I created a new fragment to store our news items. It's called NewsItemFragment.java. When I went to add a constructor to

public class MainActivity extends AppCompatActivity implements NewsFragment.NewsListener { 
  // New tags for referring to fragments 
    public static final String NEWS_FRAGMENT = "news_fragment"; 
    public static final String NEWSITEM_FRAGMENT = "newsitem_fragment";

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

    FragmentManager fragmentManager = getFragmentManager();

    NewsFragment savedFragment = (NewsFragment) getSupportFragmentManager().findFragmentByTag(NEWS_FRAGMENT);

    if (savedFragment == null) {
        NewsFragment newsFragment = new NewsFragment();

        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.placeholder, newsFragment);
        fragmentTransaction.commit();
    }

}

  @Override
  public void onNewsItemSelected(int index) {
    NewsItemFragment fragment = new NewsItemFragment();
    Bundle bundle = new Bundle ();
    bundle.putInt(NewsItemFragment.KEY_NEWS_ITEM_INDEX,index);
    fragment.setArguments(bundle);

    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.replace(R.id.placeholder, fragment,NEWSITEM_FRAGMENT);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
  }
}

public class NewsItemFragment extends Fragment {
    public static final String KEY_NEWS_ITEM_INDEX = "news_item_index";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // TODO:  Hmmm, how do we get this index?
        int index = 0;
        getActivity().setTitle(News.headlines[index]);
        View view = inflater.inflate(R.layout.fragment_newsitem, container, false);
        return view;
    }




    @Override
    public void onStop() {
        super.onStop();
        getActivity().setTitle(getResources().getString(R.string.app_name));
    }
}

public class News {
    public static String[] headlines = new String[]{
      "Treehouse student develops #1 App in Google App Store",
      "Oracle and Google decide to hug it out",
      "Java8 coming to Android!  Is it too late?"
    };
}