使用Volley Library无法获得JSON

I'm using Volley library to get JSON. I can't load JSON using emulator which runs on Android 2.3, everything just fine with other versions. I have no ideas why it can't get JSON, especially on 2.3 devices.

我正在使用Volley库来获取JSON。我无法使用在Android 2.3上运行的模拟器加载JSON,其他版本的一切都很好。我不知道为什么它不能获得JSON,特别是在2.3设备上。

JSON Object request:

private void makeJsonObjectRequest() {
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Please wait...");
        pDialog.setCancelable(false);
        showpDialog();
        final JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.GET,
                urlJsonObj, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    extractJSONArray(response.getJSONArray("Accommodation"), "accommodation");

                } catch (JSONException e) {
                    e.printStackTrace();
                }
                adapter.notifyDataSetChanged();
                hidepDialog();
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d("Error: ", error.getCause().toString());
                error.printStackTrace();
                hidepDialog();
            }
        });
        AppController.getInstance().addToRequestQueue(jsonObjReq);
    }

My Log:

12-01 18:37:53.821      848-848/com.miesto.meniu D/Error﹕ org.json.JSONException: Value  of type java.lang.String cannot be converted to JSONObject
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ com.android.volley.ParseError: org.json.JSONException: Value  of type java.lang.String cannot be converted to JSONObject
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:73)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:121)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ Caused by: org.json.JSONException: Value  of type java.lang.String cannot be converted to JSONObject
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at org.json.JSON.typeMismatch(JSON.java:107)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:158)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at org.json.JSONObject.<init>(JSONObject.java:171)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ at com.android.volley.toolbox.JsonObjectRequest.parseNetworkResponse(JsonObjectRequest.java:68)
12-01 18:37:53.821      848-848/com.miesto.meniu W/System.err﹕ ... 1 more
12-01 18:37:55.001      848-848/com.miesto.meniu D/dalvikvm﹕ GC_EXTERNAL_ALLOC freed 421K, 55% free 3092K/6791K, external 811K/1260K, paused 53ms
12-01 18:37:55.431      848-848/com.miesto.meniu W/KeyCharacterMap﹕ No keyboard for id -1
12-01 18:37:55.431      848-848/com.miesto.meniu W/KeyCharacterMap﹕ Using default keymap: /system/usr/keychars/qwerty.kcm.bin

Any ideas?

1 个解决方案

#1

Ok first of all use Gson library it will make your life easier:

好的,首先使用Gson库,它会让你的生活更轻松:

And then make POJO of your responses e.g.

然后为您的回复制作POJO,例如

public class Accommodation {
    public String id;
    public String icon;
    public String name;
    public String nameEn;
    public String type;
    public String fotoLinks;
    public String address;
    public String workHours;
    public String description;
    public String descriptionEn;
    public String votes;
    public String voters;
    public String number;
    public String email;
    public String latitude;
    public String longitude;
}

And now combine all pojo classes to match your server response:

现在结合所有pojo类来匹配您的服务器响应:

public class ServerResponse {
    public List<Accommodation> Accommodation;
    public List<CashMachines> Cash_machines; // assuming you have CashMachines as well like above
}

And now build a request:

现在建立一个请求:

Request<ServerResponse> request = new GsonRequest<ServerResponse>(Request.Method.GET, 
     url,AnalyticsData.class, new Response.Listener<ServerResponse>() {
        @Override
        public void onResponse(ServerResponse response) {
               // user response here
               Log.d(">>", response.Accommodation.size()+"");
        }, errorListener);

and now use this request.

现在使用此请求。

Here is GsonRequest. Make sure to download gson jar file from here.

这是GsonRequest。确保从这里下载gson jar文件。

Please note that existing code will immediately start working with this url http://njreteazza.lt.ricina.serveriai.lt/info.php i.e. you don't even need to create pojo classes for all types that are returned just Keep adding pojo classes when you need them.

请注意,现有代码将立即开始使用此URL http://njreteazza.lt.ricina.serveriai.lt/info.php,即您甚至不需要为所有返回的类型创建pojo类。继续添加pojo你需要的课程。

#1