javascript Android - 如何解析 JSONObject 和 JSONArrays
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/6350540/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Android - How to parse JSONObject and JSONArrays
提问by Chris Urquhart
My build is Android 2.2 Google API 8 , Im running from the emulator. I am trying try access Location long in this JSON Object. I get this after I use
我的版本是 Android 2.2 Google API 8 ，我从模拟器运行。我正在尝试在此 JSON 对象中尝试访问 Location long。我使用后得到这个
InputStream instream = entity.getContent();
JSONObject myAwway = new JSONObject(convertStreamToString(instream));
Google docs says it returns an array but with the surrounding curly braces It looks like an object.
谷歌文档说它返回一个数组，但周围有花括号它看起来像一个对象。
I need to access lat and lon in the location field and store as doubles.
我需要在 location 字段中访问 lat 和 lon 并存储为双打。
Ive searched but only seem to find help with simple files.
我已经搜索过，但似乎只能找到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"
}
回答by citizen conn
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());
That should give you lat/lng for northeast as doubles. Southeast is the same just replace northeast for southeast.
这应该给你东北的纬度/经度作为双打。东南也一样，只是把东北换成了东南。
回答by nicholas.hauschild
JSONObject location = myAwway.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location");
double lat = location.getDouble("lat");
double lng = location.getDouble("lng");
The 'results' JSONArray is probably the array Google docs suggested. They had just wrapped it up in a JSONObject with a status, so that you could check the status before attempting to work on the returned value.
“结果” JSONArray 可能是 Google 文档建议的数组。他们刚刚将它包装在一个带有状态的 JSONObject 中，以便您可以在尝试处理返回值之前检查状态。
