title: transparent Actionbar with AppCompat-v7 21
body: <p>Is there a way to make the ActionBar transparent in Material Design via Appcompat-v7 21? This is not working unfortunately. </p>
  
  <pre><code>  &lt;item name="colorPrimary"&gt;@android:color/transparent&lt;/item&gt;
  </code></pre>
  
  <p>Also not the old:</p>
  
  <pre><code>  &lt;style name="Widget.Styled.ActionBar" parent="Widget.AppCompat.Light.ActionBar"&gt;
          &lt;item name="android:background"&gt;@android:color/transparent&lt;/item&gt;
    &lt;/style&gt;
  </code></pre>