How to use curl url for json api integration in android

Use Volley to do the cURL request.

private void getResponse(){    String URL = "https://api.infermedica.com/v2/symptoms";    RequestQueue queue = Volley.newRequestQueue(this);    StringRequest request = new StringRequest(Request.Method.GET, URL,            new Response.Listener<String>() {                @Override                public void onResponse(String response) {                    Log.e("Check Response",response);                }            },            new Response.ErrorListener() {                @Override                public void onErrorResponse(VolleyError error) {                    Log.e("Check Error","Error");                }            }    ){        @Override        public byte[] getBody() throws AuthFailureError {            return new byte[]{};        }        @Override        public Map<String, String> getHeaders() throws AuthFailureError {            Map<String,String> map = new HashMap<>();            map.put("Content-Type","application/json");            map.put("Accept", "application/json");            map.put("app_id","90f10c6a");            map.put("app_key","9d23d9250d9f2ee8aa49efda732e4d3d");            return map;        }    };    request.setRetryPolicy(new DefaultRetryPolicy(15000, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_MAX_RETRIES));    queue.add(request);}

This is my function to get JSON object

public JSONObject getJSONFromUrl(String url) {    // Making HTTP request    try {        // defaultHttpClient        DefaultHttpClient httpClient = new DefaultHttpClient();        HttpPost httpPost = new HttpPost(url);        HttpResponse httpResponse = httpClient.execute(httpPost);        HttpEntity httpEntity = httpResponse.getEntity();        is = httpEntity.getContent();    } catch (UnsupportedEncodingException e) {        e.printStackTrace();    } catch (ClientProtocolException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }    try {        BufferedReader reader = new BufferedReader(new InputStreamReader(                is, "iso-8859-1"), 8);        StringBuilder sb = new StringBuilder();        String line = null;        while ((line = reader.readLine()) != null) {            sb.append(line + "\n");        }        is.close();        json = sb.toString();    } catch (Exception e) {        Log.e("Buffer Error", "Error converting result " + e.toString());    }    // try parse the string to a JSON object    try {        jObj = new JSONObject(json);    } catch (JSONException e) {        Log.e("JSON Parser", "Error parsing data " + e.toString());    }    // return JSON String    return jObj;}

How can i add your code in it?