@Override
 protected void onPostExecute(final Boolean success) {
   if (success) {
     progressDialog.dismiss();
     mCallback.onFinish();
   } else {
     progressDialog.dismiss();
     Toast.makeText(context, "上传失败!!", Toast.LENGTH_SHORT).show();
   }
 }
  @Override
  protected void onCancelled() {
    total = 0;
    context = null;
    photoEntityList = null;

    mCallback.onCancel();
    mCallback = null;

    progressDialog.dismiss();
    progressDialog = null;
  }