How to use HttpClient (or other HTTP class) to retrieve JSON asynchronously

I've got the content from a HttpClient, but I'm not sure where to go next, in order to parse my JSON result. Also, how do I do this asynchronously so that I can display a wait dialog to the user with the option of cancelling the current request (not bothered about the UI example, how do I setup the HTTP class to be cancellable)?

    HttpClient client = new DefaultHttpClient();
    HttpGet request = new HttpGet("http://mysite/test.json");
    开发者_运维技巧try
    {
        HttpResponse response = client.execute(request);
                    // What if I want to cancel now??
        HttpEntity entity = response.getEntity();
        InputStream inputStream = entity.getContent();
    }

Android has a class specifically for this sort of thing: AsyncTask.

See the answer to this question: How to create Http Connection using AsyncTask class?

I'm not a Android programmer but I imagine you need to start a thread.

http://download.oracle.com/javase/tutorial/essential/concurrency/