title: How to open Action Bar when Activity is extending something different
body: <p>I am trying to set up the action bar in an Activity which extends fragment:</p>
  
  <pre><code>public class ItemDescriptionActivity extends FragmentActivity
  </code></pre>
  
  <p>and this is the fragment:</p>
  
  <pre><code>public class ImageSliderFragment extends Fragment
  </code></pre>
  
  <p>How can I set it up, I cannot extend AppCompatActivity, thanks for your help</p>