Question

在此代码中，传递给json时TextView字段不能具有任何值，并且警告是无法将json对象转换为json数组

String json = strListingsDetails;

        try {
            JSONArray jsonArray = new JSONArray(json);
            JSONObject jsonObject = new JSONObject(jsonArray.getJSONObject(0).toString());
            JSONArray dataListArray = jsonObject.getJSONArray("DataList");

            if (dataListArray != null && dataListArray.length() != 0) {

                for (int i = 0; i < dataListArray.length(); i++) {
                    JSONObject jsonObject1 = dataListArray.getJSONObject(i);

                    String listingId = jsonObject1.getString("ListingID");
                    String specification = jsonObject1.getString("Specifications");
                    String description = jsonObject1.getString("Description");
                    String manufacturer = jsonObject1.getString("Manufacturer");
                    String brand = jsonObject1.getString("Brand");
                    String machineType = jsonObject1.getString("ManchineType");
                    String condition = jsonObject1.getString("Condition");
                    String yearOfMfg = jsonObject1.getString("YearofMfg");
                    String Price=jsonObject1.getString("Price");
                    String ShowPrice=jsonObject1.getString("ShowPrice");
                    String country = jsonObject1.getString("Country");
                    String state = jsonObject1.getString("State");
                    String city = jsonObject1.getString("City");
                    String qty = jsonObject1.getString("Qty");
                    String height = jsonObject1.getString("Height");
                    String width = jsonObject1.getString("Width");
                    String length = jsonObject1.getString("Length");
                    String weight = jsonObject1.getString("Weight");
                    String warranty = jsonObject1.getString("Warranty");
                    String expiredOn = jsonObject1.getString("ExpiredOn");

Answer 1

无法将json对象转换为json数组

您正在尝试解析JSON字符串，它是JSON对象而不是数组

尝试这样。

JSONObject jsonObject = new JSONObject(json);
JSONArray dataListArray = jsonObject.getJSONArray("DataList");

Answer 2

请按照我的猜测匹配您的json：

[
{
    "DataList": [
        {
            "ListingID": "value",
            "Specifications": "value",
            "Description": "value",
            "Manufacturer": "value",
            "Brand": "value"
             ...
        }
    ]
}
]

记录您的json，您将找到答案

为什么此代码未在TextView中返回任何值，所以无法从json获取任何值

2 个答案: