JSON 类型不匹配或 org.json.jsonecxeption

Question

链接是 http://iipacademy.in/askpoll/ten_feed.php

onPostExecute() 方法中有异常（第 4 行）：

Log.i("result", result);
try {
    if (result != null) {
        JSONArray jsonArray = new JSONArray(result); // erreor
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject objJson = jsonArray.getJSONObject(i);

            TopTenGetterSetter obj = new TopTenGetterSetter();  


            obj.setQ(objJson.getString("question"));
            obj.setA(objJson.getString("option1"));
            obj.setB(objJson.getString("option2"));
            obj.setC(objJson.getString("option3"));
            obj.setD(objJson.getString("option4"));

            polls.add(obj);
                        }

    }
} catch (JSONException e) {
    e.printStackTrace();
    Toast.makeText(getApplicationContext(), "error",
            Toast.LENGTH_SHORT).show();
}

LOGCAT：

12-18 03:20:45.447: W/System.err(2790): org.json.JSONException: Value response of type java.lang.String cannot be converted to JSONArray
12-18 03:20:45.447: W/System.err(2790):     at org.json.JSON.typeMismatch(JSON.java:111)
12-18 03:20:45.447: W/System.err(2790):     at org.json.JSONArray.<init>(JSONArray.java:91)
12-18 03:20:45.447: W/System.err(2790):     at org.json.JSONArray.<init>(JSONArray.java:103)
12-18 03:20:45.447: W/System.err(2790):     at com.example.askpollie.LatestPollParticipated$FetchingEventsDetails.onPostExecute(LatestPollParticipated.java:188)
12-18 03:20:45.447: W/System.err(2790):     at com.example.askpollie.LatestPollParticipated$FetchingEventsDetails.onPostExecute(LatestPollParticipated.java:1)
12-18 03:20:45.447: W/System.err(2790):     at android.os.AsyncTask.finish(AsyncTask.java:631)
12-18 03:20:45.447: W/System.err(2790):     at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-18 03:20:45.447: W/System.err(2790):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
12-18 03:20:45.447: W/System.err(2790):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-18 03:20:45.447: W/System.err(2790):     at android.os.Looper.loop(Looper.java:137)
12-18 03:20:45.447: W/System.err(2790):     at android.app.ActivityThread.main(ActivityThread.java:5103)
12-18 03:20:45.447: W/System.err(2790):     at java.lang.reflect.Method.invokeNative(Native Method)
12-18 03:20:45.447: W/System.err(2790):     at java.lang.reflect.Method.invoke(Method.java:525)
12-18 03:20:45.447: W/System.err(2790):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
12-18 03:20:45.447: W/System.err(2790):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-18 03:20:45.447: W/System.err(2790):     at dalvik.system.NativeStart.main(Native Method)
12-18 03:20:45.447: D/dalvikvm(2790): GC_FOR_ALLOC freed 5131K, 55% free 4437K/9672K, paused 2ms, total 2ms

消息是一个数组，那么它的代码应该是什么或如何解决？

谢谢 在 进步 。 . .

Answer 1

org.json.JSONException: Value response of type java.lang.String cannot be converted to JSONArray

看起来响应是一个字符串而不是一个 json 数组

{  // json object node 
    "response": { // json object response
        "result": 1,
        "Message": [ // json array Message
            {        // json object node 
                "pollid": "98",
                 "category": "Entertainment",
                 "question": "what",  //  string
                 "option1": "981.mov",

结果是一个json对象而不是json数组

JSONArray jsonArray = new JSONArray(result);

应该是

JSONObject jObj = new JSONObject(result);
JSONObject response = jObj.getJSONObject("response");
//JSONObject jb = new JSONObject(response);
JSONArray jr = response.getJSONArray("Message");
for(int i=0;i<jr.length();i++)
{
JSONObject jb1 = jr.getJSONObject(i);
String question = jb1.getString("question");
Log.i(".......",question);
}

Answer 2

Result 不是数组，Message 是。

Answer 3

试试这个：

Log.i("result", result);
try {
    if (result != null) {
        JSONObject jObject = new JSONObject(result);
        JSONArray jsonArray = jObject.getJSONObject("response").getJSONArray("Message");
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject objJson = jsonArray.getJSONObject(i);

            TopTenGetterSetter obj = new TopTenGetterSetter();  
            /*
             * [{"job_id":"1","job_staff_id":"","job_name":"Account",
             * "job_detail":"test\r\ntesds","job_start_date":
             * "2013-11-08"
             * ,"job_end_date":"2013-11-10","job_amount":"500"
             * ,"job_progress":"","job_complete_status":"0"}]
             */

            obj.setQ(objJson.getString("question"));
            obj.setA(objJson.getString("option1"));
            obj.setB(objJson.getString("option2"));
            obj.setC(objJson.getString("option3"));
            obj.setD(objJson.getString("option4"));

            polls.add(obj);
            // am = Customer.info.get(pos).getJamount();

            // Toast.makeText(getApplicationContext(), am + result,
            // Toast.LENGTH_LONG).show();
        }

    }
} catch (JSONException e) {
    e.printStackTrace();
    Toast.makeText(getApplicationContext(), "error",
            Toast.LENGTH_SHORT).show();
}

正如 mario 和 nfear 所说，您正在尝试将 JSONObject 转换为 JSONArray。

Answer 4

字符串内容 JSONObject 作为根元素而不是 JSONArray。要从 String 中获取 Message JSONArray，您应该首先获取 response JSONObject，然后将 Message JSONArray 获取为：

 JSONObject jsonobj = new JSONObject(result);
 // get response JSONObject

 JSONObject jsonobj_response = jsonobj.getJSONObject("response");

// get Message JSONArray from jsonobj_response

 JSONArray jsonArray = jsonobj_response.getJSONArray("Message");
  // your code here.....

Answer 5

试试这个，

try {
    if (result != null) {
        JSONArray jsonArray = new JSONObject(result).getJSONObject("response").getJSONArray("Message");
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject objJson = jsonArray.getJSONObject(i);

            TopTenGetterSetter obj = new TopTenGetterSetter();  
            /*
             * [{"job_id":"1","job_staff_id":"","job_name":"Account",
             * "job_detail":"test\r\ntesds","job_start_date":
             * "2013-11-08"
             * ,"job_end_date":"2013-11-10","job_amount":"500"
             * ,"job_progress":"","job_complete_status":"0"}]
             */

            obj.setQ(objJson.getString("question"));
            obj.setA(objJson.getString("option1"));
            obj.setB(objJson.getString("option2"));
            obj.setC(objJson.getString("option3"));
            obj.setD(objJson.getString("option4"));

            polls.add(obj);
            // am = Customer.info.get(pos).getJamount();

            // Toast.makeText(getApplicationContext(), am + result,
            // Toast.LENGTH_LONG).show();
        }

    }
} 

Answer 6

您发布的 JSON 有

// Key "response" , Value type JsonObject

 JSONObject jsonObject=jsonObjectOfRsponse.getJsonObject(key);

//Key "Message" , Value type Json Array

 JSONArray jsonArray=jsonObject.getJsonArray(key);

得到jsonArray后，循环使用this，根据里面的value类型解析Json。

所以检查你是否根据它所持有的值的类型来解析 json。

Answer 7

Value response of type java.lang.String cannot be converted to JSONArray

您正在尝试将单个对象转换为数组。

Answer 8

最好使用 GSON 库而不是手动解析它。 GSON 你可以在 goggling 上找到它。并给出了示例。