Sending a JSON Request from android

Similar to sending a regular HTTP request, android-async-http can also be used for sending JSON API requests:

String url = "https://ajax.googleapis.com/";
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("q", "android");
params.put("rsz", "8");
client.get(url, params, new JsonHttpResponseHandler() {         
    @Override
    public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
       // Root JSON in response is an dictionary i.e { "data : [ ... ] }
       // Handle resulting parsed JSON response here
    }

        @Override
        public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
            // called when response HTTP status is "4XX" (eg. 401, 403, 404)
        }
});

The request will be sent out with the appropriate parameters passed in the query string and then the response will be parsed as JSON and made available within onSuccess. Check the Converting JSON to Models guide for more details on parsing a JSON response.