You can actually put anything inside a toolbar. See the below code.
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:background="@color/colorPrimary">
</android.support.v7.widget.Toolbar>
Between the above toolbar tag you can put almost anything. That is the benefit of using a Toolbar.
Source: Android Toolbar Example