@Override
 public void onPostExecute(FileManageTask task) {
   if (mFileObserver != null) {
     mFileObserver.deleteFinished(mFilesDeleted, mFilesNotDeleted);
   }
   dismissProgressDialog();
   if (mTaskList != null) {
     mTaskList.remove(task);
   }
 }
  /**
   * 删除文件
   *
   * @param path
   * @param type
   */
  public void deleteFile(String path, int type) {
    File file = new File(path);
    boolean ret = false;
    if (file.exists()) {
      ret = file.delete();
    } else {
      ret = true;
    }

    if (ret) {
      Category category = null;
      String key = MediaFileUtil.getPathFromFilepath(path);
      if (type == TYPE_AUDIO) {
        category = mAudioCategory.get(key);
        mDeletedAudioList.add(path);
      }

      if (type == TYPE_IMAGE) {
        category = mImageCategory.get(key);
        mDeletedImageList.add(path);
      }

      if (type == TYPE_VIDEO) {
        category = mVideoCategory.get(key);
        mDeletedVideoList.add(path);
      }

      if (null != category) {
        category.deleteFile(path);
      }

      removeDataFromDB(path, type);
    }

    mFileObserver.deleteFinished(path, ret);
  }