無法解析符號ErrorListener

Question

我正在嘗試設置凌空來從iTunes下拉此JSONObject

String url = "https://itunes.apple.com/search?term=michael+jackson";

重點是解析對象以獲取特定歌曲的專輯封面網址

所以我將這段代碼設置為獲取JsonObject，並且遇到了一些錯誤

Cannot resolve symbol ErrorListener
Cannot resolve symbol Listener

這是帶有注釋錯誤的代碼

JsonObjectRequest jsonRequest = new JsonObjectRequest
        (Request.Method.GET, url, null, new Downloader.Response.Listener // Cannot resolve symbol Listener
                <JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                // the response is already constructed as a JSONObject!
                try {
                    response = response.getJSONObject("args");
                    String site = response.getString("site"),
                            network = response.getString("network");
                    System.out.println("Site: "+site+"\nNetwork: "+network);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Downloader.Response.ErrorListener // Cannot resolve symbol ErrorListener
                () {

            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
            }
        });

Volley.newRequestQueue(this).add(jsonRequest);

Answer 1

試試Response.ErrorListener

http://afzaln.com/volley/com/android/volley/Response.ErrorListener.html

沒有Downloader.ResposneListener

Answer 2

改成

StringRequest stringRequest = new StringRequest（DownloadManager.Request.Method.GET，url，

至

StringRequest stringRequest = new StringRequest（com.android.volley.Request.Method.GET，url，

您的代碼將是

JsonObjectRequest jsonRequest = new JsonObjectRequest
    (Request.Method.GET, url, null, new com.android.volley.Response.Listener // CHANGES HERE
            <JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            // the response is already constructed as a JSONObject!
            try {
                response = response.getJSONObject("args");
                String site = response.getString("site"),
                        network = response.getString("network");
                System.out.println("Site: "+site+"\nNetwork: "+network);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new com.android.volley.Response.ErrorListener // CHANGES HERE
            () {

        @Override
        public void onErrorResponse(VolleyError error) {
            error.printStackTrace();
        }
    });

Volley.newRequestQueue（本）。新增（jsonRequest）;