help i am stuck here on threads

public class TwitterService extends Service {
  TwitterClient twitterClient = new TwitterClient();    
    private TwitterHandler twitterHandler;
  @Override
 public void OnCreate(){
TwitterThread twitterThread = new TwitterThread();
   twitterThread.start();

 twitterHandler =twitterThread.twitterHandler;
 }

  class TwitterThread extends Thread {
    TwitterHandler twitterHandler;
    @Override
    public void run() {
      Looper.prepare();
      twitterHandler = new TwitterHandler();
      Looper.loop();
    }
  }    

  class TwitterHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
     // twitterClient.update();
    }
  }
}

public class MainActivity extends Activity {
  Button button;   

  @Override
  public void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.activity_main);

    button = (Button) findViewById(R.id.update_button);
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v){

      }
    });
  }
}