Android - 如何解析JSONObject和JSONArrays

Question

我的版本是Android 2.2 Google API 8，我从模拟器运行。我尝试访问此JSON对象中的长访问位置。我使用后我得到这个

InputStream instream = entity.getContent(); 

JSONObject myAwway = new JSONObject(convertStreamToString(instream)); 

谷歌文档说，它返回一个数组，但与周围的大括号它看起来像一个对象。

我需要访问位置字段中的纬度和经度，并存储为双打。

我已经搜索，但似乎只能找到简单文件的帮助。

{ 
    "results" : [ 
     { 
     "address_components" : [ 
      { 
       "long_name" : "20059", 
       "short_name" : "20059", 
       "types" : [ "postal_code" ] 
      }, 
      { 
       "long_name" : "Washington D.C.", 
       "short_name" : "Washington D.C.", 
       "types" : [ "locality", "political" ] 
      }, 
      { 
       "long_name" : "District of Columbia", 
       "short_name" : "DC", 
       "types" : [ "administrative_area_level_1", "political" ] 
      }, 
      { 
       "long_name" : "United States", 
       "short_name" : "US", 
       "types" : [ "country", "political" ] 
      } 
     ], 
     "formatted_address" : "Washington D.C., DC 20059, USA", 
     "geometry" : { 
      "bounds" : { 
       "northeast" : { 
        "lat" : 38.924920, 
        "lng" : -77.0178720 
       }, 
       "southwest" : { 
        "lat" : 38.9189910, 
        "lng" : -77.02261200000001 
       } 
      }, 
      "location" : { 
       "lat" : 38.92177780, 
       "lng" : -77.01974260 
      }, 
      "location_type" : "APPROXIMATE", 
      "viewport" : { 
       "northeast" : { 
        "lat" : 38.92510312068017, 
        "lng" : -77.01709437931984 
       }, 
       "southwest" : { 
        "lat" : 38.91880787931983, 
        "lng" : -77.02338962068018 
       } 
      } 
     }, 
     "types" : [ "postal_code" ] 
     } 
    ], 
    "status" : "OK" 
} 

Answer 1

JSONObject location = myAwway.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location"); 
double lat = location.getDouble("lat"); 
double lng = location.getDouble("lng"); 

'results'JSONArray可能是Google文档建议的数组。他们刚刚将它封装在带有状态的JSONObject中，以便在尝试处理返回的值之前检查状态。

Answer 2

JSONObject jObject = new JSONObject(convertStreamToString(instream)); 
JSONArray results = jObject.getJSONArray("result"); 
JSONObject geometry = results.getJSONObject(2); 
JSONObject bounds = geometry.getJSONObject("bounds"); 
JSONObject northeast = geometry.getJSONObject("northeast"); 

double nLat = Double.parseDouble(northeast.getString("lat").toString()); 
double nLng = Double.parseDouble(northeast.getString("lng").toString()); 

这应该给你纬度/经度为东北为双打。东南部同样只是东南部的东南部。