Good Old Way: Fragment

HeadlinesFragment.java

public class HeadlinesFragment extends ListFragment {
    HeadlineListener mCallback;

  // Container Activity must implement this interface
  public interface HeadlineListener {
    public void onArticleSelected(int position);
  }

  @Override
  public void onAttach(Activity activity) {
   super.onAttach(activity);

   // Makes sure that the container activity has implemented
   // the callback interface. If not, it throws an exception
     try {
      mCallback = (HeadlineListener) activity;
     } catch (ClassCastException e) {
       throw new ClassCastException(activity.toString()
           + " must implement HeadlineListener");
     }
   }

   @Override
   public void onListItemClick(ListView l, View v, int p, long i) {
     // Send the event to the host activity
     mCallback.onArticleSelected(p);
   }
}

public class HeadlinesFragment extends ListFragment { There is a typo --> `HeadlineFragment

HeadlineListener mCallback; Hungarian notation?