title: Unable to make toolbar transparent in Android
body: <p>My tool bar always stays gray when I try to set the background as transparent.
  Here is my XML.</p>
  
  <pre><code>&lt;android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@android:color/transparent"
      android:minHeight="@dimen/abc_action_bar_default_height_material"
      app:theme="@style/Rushmore.Toolbar.Transparent" /&gt;
  </code></pre>
  
  <p>And my theme </p>
  
  <pre><code> &lt;style name="Rushmore.Toolbar.Transparent" parent="@style/ThemeOverlay.AppCompat.Dark.ActionBar"&gt;
          &lt;item name="android:windowActionBarOverlay"&gt;true&lt;/item&gt;
  
          &lt;!-- Support Library compability --&gt;
          &lt;item name="windowActionBarOverlay"&gt;true&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>
  
  <p>I have tried it from code </p>
  
  <pre><code>Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
          toolbar.setBackgroundResource(Color.TRANSPARENT);
  </code></pre>
  
  <p>I am not sure what is it I am missing...</p>