Android - 如何从字符串中解析 JsonArray？

Question

我试图从 json 字符串解析一个 json 数组，但它总是抛出异常 data of type java.lang.String cannot be converted to JSONArray。

如果我有任何错误，请告诉我。

谢谢。

这是我从服务器获取 Json 的代码:

try {
                String url = String.format(<url here>, province.provinceCode2);
                HttpClient httpClient = getHttpClient();
                HttpGet httpGet = new HttpGet(url);
                HttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity entity = httpResponse.getEntity();
                final String result = EntityUtils.toString(entity);
                parseAndSaveJsonData(province, result);
            } catch (Exception e) {
                e.printStackTrace();
            }

这里是解析 JsonArray 的代码:

String jsonString = <below json string>
JSONArray ja = new JSONArray(jsonString);

这是我的 json 字符串:

   [
   {
      "LotPrizes":[
         {
            "Prize":"Giảitám",
            "Range":"50"
         },
         {
            "Prize":"Giảibảy",
            "Range":"264"
         },
         {
            "Prize":"Giảisáu",
            "Range":"3654-5162-3097"
         },
         {
            "Prize":"Giảinăm",
            "Range":"9739"
         },
         {
            "Prize":"Giảitư",
            "Range":"97690-99274-32442-69432-04855-10132-17085"
         },
         {
            "Prize":"Giảiba",
            "Range":"73745-13007"
         },
         {
            "Prize":"Giảinhì",
            "Range":"05521"
         },
         {
            "Prize":"Giảinhất",
            "Range":"74870"
         },
         {
            "Prize":"GiảiDB6",
            "Range":"878833"
         }
      ]
      },
 {
      "LotPrizes":[
         {
            "Prize":"Giảitám",
            "Range":"50"
         },
         {
            "Prize":"Giảibảy",
            "Range":"264"
         },
         {
            "Prize":"Giảisáu",
            "Range":"3654-5162-3097"
         },
         {
            "Prize":"Giảinăm",
            "Range":"9739"
         },
         {
            "Prize":"Giảitư",
            "Range":"97690-99274-32442-69432-04855-10132-17085"
         },
         {
            "Prize":"Giảiba",
            "Range":"73745-13007"
         },
         {
            "Prize":"Giảinhì",
            "Range":"05521"
         },
         {
            "Prize":"Giảinhất",
            "Range":"74870"
         },
         {
            "Prize":"GiảiDB6",
            "Range":"878833"
         }
      ]
      }

    ]

Answer 1

这是初始化 JSON 解析器的方法:

JSONObject jsonObject = new JSONObject(jsonString);

这将为您提供整个字符串作为 Json 对象。从那里，拉出一个单独的数组作为 JsonArray，如下所示:

JSONArray jsonArray = jsonObject.getJSONArray("LotPrizes");

要访问每个“LotPrizes”，您可以使用循环逻辑:

for(int i=0;i<jsonArray.length();i++)
{
  JSONObject curr = jsonArray.getJSONObject(i);

  prize = curr.getString("Prize")

//Do stuff with the Prize String here
//Add it to a list, print it out, etc.
}

编辑:JSON 编辑后的最终代码:

JSONArray jsonArray = null;
String jsonString = <your string>
String currPrize = null;

JSONObject jsonObject = new JSONObject(jsonString);

jsonArray = jsonObject.getJSONArray("data");

for(int i=0;i<jsonArray.length();i++)
{
    JSONArray currLot = jsonArray.getJSONObject(i);

    for(int j=0; j<currLot.length();j++)
    {
        JSONobject curr = currLot.getJSONObject(j);

        currPrize = curr.getString("Prize");

        //Do something with Prize
    }
}

这段代码是有效的，我在我的代码中使用了几乎相同的版本。希望这(最终)对您有用。