Android应用中如何解析获取的json数据

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第一步:根据指定的URL从google 服务器上获得包含地址的json格式的数据(其还提供xml格式的,但json解析效率比xml高)

private static StringBuffer getJSONData(String urlPath){
    try {
      URL url = new URL(urlPath);
      HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
      httpURLConnection.setReadTimeout(5000);
      httpURLConnection.setRequestMethod("GET");
      if(httpURLConnection.getResponseCode() == 200){
        InputStream inputStream = httpURLConnection.getInputStream();
        InputStreamReader isr = new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(isr);
        String temp = null;
        StringBuffer jsonsb = new StringBuffer();
        while((temp = br.readLine()) != null){
          jsonsb.append(temp);
        }
        return jsonsb;
      }
    } catch (MalformedURLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return null;
}

传入经纬度作为参数

/**
* 根据经纬度获得地址
* @param latitude
* @param longitude
* @return
*/
public static StringBuffer getCurrentAddressByGPS(long latitude,long longitude){
    StringBuffer stringBuffer = new StringBuffer();
    stringBuffer.append(GOOGLE_GPS_PREFIX).append(latitude).append(",")
      .append(longitude).append(GOOGLE_GPS_SUFFIX);
    return getJSONData(stringBuffer.toString());
}

第三,解析json数据:

public static boolean parseAddressJSON(StringBuffer sb){
    try {
      if(sb != null){
        JSONObject jsonAllData = new JSONObject(sb.toString());
        /**
         * 获得一个长度为1的JSON数组,如:[{数据内容}]
         */
        String placemarkStr = jsonAllData.getString("Placemark");
        /**
         * 将placemarkStr数组类型字符串构造成一个JSONArray对象
         */
        JSONArray placemarkArray = new JSONArray(placemarkStr);
        /**
         * Placemark标签内容是一个长度为1的数组,获得数组的内容并转换成字符串
         */
        String jsonDataPlacemarkStr = placemarkArray.get(0).toString();
        /**
         * 对上面得到的JSON数据类型的字符串(jsonDataPlacemarkStr)进行解析
         */
        JSONObject jsonDataPlacemark = new JSONObject(jsonDataPlacemarkStr);
        /**
         * 获得标签AddressDetails的JSON数据
         */
        String jsonAddressDetails = jsonDataPlacemark.getString("AddressDetails");
        /**
         * 对上面得到的JSON数据类型的字符串(jsonAddressDetails)进行解析
         */
        JSONObject jsonDataAddressJDetails = new JSONObject(jsonAddressDetails);
        /**
         * 获得标签Country的JSON数据
         */
        String jsonCountry = jsonDataAddressJDetails.getString("Country");
        /**
         * 对上面得到的JSON数据类型的字符串(jsonCountry)进行解析
         */
        JSONObject jsonDataCountry = new JSONObject(jsonCountry);
        /**
         * 对解析出来的感兴趣的数据进行封装
         */
        LewatekGPSAddress lewatekGPSAddress = new LewatekGPSAddress();
        /**
         * 设置CountryName
         */
        lewatekGPSAddress.setCountryName(jsonDataCountry.getString("CountryName"));
        /**
         * 设置CountryNameCode
         */
        lewatekGPSAddress.setCountryNameCode(jsonDataCountry.getString("CountryNameCode"));
        /**
         * 获得标签AdministrativeArea的JSON数据
         */
        String jsonAdministrativeArea = jsonDataCountry.getString("AdministrativeArea");
        /**
         * 对上面得到的JSON数据类型的字符串(jsonAdministrativeArea)进行解析
         */
        JSONObject jsonDataAdministrativeArea = new JSONObject(jsonAdministrativeArea);
        /**
         * 设置AdministrativeAreaName
         */
        lewatekGPSAddress.setAdministrativeAreaName(jsonDataAdministrativeArea.getString("AdministrativeAreaName"));
        /**
         * 获得标签Locality的JSON数据
         */
        String jsonLocality = jsonDataAdministrativeArea.getString("Locality");
        /**
         * 对上面得到的JSON数据类型的字符串(jsonLocality)进行解析
         */
        JSONObject jsonDataLocality = new JSONObject(jsonLocality);
        /**
         * 设置LocalityName
         */
        lewatekGPSAddress.setLocalityName(jsonDataLocality.getString("LocalityName"));
        /**
         * 获得标签DependentLocality的JSON数据
         */
        String jsonDependentLocality = jsonDataLocality.getString("DependentLocality");
        /**
         * 对上面得到的JSON数据类型的字符串(jsonDependentLocality)进行解析
         */
        JSONObject jsonDataDependentLocality = new JSONObject(jsonDependentLocality);
        lewatekGPSAddress.setDependentLocalityName(jsonDataDependentLocality.getString("DependentLocalityName"));
        Log.e(TAG,lewatekGPSAddress.toString());
        return true;
      }
    } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return false;
}

从google服务器上获得的json数据(提取对我有用的数据:CountryName、LocalityName、AdministrativeAreaName、DependentLocalityName,即中国上海市上海市浦东新区(中国湖南省衡阳市衡山县这样的数据也能提取)):

{
 "name": "31.20322202833381,121.59876351250254",
 "Status": {
  "code": 200,
  "request": "geocode"
 },
 "Placemark": [ {
  "id": "p1",
  "address": "中国上海市浦东新区祖冲之路994号-1088号",
  "AddressDetails": {
  "Accuracy" : 8,
  "Country" : {
   "AdministrativeArea" : {
     "AdministrativeAreaName" : "上海市",
     "Locality" : {
      "DependentLocality" : {
        "DependentLocalityName" : "浦东新区",
        "Thoroughfare" : {
         "ThoroughfareName" : "祖冲之路994号-1088号"
        }
      },
      "LocalityName" : "上海市"
     }
   },
   "CountryName" : "中国",
   "CountryNameCode" : "CN"
  }
},
  "ExtendedData": {
   "LatLonBox": {
    "north": 31.2070152,
    "south": 31.2007199,
    "east": 121.6018752,
    "west": 121.5955799
   }
  },
  "Point": {
   "coordinates": [ 121.5986103, 31.2038252, 0 ]
  }
 } ]
}
Value [{"id":"p1","ExtendedData":{"LatLonBox":{"south":31.2007199,"west":121.5955799,"east":121.6018752,"north":31.2070152}},"address":"中国上海市浦东新区祖冲之路994号-1088号","Point":{"coordinates":[121.5986103,31.2038252,0]},"AddressDetails":{"Country":{"CountryNameCode":"CN","CountryName":"中国","AdministrativeArea":{"Locality":{"LocalityName":"上海市","DependentLocality":{"DependentLocalityName":"浦东新区","Thoroughfare":{"ThoroughfareName":"祖冲之路994号-1088号"}}},"AdministrativeAreaName":"上海市"}},"Accuracy":8}}] at Placemark of type org.json.JSONArray cannot be converted to JSONObject

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