来自谷歌购物api的Android JSON解析错误

Question

上周我决定尝试使用Google购物API，但我不知道如何解析JCON对象。

在这里搜索了很多之后，我得到了一件商品的产品信息！然而，我不能把范围缩小到产品中的一个字符串。例如，我只想得到一个产品的标题。

我有以下内容：

jsonString:

{
 "kind": "shopping#products",
 "etag": ""GKsxsRlaBDslDpMe-MT1O7wqUDE/dMvQ5Pu2C806fWZJbNJ0GjdesJs"",
 "id": "tag:google.com,2010:shopping/products",
 "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products?country=US&restrictBy=gtin:051500240908&startIndex=1&maxResults=25",
 "totalItems": 3,
 "startIndex": 1,
 "itemsPerPage": 25,
 "currentItemCount": 3,
 "items": [
  {
   "kind": "shopping#product",
   "id": "tag:google.com,2010:shopping/products/7585088/9884865157760252836",
   "selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/7585088/gid/9884865157760252836",
   "product": {
    "googleId": "9884865157760252836",
    "author": {
     "name": "Southeastern Delivery",
     "accountId": "7585088"
    },
    "creationTime": "2011-07-25T00:15:58.000Z",
    "modificationTime": "2012-02-11T09:29:00.000Z",
    "country": "US",
    "language": "en",
    "title": "Jif Peanut Butter, Creamy",
    "description": "Jif Creamy Peanut Butter. Fresh Roasted Peanut Taste. Look for the flavor seal. Contains no preservatives. No refrigeration required.",
    "link": "http://www.southeasterndelivery.com/Jif_Peanut_Butter_00051500240908/",
    "brand": "Jif Peanut Butter",
    "condition": "new",
    "gtin": "00051500240908",
    "gtins": [
     "00051500240908"
    ],
    "inventories": [
     {
      "channel": "online",
      "availability": "inStock",
      "price": 15.64,
      "shipping": 1.56,
      "currency": "USD"
     }
    ],
    "images": [
     {
      "link": "http://www.southeasterndelivery.com/images/ProductImages/00051500240908.jpg"
     }
    ]
   }
  },
 ],
 "requestId": "0CLGzkcKVo64CFRDd5wod4mMAAA"
 }

我在我的android应用程序中有以下代码来解析它：

try {
    JSONObject jsonObject = new JSONObject(jsonString);
    JSONArray itemsArray = jsonObject.getJSONArray("items");
    JSONObject productObject = itemsArray.getJSONObject(0);
    //String productTitle = productObject.getString("title");
    //tv.setText(productTitle);
    tv.setText(productObject.toString());
} catch (JSONException e) {
    // TODO Auto-generated catch block
    tv.setText("JSONOBJECT Error: " + e);
    e.printStackTrace();
}
setContentView(tv);

我的Android应用程序上的TextView现在将显示（显然没有缩进，我这样做是为了便于阅读）：

   "product": {
    "googleId": "9884865157760252836",
    "author": {
     "name": "Southeastern Delivery",
     "accountId": "7585088"
    },
    "creationTime": "2011-07-25T00:15:58.000Z",
    "modificationTime": "2012-02-11T09:29:00.000Z",
    "country": "US",
    "language": "en",
    "title": "Jif Peanut Butter, Creamy",
    "description": "Jif Creamy Peanut Butter. Fresh Roasted Peanut Taste. Look for the flavor seal. Contains no preservatives. No refrigeration required.",
    "link": "http://www.southeasterndelivery.com/Jif_Peanut_Butter_00051500240908/",
    "brand": "Jif Peanut Butter",
    "condition": "new",
    "gtin": "00051500240908",
    "gtins": [
     "00051500240908"
    ],
    "inventories": [
     {
      "channel": "online",
      "availability": "inStock",
      "price": 15.64,
      "shipping": 1.56,
      "currency": "USD"
     }
    ],
    "images": [
     {
      "link": "http://www.southeasterndelivery.com/images/ProductImages/00051500240908.jpg"
     }
    ]
   }

现在，如果您注意到我的Java代码中有两行注释掉了。如果我取消注释这些行，然后注释该行：

tv.setText(productObject.toString());

tv被设置为这个错误："JSONOBECT错误：org.json.JSONception:标题没有值"。我不知道为什么这是真的，因为它们显然是productObject中的一个标题。

任何帮助都会很棒！

Answer 1

我在项目中使用json智能。它很小，速度也很快。要将JSON从Sting转换为实际对象，请使用JSONObjet json = (JSONObject)JSONValue.parse(rawString);

当您拥有JSONObject时，您将其视为一个Map。因此String title = (String) json.get("title")

Answer 2

您的代码中缺少一定级别的信息。JSON数组包含项，其中包含products并具有标题。

你的代码应该看起来像：

JSONObject jsonObject = new JSONObject(jsonString); 
JSONArray itemsArray = jsonObject.getJSONArray("items"); 
JSONObject itemObject = itemsArray.getJSONObject(0); 
JSONObject productObject = itemObject.getJSONObject("product");
String productTitle = productObject.getString("title");