@string/action_settings"
	      android:orderInCategory="100"
	      android:showAsAction="ifRoom" />
	<item android:id="@+id/action_search"
	      android:title="@string/action_search"
	      android:icon="@android:drawable/ic_menu_search"
	      android:showAsAction="always"
	      android:actionViewClass="android.widget.SearchView"
	  />
</menu>