如何在应用程序启动时显示ProgressDialog?

阿卡,这怎么了code:-

package com.mez.appofjaq;

import com.mez.appofjaq.RssParser.RssFeed;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.webkit.WebView;

public class AppOfJaq extends Activity {

    protected static final int REFRESH = 0;

    String streamTitle = "";
    protected ProgressDialog pd;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        pd.show(this, "Loading..", "Loading Feed");
        setContentView(R.layout.main);
        new Thread(new Runnable(){
            public void run() {
                loadFeed();
                pd.dismiss();
            }
        }).start();

    }

    private void loadFeed()
    {
        RssParser rp = new RssParser("http://shotofjaq.org/feed");
        rp.parse();

        RssFeed feed = rp.getFeed();

        if (feed.getItems() != null)
        {
            streamTitle = feed.getItems().get(0).content;
        }
        WebView result = (WebView)findViewById(R.id.result);
        result.loadData(streamTitle, "text/html", "utf-8");
    }

}