Android сохраняет выбранный элемент из фрагмента списка при изменении экрана (пейзаж)

Я новичок в Fragments и играю с ним. В основном я хочу макет мастер/деталь. Моя главная панель — это список песен, а детали — текст каждой песни.

Итак, вот что у меня есть:

MainActivity.class:

public class MainActivity extends FragmentActivity implements TitlesFragment.OnItemSelectListener{

// Whether or not we are in dual-pane mode
boolean mIsDualPane = false;

int mArtIndex = 0;

TitlesFragment mTitleFragment;
DescriptionFragment descriptionFragment;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mTitleFragment = (TitlesFragment) getSupportFragmentManager().findFragmentById(
            R.id.titlesFragment);

    descriptionFragment = 
            (DescriptionFragment) getSupportFragmentManager().findFragmentById(R.id.descriptionFragment);

    View descriptionView = findViewById(R.id.descriptionFragment);
    mIsDualPane = descriptionView != null && descriptionView.getVisibility() == View.VISIBLE;

    Log.e("", "" + mIsDualPane);


    mTitleFragment.setSelection(0);
    if(mIsDualPane) {
        String description = Songs.lyrics[mArtIndex].toString();
        descriptionFragment.setDescriptionIntoFragment(description);
    }
    restoreSelection(savedInstanceState);

}

@Override
protected void onStart() {
    super.onStart();

}

/*
 * Implements the interface declared into TitlesFragment class
 * If the screen is in portrait mode launch a second activity instead of 
 * showing the text into the second fragment (as the second fragment is not visible)
 */
@Override
public void onItemSelect(int index) {
    String description = Songs.lyrics[index].toString();
    if(descriptionFragment != null && descriptionFragment.isInLayout())
    {
        descriptionFragment.setDescriptionIntoFragment(description);
    }
    else
    {
        Intent intent = new Intent(this, DescriptionActivity.class);
        intent.putExtra("lyrics", description);
        startActivity(intent);
    }
}

/** Restore category/article selection from saved state. */
void restoreSelection(Bundle savedInstanceState) {
    if (savedInstanceState != null) {
        if (mIsDualPane) {

            int artIndex = savedInstanceState.getInt("artIndex", 0);
            String description = Songs.lyrics[artIndex].toString();
            mTitleFragment.setSelection(artIndex);
            descriptionFragment.setDescriptionIntoFragment(description);
        }
    }
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    restoreSelection(savedInstanceState);
}

/** Save instance state. Saves current category/article index. */
@Override
protected void onSaveInstanceState(Bundle outState) {
    outState.putInt("artIndex", mArtIndex);
    super.onSaveInstanceState(outState);
}

TitlesFragment.class:

public class TitlesFragment extends ListFragment {

private OnItemSelectListener itemSelectListener;

//public interface used to communicate with activities
public interface OnItemSelectListener
{
    public void onItemSelect(int index);
}

//Check if the parent activity has implemented the public interface
//if not, throw an exception
@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try
    {
        itemSelectListener = (OnItemSelectListener) activity;
    }
    catch(ClassCastException e)
    {
        throw new ClassCastException(activity.toString() + " must implement OnItemSelectListener");
    }
}


//launch the method described into the interface when the user click on an item
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    itemSelectListener.onItemSelect(position);
}


@SuppressLint("InlinedApi")
@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    int layout = 0;
    /*
     * Pick a different layout for the list item based on the sdk version,
     * as the simple_list_item_activated_1 is not compatible on devices
     * running sdk < 11 and could throw a fatal exception
     */
    if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.HONEYCOMB)
    {
        layout = android.R.layout.simple_list_item_1;
    }
        else layout = android.R.layout.simple_list_item_activated_1;
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), layout, Songs.titles);
    setListAdapter(adapter);
    getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    adapter.notifyDataSetChanged();
}

DescriptionActivity.class:

public class DescriptionActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE)
    {
        finish();
        return;
    }
    else setContentView(R.layout.activity_description);

    Bundle extras = getIntent().getExtras();

    if(extras != null)
    {
        String lyrics = extras.getString("lyrics");
        DescriptionFragment descriptionFragment = 
                (DescriptionFragment) getSupportFragmentManager().findFragmentById(R.id.descriptionFragment);
        if(descriptionFragment != null && descriptionFragment.isInLayout())
        {
            descriptionFragment.setDescriptionIntoFragment(lyrics);
        }
    }
}

Проблема в том, что когда я выбрал 3-й элемент из списка в портретном режиме и перешел в альбомный режим, детализация неверна, он выбрал первую (0) деталь. Что не так с моим кодом? Любые идеи? Буду рад вашей помощи. Спасибо.