@Override
  public void onUpdate(DownloadTask task) throws RemoteException {
    if (task == null) {
      return;
    }
    if (task != null) {
      long currentTime = System.currentTimeMillis();

      if (mStartDonwload == 0) {
        mStartDonwload = currentTime;
        mAlreadyDownloadSize = task.getAlreadyDownloadSize();
      }

      if (currentTime - mPrevRefreshTime > REFRESH_INTERVAL) {
        mPrevRefreshTime = currentTime;

        if (mShowNotification && mNotificationManager != null && mNotification != null) {
          // 更新通知栏的step为1%
          if (task.getAlreadyDownloadPercent() < mPercentCount && mPercentCount > 100) {
            return;
          }
          sendBroadcastingToAppCenter(task);
          mPercentCount += mStep;
          mDisplayPercent = task.getAlreadyDownloadPercent();
          mNotification.flags = Notification.FLAG_ONGOING_EVENT;
          mNotification.contentIntent = mPendingIntent;
          mNotification.setLatestEventInfo(
              mContext,
              mDownloadText,
              mProgressText + " " + task.getAlreadyDownloadPercent() + "%",
              mPendingIntent);
          //					mNotificationManager.notify(NOTIFY_TAG, (int) task.getId(), mNotification);
          if (mNotification.contentView != null) {
            mNotificationManager.notify(NOTIFY_TAG, (int) task.getId(), mNotification);
          }
        }
      }
    }
  }