无法在Java中访问getJSONArray

Question

我有这个来自URL的Json：

{
  "type":"FeatureCollection",
  "features":
    [
      {
        "type":"Feature",
        "properties":
          [
            {
              "type":"colliers",
              "thumb":"upload\/estate\/135\/thumb_1. Prologis Park Wroclaw I.jpg",
              "name_pl":"Prologis Park Wroc\u0142aw I",
              "name_en":"Prologis Park Wroc\u0142aw I",
              "completearea":"167 000",
              "completeareaunit":"m2",
              "workingarea":"",
              "workingareaunit":"m2",
              "id_type":"3",
              "id":"135",
              "lon":16.939201369628,
              "lat":51.037378299619,
              "images":["public\/upload\/estate\/135\/1. Prologis Park Wroclaw I.jpg"]
            }
          ],
        "geometry":
          {
            "type":"Point",
            "coordinates":[16.939201369628,51.037378299619]
          },
        "crs":
          {
            "type":"name",
            "properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}
          }
        },

      {
        "type":"Feature",
        "properties":
          [
            {
              "type":"colliers",
              "thumb":"upload\/estate\/136\/thumb_2. Prologis Park Wroclaw III.jpg",
              "name_pl":"Prologis Park Wroc\u0142aw III",
              "name_en":"Prologis Park Wroclaw III",
              "completearea":"129 500",
              "completeareaunit":"m2",
              "workingarea":"",
              "workingareaunit":"m2",
              "id_type":"3",
              "id":"136",
              "lon":16.928386702881,
              "lat":51.105440250407,
              "images":
                [
                  "public\/upload\/estate\/136\/2. Prologis Park Wroclaw III.jpg"
                ]
            }
          ],
        "geometry":
          {
            "type":"Point",
            "coordinates":[16.928386702881,51.105440250407]
          },
        "crs":
          {
            "type":"name",
            "properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}
          }
        },
        .................... more more more...

我需要把手放在列表中的属性上。

所以应该是功能->属性-> name_en（类似对象的列表）

我尝试这样：

JSONParser parser = new JSONParser();
Object obj = parser.parse(Json_str);    
JSONObject jsonObject = (JSONObject) obj;
JSONArray jsonFeaturesArr = new JSONArray(jsonObject.getJSONArray("features"));

为了创建第一个Json Array，但我什至无法做到。我收到错误消息：JSONObject类型的方法getJSONArray（String）未定义

（我对“ getJSONObject”有同样的错误）。一定是缺少的东西，我是Java / android新手。

如果我解决错误，该如何深入Json？

提前感谢帮助。

Answer 1

尝试为：

JSONObject jSONObject = new JSONObject(jsonString);
String str_type=jSONObject.getString("type");

// using JSONArray
JSONArray featuresArr = jSONObject.getJSONArray("features");
  for (int i=0; i<featuresArr.length; i++){
    JSONObject anotherjsonObject = featuresArr.getJSONObject(i);
    //access the fields of that json object
    String str_type_one=anotherjsonObject.getString("type");
   JSONArray featuresArr_properties = anotherjsonObject.getJSONArray("properties");

   JSONObject propertiesjsonObject = featuresArr_properties.getJSONObject(0);
   String str_type=propertiesjsonObject.getString("type");
   String str_type=propertiesjsonObject.getString("thumb");
   String str_type=propertiesjsonObject.getString("name_pl");
   String str_type=propertiesjsonObject.getString("name_en");
 ////parse all items ...........
  }