Android Compatibility PackageでFragment

public class SandBoxActivity extends Activity {
package jp.gr.java.conf.ulexite.fragmenttest;

import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class TitlesFragment extends ListFragment {
 private int mCurCheckPosition = 0;
 private static final String[] mTitles = {"Title1", "Title2", "Title3", "Title4",
  "Title5", "Title6", "Title7", "Title8"};

   @Override
   public void onActivityCreated(Bundle savedState) {
       super.onActivityCreated(savedState);
      
       ArrayAdapter titlesArray = new ArrayAdapter(getActivity(),
         R.layout.title, mTitles);
       setListAdapter(titlesArray);
      
       if (savedState != null) {
        mCurCheckPosition = savedState.getInt("curChoice", 0);
       }
      
       getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
       showDetails(mCurCheckPosition);
   }

   @Override
   public void onSaveInstanceState(Bundle outState) {
       super.onSaveInstanceState(outState);
       outState.putInt("curChoice", mCurCheckPosition);
   }

   @Override
   public void onListItemClick(ListView l, View v, int pos, long id) {
    showDetails(pos);
   }
  
   private void showDetails(int index) {
       mCurCheckPosition = index;

       getListView().setItemChecked(index, true);
      
       // Check what fragment is shown, replace if needed.
       DetailsFragment details = (DetailsFragment)
               getFragmentManager().findFragmentById(R.id.details);
       if (details == null || details.getShownIndex() != index) {
           // Make new fragment to show this selection.
           details = DetailsFragment.newInstance(index);

           // Execute a transaction, replacing any existing
           // fragment with this one inside the frame.
           FragmentTransaction ft
                   = getFragmentManager().beginTransaction();
           ft.replace(R.id.details, details);
           ft.setTransition(
                   FragmentTransaction.TRANSIT_FRAGMENT_FADE);
           ft.commit();
       }
   }
}