Android: Add a listfragment to the transaction

Question

I try to add the listfragment with fragmentTransation.add(...) but I can't do it, it is an error. I want to add a listfragment like a normal fragment, is it possible?

Here is my activity main code:

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    FragmentList fragmentList = FragmentList.createFragment();
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.add(R.id.relativeLayout,fragmentList); //WRONG
    fragmentTransaction.commit();
}

Here is my listfragment class code:

public class FragmentList extends ListFragment
{
public static FragmentList createFragment()
{
    FragmentList fragmentList = new FragmentList();
    return fragmentList;
}

@Override
public void onCreate(Bundle bundle)
{
    super.onCreate(bundle);
    ListView listView = getListView();
    String[] stringa = {"A","B","C"};
    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,stringa);
    listView.setAdapter(arrayAdapter);

}

@Override
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    super.onCreateView(inflater,container,savedInstanceState);
    View rootView = inflater.inflate(R.layout.fragment, container, false);
    return rootView;
}
}

Answer 1

1) You cannot use android.app.ListFragment with SupportFragmentManger you can use getFragmentManager() for that.

Basically, check your import statements.

Or you may extend android.support.v4.app.Fragment instead and define your own layout with a <ListView> (like you already are doing)

Or you can use android.support.v4.app.ListFragment

---

More importantly, though

2) getListView() can't be called from onCreate because there is no view yet.

You only need onCreateView

public class FragmentList extends ListFragment {

    @Override
    public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        super.onCreateView(inflater,container,savedInstanceState);
        View rootView = inflater.inflate(R.layout.fragment, container, false);
        String[] stringa = {"A","B","C"};

        ListView listView = (ListView) rootView.findViewById(android.R.id.list);
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,stringa);
        listView.setAdapter(arrayAdapter);

        return rootView;
    }
}

Plus,

getFragmentManager() // Change accordingly
    .beginTransaction()
    .add(R.id.relativeLayout,new FragmentList())
    .commit();