title: Elevation on Android Lollipop not working
body: <p>I am trying to make use of the elevation property in the latest Android Lollipop preview release. I set the targetSdk to 21 and the theme to Material. Next i added a background shape to a TextView and set the elevation to 8dp but the TextView is not showing any signs of a shadow. That is on a Nexus7 running the Lollipop preview. Is there anything else i have to consider?</p>
  
  <p>Here is the layout:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent"&gt;
  
    &lt;TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/rect"
        android:text="hallo world"
        android:padding="8dp"
        android:elevation="8dp" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>This is the background drawable:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle"&gt;
      &lt;solid android:color="#7d0073ff" /&gt;
      &lt;corners android:radius="16dp" /&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>Here is the TextView:</p>
  
  <p><img src="https://i.stack.imgur.com/Kfr0A.png" alt="Android elevation"></p>