public class HTTPPoster {
    public static HttpResponse doPost(String url, JSONObject c) throws ClientProtocolException, IOException 
    {

        HttpClient httpclient = new DefaultHttpClient();
        HttpPost request = new HttpPost(url);

        HttpEntity entity;
        StringEntity s = new StringEntity(c.toString());
        s.setContentEncoding((Header) new BasicHeader(HTTP.DEFAULT_CONTENT_CHARSET, "application/json"));
        entity = s;
        request.setEntity(entity);

        HttpResponse response;

        response = httpclient.execute(request);

        return response;
    }

}

Este es el código pero enresponse = http.client.execute(request) no recibe respuesta. No pude encontrar por qué.