AsyncTask：将异常值从doInBackground传递给onPostExecute

Question

我试图将我的doInBackground之间的错误消息传递给onPostExecute。 有没有办法使用数据结构来做到这一点？ 在我的情况下，我正在尝试避免创建一个类并返回一个对象

                    @Override
        protected User doInBackground(List<Pair<String, String>>... params) {
            randomAPI api = randomAPI
                    .getInstance(context);

            try {
                **thing that will generate error**
                }

            } catch (RandomException e) {
                Log.e(TAG, "Error", e);
            }
            return somethingThatIsUsableInOnPostExecute;
        }

        @Override
        protected void onPostExecute(User result) {

            }

Answer 1

private String exception = "";
@Override
    protected User doInBackground(List<Pair<String, String>>... params) {
        randomAPI api = randomAPI
                .getInstance(context);

        try {
            **thing that will generate error**
            }

        } catch (RandomException e) {
            Log.e(TAG, "Error", e);
            exception = e.getMessage();
        }
        return somethingThatIsUsableInOnPostExecute;
    }

    @Override
    protected void onPostExecute(User result) {
            if(!exception.isEmpty()){
                //exception path
            }
        }

Answer 2

您应该尝试将doInBackground return类型从User对象更改为Object并将其onPostExecute 。