Android JSON Parse 在数组中获取数组

Question

似乎是一个简单的问题，我知道已经有多个这样的问题。我正在尝试从数组中的数组获取 JSON 数据。

我有一个 JSON 数组如下：

{
"results": [
    {
        "name": "John Doe",
        "time": "09:00:00",
        "claim": {
            "date": "2015-08-06",
            "comments": "Some comments"
        }
    },
    {
        "name": "Mary Smith",
        "time": "10:00:00",
        "claim": {
            "date": "2015-08-06",
            "comments": "Some comments"
        }
        }
    }
]
}

我正在尝试从中解析出所有信息，我能够获取name 和time，但我无法从claim 数组中获取数据。

我在 SO 上查看了多个类似的问题，但他们的解决方案都没有解决我的问题。

这是我的 Java 代码：

@Override
    protected void onPostExecute(JSONObject json) {
        if (dialog.isShowing()) {
            dialog.dismiss();
        }
        try {
            // Getting JSON Array from URL
            JSONArray android = json.getJSONArray(TAG_RESULTS);
            for (int i = 0; i < android.length(); i++) {
                JSONObject c = android.getJSONObject(i);

                // Storing  JSON items in Variables
                String time = c.getString(TAG_TIME);

                //For loop for claims array:
                JSONArray claims = c.getJSONArray(TAG_CLAIM);
                for (int j = 0; j < claims.length(); j++) {
                    JSONObject d = claims.getJSONObject(j);
                    String name = d.getString(TAG_NAME);
                 //other parsing and list view.

我收到此错误：

org.json.JSONException: Value {"date": "2015-08-06","comments": "Some comments"} at claim of type org.json.JSONObject cannot be converted to JSONArray
08-06 12:43:27.436  17586-17586/com.murrion.navigationdrawer W/System.err﹕ at org.json.JSON.typeMismatch(JSON.java:100)
08-06 12:43:27.436  17586-17586/com.murrion.navigationdrawer W/System.err﹕ at org.json.JSONObject.getJSONArray(JSONObject.java:588)

在这条线上：JSONArray claims = c.getJSONArray(TAG_CLAIM);

我不确定出了什么问题，我非常感谢一些帮助。谢谢

Answer 1

claim 不是数组，而是另一个对象。如果你希望它是一个数组，它应该是这样的：

    "claim": [
        "date": "2015-08-06",
        "comments": "Some comments"
    ]

（注意[ ] 而不是{ }）

如果它是一个对象，那么代码应该是：

            JSONObject claims = c.getJSONObject(TAG_CLAIM);

Answer 2

试试这个

{
"results": [
    {
        "name": "John Doe",
        "time": "09:00:00",
        "claim": [

            "date": "2015-08-06",
            "comments": "Some comments"
        ]
    },
    {
        "name": "Mary Smith",
        "time": "10:00:00",
        "claim": [
            "date": "2015-08-06",
            "comments": "Some comments"
        ]

    }
]
}

注意：错误堆栈跟踪中明确提到了您的 json 中的问题，它告诉您正在尝试将 json 对象（在 {...} 内）解析为json 数组（数组应该在 [...] 内，而不是 {...}）。所以请尝试阅读堆栈跟踪。

Answer 3

去掉多余的}花括号后你的json会是这样的

   {
        "results" :
        [
            {
                "name" : "John Doe",
                "time" : "09:00:00",
                "claim" : 
                {
                    "date" : "2015-08-06",
                    "comments" : "Some comments"
                }
            }, 
            {
                "name" : "Mary Smith",
                "time" : "10:00:00",
                "claim" : 
                {
                    "date" : "2015-08-06",
                    "comments" : "Some comments"
                }
            }
        ]
    }
and to parse this json your code like this
@Override
protected void onPostExecute(JSONObject json) 
{
        if (dialog.isShowing()) {
            dialog.dismiss();
        }
        try 
        {
            // Getting JSON Array from URL
            JSONArray android = json.getJSONArray(TAG_RESULTS);
            for (int i = 0; i < android.length(); i++){
                JSONObject c = android.getJSONObject(i);    
                // Storing  JSON items in Variables
                String time = c.getString(TAG_TIME);
                String time = c.getString("name");    
                //  for claims  object:
                JSONObject claims = c.getJSONObject(TAG_CLAIM);
                    String date= claims .getString("date");
                    String comments= claims .getString("comments");
                 //other parsing and list view.
             }
         }
         catch(Exception e){}
}

正如你所说，你的 json 应该是这样的

{
    "results" :
    [{
            "name" : "John Doe",
            "time" : "09:00:00",
            "claim" : [{
                    "date" : "2015-08-06",
                    "comments" : "Some comments"
                }
            ]
        }, {
            "name" : "Mary Smith",
            "time" : "10:00:00",
            "claim" : [{
                    "date" : "2015-08-06",
                    "comments" : "Some comments"
                }
            ]
        }
    ]
}

你的代码是这样的

@Override
    protected void onPostExecute(JSONObject json) 
    {
            if (dialog.isShowing()) {
                dialog.dismiss();
            }
            try 
            {
                // Getting JSON Array from URL
                JSONArray android = json.getJSONArray(TAG_RESULTS);
                for (int i = 0; i < android.length(); i++){
                    JSONObject c = android.getJSONObject(i);    
                    // Storing  JSON items in Variables
                    String time = c.getString(TAG_TIME);
                    String time = c.getString("name");    
                    //  for claims  object:
                    JSONArray claims = c.getJSONArray(TAG_CLAIM);
                    for (int j = 0; j < claims.length(); j++) {
                       JSONObject d = claims.getJSONObject(j);
                        String date= d.getString("date");
                        String comments= d.getString("comments");
                     //other parsing and list view.
                     }
                 }
             }
             catch(Exception e){}
    }