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

Create an AsyncResult object ( which you can also use in other projects)

public class AsyncTaskResult {
    private T result;
    private Exception error;

    public T getResult() {
        return result;
    }

    public Exception getError() {
        return error;
    }

    public AsyncTaskResult(T result) {
        super();
        this.result = result;
    }

    public AsyncTaskResult(Exception error) {
        super();
        this.error = error;
    }
}

Return this object from your AsyncTask doInBackground methods and check it in the postExecute. ( You can use this class as a base class for your other async tasks )

Below is a mockup of a task that gets a JSON response from the web server.

AsyncTask> jsonLoader = new AsyncTask>() {

        @Override
        protected AsyncTaskResult doInBackground(
                Object... params) {
            try {
                // get your JSONObject from the server
                return new AsyncTaskResult(your json object);
            } catch ( Exception anyError) {
                return new AsyncTaskResult(anyError);
            }
        }

        protected void onPostExecute(AsyncTaskResult result) {
            if ( result.getError() != null ) {
                // error handling here
            }  else if ( isCancelled()) {
                // cancel handling here
            } else {

                JSONObject realResult = result.getResult();
                // result handling here
            }
        };

    }