How Can we hide title bar while using action bar?

Question

I'm using ActionBarSherlock and I'm trying to hide the title bar of my application but whenever I do that, I get a NullPointerException when accessing the ActionBar 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.

Below is my code: (My class extends SherlockFragmentActivity.)

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);

Answer 1

I hide the title bar by adding the following lines of code:

getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayShowHomeEnabled(false);

hope this helps :)