title: How Can we hide title bar while using action bar?
body: <p>I'm using ActionBarSherlock and I'm trying to hide the title bar of my application but whenever I do that, I get a <code>NullPointerException</code> when accessing the <code>ActionBar</code> How do I remove/hide the title bar? Please note that I'm not referring to the title of the action bar. I'm referring to the title bar above the action bar. I'm running my application on an Android 2.3 device.</p>
  
  <p>Below is my code: (My class extends <code>SherlockFragmentActivity</code>.)</p>
  
  <pre><code>super.onCreate(savedInstanceState);
  setTheme(R.style.Theme_Sherlock);
  this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  ActionBar actionbar = getSupportActionBar();
  actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); //I get the NullPointerException here.
  
  //...
  
  setContentView(R.layout.tab_navigation);
  </code></pre>