问如何在android中使用curl url进行json api集成

EN

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);
}

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;


}