Question

我有来自谷歌地图的以下JSON响应。我给了两个邮政编码作为开始和目的地。它描述了响应中的路由，以便部分正常工作。我想从响应中获取经度和纬度，以便我可以加载相应的地图。我遇到的问题是“东北”属性无法找到，有什么想法吗？

02-05 18:50:03.668: E/*********HelloviewActivity(10381): response code OK 
02-05 18:50:03.673: E/*********HelloviewActivity(10381): {
02-05 18:50:03.673: E/*********HelloviewActivity(10381):    "routes" : [
02-05 18:50:03.673: E/*********HelloviewActivity(10381):       {
02-05 18:50:03.673: E/*********HelloviewActivity(10381):          "bounds" : {
02-05 18:50:03.673: E/*********HelloviewActivity(10381):             "northeast" : {
02-05 18:50:03.678: E/*********HelloviewActivity(10381):                "lat" : 53.654430,
02-05 18:50:03.678: E/*********HelloviewActivity(10381):                "lng" : -1.778250
02-05 18:50:03.678: E/*********HelloviewActivity(10381):             },
02-05 18:50:03.678: E/*********HelloviewActivity(10381):             "southwest" : {
02-05 18:50:03.683: E/*********HelloviewActivity(10381):                "lat" : 53.62041000000001,
02-05 18:50:03.683: E/*********HelloviewActivity(10381):                "lng" : -1.831710
02-05 18:50:03.683: E/*********HelloviewActivity(10381):             }
02-05 18:50:03.683: E/*********HelloviewActivity(10381):          },

String jsonOutput = response.toString();
      //  Log.e(TAG,"jsonOutput = " + jsonOutput);

        JSONObject results = null;
        try {

            results = new JSONObject(jsonOutput);


            routes = results.getJSONArray("routes");


            bounds = routes.getJSONObject(0);

            northeast = bounds.getJSONObject("northeast");


             lat = Double.parseDouble((String) northeast.get("lat"));


             lon = Double.parseDouble((String) northeast.get("lng"));

        } catch (NumberFormatException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Log.e(TAG, "lon/lat = "+lon +" "+lat);

02-05 18:50:04.668: W/System.err(10381): org.json.JSONException: JSONObject["northeast"] not found.

Answer 1

routes是包含 bounds对象的（匿名）对象数组。

anonObject = routes.getJSONObject(0);
bounds = anonObject.getJSONObject("bounds");

修改：此外 - 一旦获得bounds对象; lat和lng不是String s - 它们已经Double s - 您没有进行任何转换：

lat = bounds.getDouble("lat");
lon = bounds.getDouble("lng");

无法从JSON输出获取lat / lng值

1 个答案: