activity-android中啟動服務的問題

android中啟動服務的問題

我想在一個活動開始時調用一個服務。
這是Service class:

public class UpdaterServiceManager extends Service {

private final int UPDATE_INTERVAL = 60 * 1000;
private Timer timer = new Timer();  
private static final int NOTIFICATION_EX = 1;
private NotificationManager notificationManager;

public UpdaterServiceManager(){}

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


@Override   
public void onCreate() {
  //code to execute when the service is first created

}   

@Override   
public void onDestroy() {   

    if (timer != null){
        timer.cancel();
    } 
}

@Override
public int onStartCommand(Intent intent, int flags, int startid) {  


    notificationManager = (NotificationManager) 
    getSystemService(Context.NOTIFICATION_SERVICE);

    int icon = android.R.drawable.stat_notify_sync;
    CharSequence tickerText = "Hello";
    long when = System.currentTimeMillis();

    Notification notification = new Notification(icon, tickerText, when);

    Context context = getApplicationContext();
    CharSequence contentTitle = "My notification";
    CharSequence contentText = "Hello World!";
    Intent notificationIntent = new Intent(this, Main.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 
        0, notificationIntent, 0);

    notification.setLatestEventInfo(context, contentTitle, 
        contentText, contentIntent);

    notificationManager.notify(NOTIFICATION_EX, notification);

    Toast.makeText(this, "Started!", Toast.LENGTH_LONG);
    timer.scheduleAtFixedRate(new TimerTask() {

        @Override
        public void run() {
            // Check if there are updates here and notify if true

        }       

    }, 0, UPDATE_INTERVAL);

    return START_STICKY;
}

private void stopService() {
    if(timer != null)
        timer.cancel();
}
}

這是調用Service的方法：

Intent serviceIntent = new Intent();
        serviceIntent.setAction("cidadaos.cidade.data.UpdaterServiceManager");
        startService(serviceIntent);

可結果是沒有調用成功。上面的代碼塊是在activity中的onCreate方法裡調用的。我調試過了也沒有拋出異常。
請大牛指點錯誤之處，謝謝。

最佳回答：

檢查下看在Manifest中有沒有注冊這個Service，我有時候會忘記注冊，導致花了很長時間來解決。