Code sample for getting a json response from a server using url.

JsonResponse.java

public class JsonResponse extends AsyncTask<String, Void, String>
    {
        String finalData = null;

        @Override
        protected String doInBackground(String... params)
        {
            Uri.Builder ub = new Uri.Builder();
            ub.scheme("http").authority("api.someapi.com").appendPath("somepath")
                    .appendQueryParameter("lng", "")
                    .appendQueryParameter("lat", "")
                    .appendQueryParameter("mode", "json");
            try {
                URL requestUrl = new URL(ub.toString());  // set link


                HttpURLConnection connection = (HttpURLConnection) requestUrl.openConnection(); // create connection
                connection.setRequestMethod("GET");  // set HTTP Method type
                connection.connect();  // connect to server

                int responseCode = connection.getResponseCode(); // get response code from server

                if (responseCode == HttpURLConnection.HTTP_OK) { // check if server says "Ok! i will respond to your request"

                    finalData = "";
                    BufferedReader reader = null; //Get buffer ready

                    InputStream inputStream = connection.getInputStream(); // get input stream from server ready

                    if (inputStream == null) { // if there is nothing in stream
                        return "";
                    }
                    reader = new BufferedReader(new InputStreamReader(inputStream));  // else pass stream data to buffer

                    String line;
                    while ((line = reader.readLine()) != null) {  // read each line

                        finalData += line; // save them to string
                    }

                    if (finalData.length() == 0) { // check if string is empty
                        return "";
                    }


                } else {
                    Log.i("Unsuccessful", "Unsuccessful HTTP Response Code: " + responseCode);
                }
            } catch (MalformedURLException e) {
                Log.e("Wrong URL", e.getMessage().toString(), e);
            } catch (IOException e) {
                Log.e("Error", "Error connecting to API", e);
            }
            return finalData;
        }

        @Override
        protected void onPostExecute(String result)
        {

            Log.d("JSON RESULT", result);

        }
    }