/*
  * (non-Javadoc)
  *
  * @see android.app.Service#onDestroy()
  */
 @Override
 public void onDestroy() {
   // TODO Auto-generated method stub
   super.onDestroy();
   Log.e("Service Info", "Service Destoried.");
   if (Observer != null) Observer.stopWatching();
   Observer = null;
 }
  /*
   * (non-Javadoc)
   *
   * @see android.app.Service#onCreate()
   */
  @Override
  public void onCreate() {
    // TODO Auto-generated method stub
    super.onCreate();
    Log.e("Service Info", "Service Created.");
    /** 服务开启时,首先将此时此刻SD根目录下的所有文件夹信息放入SD_Files中 */
    SD_Files = new HashSet();
    File sd = new File(ROOTPATH);
    File[] files = sd.listFiles();
    for (File f : files) SD_Files.add(f.getName());

    /** 在此处进行Service需要执行的操作,监听SDcard中的文件夹创建情况 */
    Observer = new SD_Observer(ROOTPATH);
    Observer.startWatching();
  }