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Start your free trialTafadzwa Nyazorwe
17,053 PointsAwesome! So, finally, now that we are using 2 fragment types we need to remember to set and retrieve our fragments using
can someone assist, its almost a day trying to solve this challenge but failed Challenge 1 and 2 done
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";
Fragment savedFragment;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fragmentManager = getFragmentManager();
NewsFragment savedFragment = (NewsFragment) fragmentManager.findFragmentByTag(NEWS_FRAGMENT);
fragmentTransaction.replace(R.id.placeholder, fragment, NEWSITEM_FRAGMENT);
if (savedFragment == null) {
NewsFragment newsFragment = new NewsFragment();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.placeholder, newsFragment,"NEWS_FRAGMENT");
fragmentTransaction.commit();
//getFragmentManager().beginTransaction().replace(R.id.MainFrameLayout,fragmentA,"YOUR_TARGET_FRAGMENT_TAG").addToBackStack("YOUR_SOURCE_FRAGMENT_TAG").commit();
}
}
@Override
public void onNewsItemSelected(int index) {
NewsItemFragment fragment = new NewsItemFragment();
// TODO: how do we pass arguments to the new Fragment?
FragmentManager fragmentManager = getFragmentManager();
Bundle bundle = new Bundle();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
bundle.putInt(NewsItemFragment.KEY_NEWS_ITEM_INDEX,0);
fragment.setArguments(bundle);
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 = 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));
}
}
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
alastair cooper
30,617 Pointstake the quote marks off your tags when you pass them to fragmentTransaction
fragmentTransaction.replace(R.id.placeholder, fragment, "NEWSITEM_FRAGMENT");
should be
fragmentTransaction.replace(R.id.placeholder, fragment, NEWSITEM_FRAGMENT);
and same in the previous call
fragmentTransaction.add(R.id.placeholder, newsFragment,NEWS_FRAGMENT);