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Start your free trialcraig hlatywayo
4,017 PointsI created a new fragment to store our news items. It's called NewsItemFragment.java. When I went to add a constructor to
May you please help with the whole challenge i am lost
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?" }; }
1 Answer
Rares Conea
Courses Plus Student 15,000 PointsYou forgot to set the tag inside the if statement:
fragmentTransaction.add(R.id.placeholder, newsFragment, NEWS_FRAGMENT);