在Service中使用Notification，编译通过，但程序貌似没有执行

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在Service中使用Notification，编译通过，但程序貌似没有执行25

代码如下：

import tony.download.HttpDownloader;
import tony.model.Mp3Info;
import tony.mp3player.Mp3ListActivity;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.IBinder;

public class DownloadService extends Service{
	private static final int ID_NOTIFICATION = 0;
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	//每次用户点击ListActivity当中的一个条目时，就会调用该方法
	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		//从Intent对象当中将Mp3Info对象取出
		Mp3Info mp3Info = (Mp3Info)intent.getSerializableExtra("mp3Info");
		//生成一个下载线程，并将Mp3Info对象作为参数传递到线程对象当中
		DownloadThread downloadThread = new DownloadThread(mp3Info);
		//生成一个新线程
		Thread thread = new Thread(downloadThread);
		//启动新线程
		thread.start();
		return super.onStartCommand(intent, flags, startId);
	}

	class DownloadThread implements Runnable{
		private Mp3Info mp3Info = null;
		public DownloadThread(Mp3Info mp3Info){
			this.mp3Info = mp3Info;
		}
		@Override
		public void run() {
			//把文件中含有的空格替换
			String Mp3Name = mp3Info.getMp3Name().replaceAll(" ", "%20");
			//根据MP3文件的名字，生成下载地址（下载地址http://192.168.1.100:8080/mp3/）
			String mp3Url = "http://192.168.1.100:8080/mp3/" + Mp3Name;
			//生成下载文件所用的对象
			HttpDownloader httpDownloader = new HttpDownloader();
			//将文件下载下来，并存储到SDCard当中
			int result = httpDownloader.downFile(mp3Url, "mp3/", mp3Info.getMp3Name());
			System.out.println(result);
			String resultMessage = null;
			if(result == -1){
				resultMessage = "下载失败";
			}
			else if(result == 0){
				resultMessage = "文件已经存在，不需要重复下载";
			}
			else if(result == 1){
				resultMessage = "文件下载成功";
			}
			//使用Notification提示客户下载结果
			System.out.println(resultMessage);
			Context context = getApplicationContext();
			System.out.println(context);
			System.out.println(this);
			notification(context, resultMessage);
		}
		
	}
	public void notification(Context context, CharSequence contentText){			
		CharSequence contentTitle = "下载信息";
		Intent notificationIntent = new Intent(context,Mp3ListActivity.class);
		PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
		String ns = Context.NOTIFICATION_SERVICE;
		//创建NotificationManager对象
		NotificationManager mNotificationManager = (NotificationManager)getSystemService(ns);
		//创建Notification对象
		Notification downloadMessageNotification = new Notification();
		downloadMessageNotification.defaults = Notification.DEFAULT_VIBRATE;
		downloadMessageNotification.flags=Notification.FLAG_AUTO_CANCEL;
		//设置Notification对象的属性
		downloadMessageNotification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
		//发送Notification
		mNotificationManager.notify(ID_NOTIFICATION,downloadMessageNotification);
	}
}

本来想实现在Listview中点击，然后调用Service下载文件，最后用Notification通知用户下载信息的。但程序编译通过后，似乎没有执行Notification（通知栏没显示）。上传的附件是应用涉及的几个文件。（ps：本人Android菜鸟，望各位达人多多解答，不胜感激~）