How to create ripple effect in simple layout

Question

How can I have a ripple effect in a simple linear/relative layout when touching the layout?

I've tried setting the background of a layout to something like:

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
    android:color="?android:colorControlHighlight" >

    <item android:drawable="@android:color/white"/>

</ripple>

However I'm only seeing a plain white background and no ripple effect when touching the layout. What am I doing wrong?

Edit:

For reference, here is my layout xml file:

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:background="@drawable/test"
        android:clickable="true">
    </RelativeLayout>

Answer 1

It turns out this is working as intended. The standard Material theme colorControlHighlight value is #40ffffff. So on a white background, this will not show up. Changing the highlight color to something else works, and/or changing the background color of the object.

Thanks all (especially Alanv for pointing me in the right direction).