This answer maybe too late, but here is how I do it. Styling the toolbar will do the trick. Create toolbar.xml with following code.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:layout_alignParentTop="true"
android:layout_gravity="bottom"
local:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
local:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
and in the styles.xml
<style name="AppBaseTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!--
-->
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
</style>
Finally, include the toolbar inside layout
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />