title: Custom selectableItemBackground
body: <p>I'm using a RecyclerView for a list. I've a found a really nice solution to give the list click feedback and ripple (on Lollipop).
  Basically I'm giving my row layout the attribute:</p>
  
  <pre><code>android:background="?android:attr/selectableItemBackground"
  </code></pre>
  
  <p>And everything is fine, except that I need a different background color for my list (default state). How can I override just the basic state background (not clicked) giving it a different color?</p>