android - How to get JSON object using HttpURLConnection instead of Volley?

Question

What I'm trying to do is get some data from a HttpURLConnection instead of using JsonObjectRequest() from the Volley library.

Below is the code that I use to grab a JSON object from my server.

JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET,"myURL", null, new Response.Listener<JSONObject>();

I tried changing the null to a JSONObject after myURL was changed to null. But that did not work out.

Answer 1

The url in JsonObjectRequest() is not optional, and the JSONObject parameter is used to post parameters with the request to the url.

From the documentation: http://afzaln.com/volley/com/android/volley/toolbox/JsonObjectRequest.html

http://developer.android.com/training/volley/index.html

JsonObjectRequest

public JsonObjectRequest(int method, String url, JSONObject jsonRequest, Response.Listener listener, Response.ErrorListener errorListener) Creates a new request.

Parameters:

method - the HTTP method to use

url - URL to fetch the JSON from

jsonRequest - A JSONObject to post with the request. Null is allowed and indicates no parameters will be posted along with request.

listener - Listener to receive the JSON response

errorListener - Error listener, or null to ignore errors.

Using HttpURLConnection:

http://developer.android.com/reference/java/net/HttpURLConnection.html

The code would be something like this:

 public class getData extends AsyncTask<String, String, String> {

        HttpURLConnection urlConnection;

        @Override
        protected String doInBackground(String... args) {

            StringBuilder result = new StringBuilder();

            try {
                URL url = new URL("https://api.github.com/users/dmnugent80/repos");
                urlConnection = (HttpURLConnection) url.openConnection();
                InputStream in = new BufferedInputStream(urlConnection.getInputStream());

                BufferedReader reader = new BufferedReader(new InputStreamReader(in));

                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

            }catch( Exception e) {
                e.printStackTrace();
            }
            finally {
                urlConnection.disconnect();
            }


            return result.toString();
        }

        @Override
        protected void onPostExecute(String result) {

            //Do something with the JSON string

        }

    }