Question

I have a layout file containing a listview that I would like to fill with the help of a Fragment. But it continues to give me errors.
The layout file:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<ListView
    android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true" >
</ListView>

<TableLayout
    android:id="@+id/details"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:stretchColumns="1" >

    <Button
        android:id="@+id/create_patient_button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/create_patient_button" />
</TableLayout>

</RelativeLayout>

My fragmentActivity:

public class BasicFragmentActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    setContentView(R.layout.create_patient_view);

    FragmentManager fm       = getSupportFragmentManager();
    Fragment        fragment = fm.findFragmentById(R.id.list);

    if (fragment == null) {


        FragmentTransaction ft = fm.beginTransaction();
        ft.add(R.id.list, new BasicFragment());
        ft.commit(); // Make sure you call commit or your Fragment will not be added. 
                     // This is very common mistake when working with Fragments!
    }
}

}

My ListFragment:

public class BasicFragment extends ListFragment {

private PatientAdapter pAdapter;

@Override
public void onActivityCreated(Bundle savedState) {
    super.onActivityCreated(savedState);

    pAdapter = new PatientAdapter(getActivity(), GFRApplication.dPatients);
    setListAdapter(pAdapter);
}
}

The error:
java.lang.UnsupportedOperationException: addView(View) is not supported in AdapterView

Answer 1

findFragmentById(...) function takes ID of fragment(!) as parameter. But you call it with R.id.list which is ID of ListView (<ListView android:id="@+id/list" ...). It’s wrong because ListView is NOT a fragment. It’s the first problem.

The second problem is:

  FragmentTransaction ft = fm.beginTransaction();
       ft.add(R.id.list, new BasicFragment());

in ft.add() function first parameter is ID of container in which you want to put your fragment. But you use R.id.list which is id of your ListView. It is wrong because ListView is not a container in which you can put fragments directly.

If you want put fragments into ListView items you can:

1. fill ListView with custom views.
2. declare <fragment ...> into custom view layout (XML). Or create fragment container in custom view layout (FrameLayout for example) and put there fragment at runtime (in getView() method).