title: Fully transparent ActionBarSherlock by using theme
body: <p>I am using <a href="http://actionbarsherlock.com/" rel="nofollow noreferrer">ActionBarSherlock</a> 4.0.2.</p>
  
  <p>I need a fully transparent action bar (without the neon color bottom divider). Hence, I have the following style:</p>
  
  <pre><code>&lt;style name="AppTheme" parent="@style/Theme.Sherlock"&gt;
      &lt;item name="windowActionBarOverlay"&gt;true&lt;/item&gt;
      &lt;item name="icon"&gt;@drawable/ic_home&lt;/item&gt;
      &lt;item name="titleTextStyle"&gt;@style/ActionBarCompatTitle&lt;/item&gt;
      &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>By using above code, I will still have the following effect.</p>
  
  <p><img src="https://i.stack.imgur.com/Qu17C.png" alt="SherlockFragmentActivity wit divider and with half-transparent background"></p>
  
  <p>In order to disable the background, I put the following code in <code>SherlockFragmentActivity#onCreate</code>. Then the problem gone.</p>
  
  <pre><code>getSupportActionBar().setBackgroundDrawable(null);
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/i4yXs.png" alt="SherlockFragmentActivity without divider and with transparent background"></p>
  
  <p>However, I would like to see the solution being implemented in <em>styles.xml</em> instead of Java code, as I have many other devices with different screen configuration. I modified the <em>styles.xml</em> to the following, without using the previously mentioned fix in the Java code.</p>
  
  <pre><code>&lt;style name="AppTheme" parent="@style/Theme.Sherlock"&gt;
      &lt;item name="windowActionBarOverlay"&gt;true&lt;/item&gt;
      &lt;item name="icon"&gt;@drawable/ic_home&lt;/item&gt;
      &lt;item name="titleTextStyle"&gt;@style/ActionBarCompatTitle&lt;/item&gt;
      &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
  
      &lt;item name="android:background"&gt;@drawable/transparent&lt;/item&gt;
      &lt;item name="background"&gt;@drawable/transparent&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>However, the neon divider still visible. It seems that my fix using <code>android:background</code> and <code>background</code> does not work. Am I missing something?</p>