java - 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。我正在尝试尝试访问此 JSON 对象中的位置。我使用后得到这个

 InputStream instream = entity.getContent();

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

Google 文档说它返回一个数组，但带有大括号，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 double 值。

我进行了搜索，但似乎只找到了有关简单文件的帮助。

{
   "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 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());

这应该为您提供东北地区的纬度/经度双倍。东南是一样的，只是将东北替换为东南。