title: cardElevation not showing shadows on Lollipop
body: <p>I've checked a whole bunch of answers here, and still no dice. Android Studio preview shows the shadow, but not the 5.1.1 Nexus 7.</p>
  
  <p>Here's my 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:layout_width="match_parent"
    android:layout_height="wrap_content"
    card_view:cardCornerRadius="4dp"
    card_view:cardUseCompatPadding="true"
    card_view:cardElevation="20sp"
    card_view:cardPreventCornerOverlap="true"
    android:layout_margin="6dp"
  &gt;
  </code></pre>
  
  <p>So I've <a href="https://stackoverflow.com/questions/27599603/cardview-not-showing-shadow-in-android-l">used <code>cardUseCompatPadding</code></a> (also <a href="https://stackoverflow.com/questions/26997109/setting-elevation-in-xml-on-appcompat-cardview-on-android-5-0">here</a>), <a href="https://developer.android.com/reference/android/support/v7/widget/CardView.html#attr_android.support.v7.cardview:cardElevation" rel="nofollow noreferrer">checked the documentation</a>, made sure the card has a margin .... no dice.</p>
  
  <p>I posted the total XML file over at <a href="https://gist.github.com/tigerhawkvok/0ca3d1f402afa29642d5" rel="nofollow noreferrer">https://gist.github.com/tigerhawkvok/0ca3d1f402afa29642d5</a> .</p>
  
  <p>Help?</p>