Question

I am developing an android application that rely very much on internet, I retrieve data frequently using this RestClient Class, that wrap some detail on using DefaultHttpClient to do network request.

And I always use different thread to do the HTTP request, I create a class like this:

public class AsyncWorker {

    final String SERVER_URL = "http://api.blabla.com";
    RestClient client = new RestClient();

    public void requestHttp(final String url, final ArrayList<NameValuePair> params, final RequestListener listener) {
        new Thread(new Runnable() {

            public void run() {
                try {
                    client.setUrl(url);
                    client.setParams(params);
                    client.Execute(RestClient.RequestMethod.POST);
                    String response = client.getResponse();
                    listener.onComplete(response);
                } catch (Exception ex) {
                    Log.d("LOGIN", ex.getMessage());
                }
            }
        }).start();
    }
    etc...

So whenever I need to do a HTTP request, I only need to create AsyncWorker object, and provide the RequestListener callback interface.

But the problem is, how can I cancel the HTTP Request when the user press the back/cancel button? and in this case the application still is in one activity, for example I create a dialog, and the user do a request from that dialog, and then back button pressed, the dialog dismissed, and I need to cancel the request on that time.

Answer 1

I suggest you take a look at the ClientConnectionManager interface. This allows you to do stuff like releasing a connection, shutting down a connection etc. You may need to enhance the implementation of RestClient though – since your RestClient does not expose the underlying DefaultHttpClient object (from which you can get to the ClientConnectionManager using the getClientConnectionManager() method).