title: Setting Elevation in XML on AppCompat CardView on Android 5.0
body: <p>From what I understand, early in the preview stage there seemed to be no way to set elevation in XML only on <code>CardView</code>s without a hack in Java. Now that the official release is out, is there any way of doing this in XML without writing Java code to set elevation?</p>
  
  <p>I have tried <code>card_view:cardElevation</code> to no effect.  I had thought when I was using the emulators for 5.0 everything was fine. But now that I'm using the official version on my actual device all of my <code>CardView</code>s disappeared</p>
  
  <p>Pre Lollipop, it works great. </p>
  
  <p>Here is my full xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:card_view="http://schemas.android.com/apk/res-auto"
      android:orientation="horizontal"
      android:layout_width="match_parent"
      android:id="@+id/cv1"
      card_view:cardElevation="4dp"
      android:layout_margin="6dp"
      card_view:cardCornerRadius="3dp"
      android:layout_height="match_parent"&gt;
  </code></pre>