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();
    // TODO: how do we pass arguments to the new Fragment?
     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();


}

}

//news Item

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 = getArguments().getInt( NewsItemFragment.KEY_NEWS_ITEM_INDEX);
    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));
}

}

//news 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?" }; }