AsyncTask and error handling on Android

Question

I\'m converting my code from using Handler to AsyncTask. The latter is great at what it does - asynchronous updates and handling of results in the

Answer 1

Another possibility would be to use Object as return type, and in onPostExecute() check for the object type. It is short.

class MyAsyncTask extends AsyncTask {

    @Override
    protected AsyncTaskResult doInBackground(MyInObject... myInObjects) {
        try {
            MyOutObject result;
            // ... do something that produces the result
            return result;
        } catch (Exception e) {
            return e;
        }
    }

    protected void onPostExecute(AsyncTaskResult outcome) {
        if (outcome instanceof MyOutObject) {
            MyOutObject result = (MyOutObject) outcome;
            // use the result
        } else if (outcome instanceof Exception) {
            Exception e = (Exception) outcome;
            // show error message
        } else throw new IllegalStateException();
    }
}