如何在Android中獲取凌空JSONArray

Question

我是Volley JSONArray的新手。 我無法在txtResponse中設置 setText ，因為我總是在onErrorResponse遇到此錯誤。

這是我的Logcat

...... com.example.simplevolley.simplevolley W / System.err：org.json.JSONException：值[{“ com_branch_id”：7，“ com_branch_comId”：1，“ com_branch_name”：“ JT Temerloh”，“ com_branch_manager“：” Tn Hj Ahmad Bin Hj Mohd Sidin“，” com_branch_addr“：” 58號，惹蘭易卜拉欣（Jln Masjid Abu Bakar）“，” com_branch_region“：” Temerloh“，” com_branch_state“：” PAHANG“，” com_branch_count“ “：” MALAYSIA“，” com_branch_poscode“：” 28000“，” com_branch_email“：” tmlh@juaratravel.com.my“，” com_branch_licence“：null，” com_branch_phoneNum“：” 09-2965625“，” com_branch_fax“：null， “ com_branch_fb”：null，“ com_branch_ig”：null}，{“ com_branch_id”：9，“ com_branch_comId”：1，“ com_branch_name”：“ JT Nibong Tebal”，“ com_branch_manager”：“ Pejabat Penang”，“ com_branch_addr”： No. 10，Tingkat Atas，Jln Pekaka 1，Tmn Pekaka，“，” com_branch_region“：” Nibong Tebal“，” com_branch_state“：” PULAU PINANG“，” com_branch_country“：” MALAYSIA“，” com_branch_poscode“：” 14300“， “ com_branch_email”：“ pen@juaratravel.com.my”，“ com_branch_licence”：空，“ com_branch_phoneNum”：“ 05-7171877”，“ com_branch_fa x“：” 057161877“，” com_branch_fb“：null，” com_branch_ig“：null} ......

我想閱讀此JSON行，但是因為它以JSONArray開頭，所以我很困惑。

{
"res": true,
"datas": [
    {
        "com_branch_id": 7,
        "com_branch_comId": 1,
        "com_branch_name": "JT Temerloh",
        "com_branch_manager": "Tn Hj Ahmad Bin Hj Mohd Sidin",
        "com_branch_addr": "No.58, Jalan Ibrahim (Jln Masjid Abu Bakar)",
        "com_branch_region": "Temerloh",
        "com_branch_state": "PAHANG",
        "com_branch_country": "MALAYSIA",
        "com_branch_poscode": "28000",
        "com_branch_email": "tmlh@juaratravel.com.my",
        "com_branch_licence": null,
        "com_branch_phoneNum": "09-2965625",
        "com_branch_fax": null,
        "com_branch_fb": null,
        "com_branch_ig": null
    },
    {
        "com_branch_id": 9,
        "com_branch_comId": 1,
        "com_branch_name": "JT Nibong Tebal",
        "com_branch_manager": "Pejabat Penang",
        "com_branch_addr": "No. 10, Tingkat Atas, Jln Pekaka 1, Tmn Pekaka,",
        "com_branch_region": "Nibong Tebal",
        "com_branch_state": "PULAU PINANG",
        "com_branch_country": "MALAYSIA",
        "com_branch_poscode": "14300",
        "com_branch_email": "pen@juaratravel.com.my",
        "com_branch_licence": null,
        "com_branch_phoneNum": "05-7171877",
        "com_branch_fax": "057161877",
        "com_branch_fb": null,
        "com_branch_ig": null
    },]}

我需要獲取所有數據值。 這是我的代碼

 private void makeJsonArrayRequest() {
    showpDialog();

    JsonArrayRequest req = new JsonArrayRequest(urlJsonArry,
            new Response.Listener<JSONArray>() {
                @Override
                public void onResponse(JSONArray response) {
                    Log.d("res", response.toString());

                    try {


                        jsonResponse = "";
                        for (int i = 0; i < response.length(); i++) {


                            JSONObject branchi = (JSONObject) response.get(i);
                            JSONObject branch = branchi.getJSONObject("datas");


                            Integer com_branch_id = Integer.valueOf(branch.getString("com_branch_id"));
                            Integer com_branch_comId = Integer.valueOf(branch.getString("com_branch_comId"));
                            String com_branch_name = branch.getString("com_branch_name");
                            String com_branch_manager = branch.getString("com_branch_manager");
                            String com_branch_addr = branch.getString("com_branch_addr");
                            String com_branch_region = branch.getString("com_branch_region");
                            String com_branch_state = branch.getString("com_branch_state");
                            String com_branch_country = branch.getString("com_branch_country");
                            String com_branch_poscode = branch.getString("com_branch_poscode");
                            String com_branch_email = branch.getString("com_branch_email");
                            String com_branch_licence = branch.getString("com_branch_licence");
                            String com_branch_phoneNum = branch.getString("com_branch_phoneNum");
                            String com_branch_fax = branch.getString("datas.com_branch_fax");
                            String com_branch_fb = branch.getString("datas.com_branch_fb");
                            String com_branch_ig = branch.getString("datas.com_branch_ig");


                            jsonResponse = "";
                            jsonResponse += "Branch name: " + com_branch_id + "\n\n";
                            jsonResponse += "Branch manager: " + com_branch_comId + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_name + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_manager + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_addr + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_region + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_state + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_country + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_poscode + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_email + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_licence + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_phoneNum + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_fax + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_fb + "\n\n";
                            jsonResponse += "Branch state: " + com_branch_ig + "\n\n";

                        }

                        txtResponse.setText(jsonResponse);

                    } catch (JSONException e) {
                        e.printStackTrace();
                        Toast.makeText(getApplicationContext(),
                                "res" + e.getMessage(),
                                Toast.LENGTH_LONG).show();

                        txtResponse.setText(e.getMessage());
                    }

                    hidepDialog();
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            VolleyLog.d(TAG, "res" + error.getMessage());
            Toast.makeText(getApplicationContext(),
                    error.getMessage(), Toast.LENGTH_LONG).show();
            Log.d("onErrorResponse", error.getMessage());
            hidepDialog();

        }
    });

    // Adding request to request queue
    AppController.getInstance().addToRequestQueue(req);
}

我嘗試遵循其他解決方案，但不幸的是，我失敗了並陷入困境。

Answer 1

嘗試這個..

 JSONObject json = new JSONObject(response);

    JSONArray jsonarray = json.getJSONArray("datas");

    for (int i = 0; i < jsonarray.length(); i++) {
         JSONObject c = jsonarray.getJSONObject(i);

         //here you get by json key
         String id = c.getString("com_branch_id");

    }

Answer 2

1）您的Json不是數組（它以{表示對象json開頭）。 使用JsonObjectRequest。
2）通過迭代，您可以使用jackson2將響應映射到POJO而不是在響應中獲取元素。
3）您可以使用jsonschema2pojo創建一個POJO類

Answer 3

JsonArrayRequest將為您提供JSONArray響應。 但是您的響應不是JSONArray 。 它的JSONObject和該JSONObject包含JSONArray 。

為您的案例使用JsonObjectRequest 。

您可以使用Gson將響應轉換為Java對象。

制作一個與您的響應格式匹配的Java Pojo類。 比將您的響應轉換為java對象。

        public void onResponse(JSONObject response) {

            String message = "";
            if (response != null) {
                message = response.toString();
                Post post = null;
                Gson gson = new Gson();
                post = gson.fromJson(response.toString(), Post.class);

            } else {
                message = "Response is null";

            }
        }