Android - ช่วยดูแนะแนววิธีการแก้ Code นี้ให้หน่อยครับ..

public class MyService extends Service {

	public static String s;
	Boolean _isTime = true;
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		
		
		realTime.start();
		

	}

	Thread realTime = new Thread() {

		@Override
		public void run() {
			   try {
	                if(_isTime) {
	                    while(_isTime){
	                     
	                    	new onConnect().execute("http://krokkrak.com/test.php");
	                        sleep(4000);
	                        
	                    }
	                     
	                } else{
	                	realTime.stop();
	                }
	            } catch (InterruptedException e) {
	                e.printStackTrace();
	                
	            }
			   
		}
		
	};

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}


	public class onConnect extends AsyncTask<String, String, String> {
		HttpClient http;
		String resString;
		HttpResponse res;

		@Override
		protected String doInBackground(String... params) {
			resString = null;
			try {
				http = new DefaultHttpClient();
				res = http.execute(new HttpGet(params[0]));
				ByteArrayOutputStream output = new ByteArrayOutputStream();
				res.getEntity().writeTo(output);
				output.close();

				resString = output.toString();
			} catch (Exception e) {
				Log.e("Connect", e.toString());
			}
			return resString;
		}

		@Override
		protected void onPostExecute(String result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
			
			System.out.println(result);
		}

	}

}