Fixed TestListFragment that won't crash on hitting the back key

TestListFragment.java

package com.neenbedankt.listfragmentbug;

import android.annotation.TargetApi;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class TestListFragment extends ListFragment {

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        TextView tv = new TextView(getActivity());
        tv.setText("Hello");
        getListView().addHeaderView(tv);
        setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,
                new String[] { "Hello world" }));
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        setListAdapter(null);
    }
}