RSS 만들려고하는데요..문제가 생기네요

Question

Fragment 사용해서 RSS news 만들어서 리스트에 항목마다 링크타고 가서 뉴스를 볼수있게 하려고 하는데요

이게 리스트가 뜨는 activity고요

package com.murach.newsreader;

import android.app.Activity;
import android.os.Bundle;

public  class ItemsActivity extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_items);
    }
}

이게 Fragment로 옮긴거거요

package com.murach.newsreader;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

public class ItemsFragment extends Fragment
        implements OnItemClickListener {

    private RSSFeed feed;
    private FileIO io;

    private TextView titleTextView;
    private ListView itemsListView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
                              savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_items, container, false);


        titleTextView = (TextView)view.findViewById(R.id.titleTextView);
        itemsListView = (ListView)view.findViewById(R.id.itemsListView);

        itemsListView.setOnItemClickListener(this);
        return view;

    }

    class DownloadFeed extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... params) {
            io.downloadFile();
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            Log.d("News reader", "Feed downloaded");
            new ReadFeed().execute();
        }
    }

    class ReadFeed extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... params) {
            feed = io.readFile();
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            Log.d("News reader", "Feed read");

            // update the display for the activity
            ItemsFragment.this.updateDisplay();
        }
    }

    public void updateDisplay()
    {
        if (feed == null) {
            titleTextView.setText("Unable to get RSS feed");
            return;
        }

        // set the title for the feed
        titleTextView.setText(feed.getTitle());

        // get the items for the feed
        ArrayList<RSSItem> items = feed.getAllItems();

        // create a List of Map<String, ?> objects
        ArrayList<HashMap<String, String>> data =
                new ArrayList<HashMap<String, String>>();
        for (RSSItem item : items) {
            HashMap<String, String> map = new HashMap<String, String>();
            map.put("date", item.getPubDateFormatted());
            map.put("title", item.getTitle());
            data.add(map);
        }

        // create the resource, from, and to variables 
        int resource = R.layout.listview_item;
        String[] from = {"date", "title"};
        int[] to = {R.id.pubDateTextView, R.id.titleTextView};

        // create and set the adapter
        SimpleAdapter adapter =
                new SimpleAdapter(getActivity(), data, resource, from, to);
        itemsListView.setAdapter(adapter);

        Log.d("News reader", "Feed displayed");
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View v,
                            int position, long id) {

        // get the item at the specified position
        RSSItem item = feed.getItem(position);

        // create an intent
        Intent intent = new Intent();

        intent.putExtra("pubDate", item.getPubDate());
        intent.putExtra("title", item.getTitle());
        intent.putExtra("description", item.getDescription());
        intent.putExtra("link", item.getLink());

        this.startActivity(intent);
    }
}

이렇게 실행을 시키면 리스트가 안뜹니다 오류는 발생하지 않고요

자세한 코드 원하시면 보내드릴수 있습니다