title: can not remove title bar in Activity
body: <p>i want to remove title on top of my Activity. i tried this two way they work but not in api level 8.</p>
  
  <p>1:  </p>
  
  <pre><code>&lt;style name="NOtitleTheme" parent="Theme.AppCompat.Light"&gt;
  &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
     &lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt; &lt;/style&gt;
  </code></pre>
  
  <p>2:      </p>
  
  <pre><code>this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  </code></pre>
  
  <p>any idea why this does not work on <code>api 8</code>?</p>
  
  <p>once i managed to remove it in <code>api 8</code>, but i do not remember how.</p>
  
  <hr>
  
  <p><strong>EDIT:</strong></p>
  
  <p><strong>Solved!</strong> the problem was     <code>this.requestWindowFeature(Window.FEATURE_NO_TITLE)</code> does not work on API 8, and also <code>&lt;item name="android:windowNoTitle"&gt;true&lt;/item&gt;</code> does not work, but   <code>actionBar.hide()</code> works , the reason that getSupportActionBar() returns null was using one of the two option before, i just forget to remove both. when i remove one i add other(what a a stupid !)
  thanks all! (sorry for bad English)</p>