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Android Threads and Services Introducing Services Creating a Service

Finally, inside the Button's onClickListener, start the new TwitterService. And don't forget to call 'stopSelf()' on the

Could you kindly assist I am getting a compile error.

TwitterService.java
public class TwitterService extends Service {
  TwitterClient twitterClient = new TwitterClient(); 
  TwitterThread twitterThread;
  TwitterService service;

  @Override 
  public void onCreate() {
            twitterThread = new TwitterThread();
            twitterThread.setName("DownloadThread");
            twitterThread.start();

             }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

   @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Message message = Message.obtain();
        twitterThread.twitterHandler.sendMessage(message);
        return Service.START_REDELIVER_INTENT;
    }



  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();
      service.stopSelf();

    }
  }
}
MainActivity.java
public class MainActivity extends Activity {
  Button button;   
 TwitterService service;

  @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){
        service.startService();

      }
    });
  }
}