【发布时间】：2011-06-23 14:52:31
【问题描述】：
我正在尝试查找两个位置之间的距离。我有经度和纬度，我可以计算欧几里得距离。但我想找到道路距离。我的意思是，我想计算从源头到目的地的道路距离。在这种情况下如何计算呢？
【问题讨论】：
标签： android google-maps mobile distance latitude-longitude
【发布时间】：2011-06-23 14:52:31
【问题描述】：
最简单的方法是使用 Google Directions API 来获取路线，这会为您提供路线上所有点的列表（以及总距离）。
查看：http://code.google.com/apis/maps/documentation/directions/
如果您不确定如何执行此操作，请告诉我，我会为您发布一些代码，这些代码将从谷歌获取路线并提取您需要的数据。
更新 - 要求的代码
private void GetDistance(GeoPoint src, GeoPoint dest) {
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.googleapis.com/maps/api/directions/json?");
urlString.append("origin=");//from
urlString.append( Double.toString((double)src.getLatitudeE6() / 1E6));
urlString.append(",");
urlString.append( Double.toString((double)src.getLongitudeE6() / 1E6));
urlString.append("&destination=");//to
urlString.append( Double.toString((double)dest.getLatitudeE6() / 1E6));
urlString.append(",");
urlString.append( Double.toString((double)dest.getLongitudeE6() / 1E6));
urlString.append("&mode=walking&sensor=true");
Log.d("xxx","URL="+urlString.toString());
// get the JSON And parse it to get the directions data.
HttpURLConnection urlConnection= null;
URL url = null;
url = new URL(urlString.toString());
urlConnection=(HttpURLConnection)url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.connect();
InputStream inStream = urlConnection.getInputStream();
BufferedReader bReader = new BufferedReader(new InputStreamReader(inStream));
String temp, response = "";
while((temp = bReader.readLine()) != null){
//Parse data
response += temp;
}
//Close the reader, stream & connection
bReader.close();
inStream.close();
urlConnection.disconnect();
//Sortout JSONresponse
JSONObject object = (JSONObject) new JSONTokener(response).nextValue();
JSONArray array = object.getJSONArray("routes");
//Log.d("JSON","array: "+array.toString());
//Routes is a combination of objects and arrays
JSONObject routes = array.getJSONObject(0);
//Log.d("JSON","routes: "+routes.toString());
String summary = routes.getString("summary");
//Log.d("JSON","summary: "+summary);
JSONArray legs = routes.getJSONArray("legs");
//Log.d("JSON","legs: "+legs.toString());
JSONObject steps = legs.getJSONObject(0);
//Log.d("JSON","steps: "+steps.toString());
JSONObject distance = steps.getJSONObject("distance");
//Log.d("JSON","distance: "+distance.toString());
String sDistance = distance.getString("text");
int iDistance = distance.getInt("value");
}
这将返回两点之间的距离，您可以更改函数以将其返回为字符串或整数，只需返回 sDistance 或 iDistance。
希望对您有所帮助，如果您需要更多帮助，请告诉我。
【讨论】：
-
如果您只想要距离，Zhehao Mao 的答案可能会更好，这取决于您一旦有了距离想做什么，如果您想在地图上绘制路线，请使用 Directions API。
-
我检查了您发送的页面，我认为如果您可以发送一些代码部分，这对我来说会更好。所以你能发布一些代码吗？
-
我已将代码添加到我的原始答案中。顺便说一句，你不能像@Khepri 在 android 上说的那样做——不过会容易得多！
-
非常感谢您的帮助。它真的帮助了我。据我所知，方向api通过航路点给出和订购作为旅行推销员问题的响应。现在还有一个问题是，如何解析这个 json 文件。订单如何？我的意思是如果我将参数优化设置为true，结果如何？只有优化的结果？主要问题是如何解析？如果路由器阵列中有两条路由，这意味着什么？我认为腿是从一个地方到另一个地方的一个方向。但如果是，什么是路线？非常感谢您的帮助。
-
我尝试了您在上面发布的代码，但是在 Eclipse Android 中编译时收到以下错误：“JSONTokener cannot be resolve to a type”代码行：@ 987654323@“修复”之一是导入 JSONTokener(org.json)，但如果我这样做，则会引发一大堆其他错误，例如：“未处理的异常类型 IOException”代码：
inStream.close();不幸的是，我对 Android 和 Java 还很陌生，所以如果您能提供任何建议，我们将不胜感激！
使用谷歌地图距离矩阵 API http://code.google.com/apis/maps/documentation/distancematrix/。
【讨论】：
既然您已经在使用 google-maps，请查看the driving directions api。
（顺便说一句，Google Maps API v3？我假设是的）
对于一对纬度/经度点，您可以请求行车路线
在 API3 中它看起来像这样：
var directionsService = new google.maps.DirectionsService();
var start = from; // A Google LatLng point or an address,
// see their API for further details
var end = to; // A Google LatLng point or an address,
//see their API for further details
var request = {
origin: start,
destination: end,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function (response, status) {
//Check if status Ok
//Distance will be in response.routes[0].legs[0].distance.text
});
验证响应状态是否正常，然后确保存在路由集合。如果是这样，就会有结果，您可以通过以下方式访问“距离”文本元素：
response.routes[0].legs[0].distance.text
希望对您有所帮助。
【讨论】：
我看到有几个人回答正确，但请看一下这个答案。使用谷歌地图方向api非常有用的api。 Google Maps Direction Api usage
【讨论】：
肯尼改进的答案对我有用，我根据自己的需要修改了一些东西。由于引入了 LatLng 而不是地理点。我正在发布工作代码，它是肯尼答案的修改版本。所有功劳都归肯尼所有，而不是我！
重点：
以字符串格式传递地址。例如：多伦多
复制这个函数：
private void GetDistance(String src, String dest) {
String s = src.replaceAll("\\s","+");
String d = dest.replaceAll("\\s","+");
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.googleapis.com/maps/api/directions/json?");
urlString.append("origin=");
urlString.append((s));
urlString.append("&destination=");
urlString.append((d));
urlString.append("&mode=driving&sensor=true");
Log.d("xxx", "URL=" + urlString.toString());
// get the JSON And parse it to get the directions data.
HttpURLConnection urlConnection = null;
URL url = null;
try {
url = new URL(urlString.toString());
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.connect();
InputStream inStream = urlConnection.getInputStream();
BufferedReader bReader = new BufferedReader(new InputStreamReader(inStream));
String temp, response = "";
while ((temp = bReader.readLine()) != null) {
//Parse data
response += temp;
}
//Close the reader, stream & connection
bReader.close();
inStream.close();
urlConnection.disconnect();
//Sortout JSONresponse
JSONObject object = (JSONObject) new JSONTokener(response).nextValue();
JSONArray array = object.getJSONArray("routes");
Log.d("xxx", "array: " + array.toString());
//Routes is a combination of objects and arrays
JSONObject routes = array.getJSONObject(0);
Log.d("xxx", "routes: " + routes.toString());
//String summary = routes.getString("summary");
//Log.d("JSON","summary: "+summary);
JSONArray legs = routes.getJSONArray("legs");
Log.d("xxx", "legs: " + legs.toString());
JSONObject steps = legs.getJSONObject(0);
Log.d("JSON", "steps: " + steps.toString());
JSONObject distance = steps.getJSONObject("distance");
Log.d("xxx", "distance: " + distance.toString());
String sDistance = distance.getString("text");
int iDistance = distance.getInt("value");
Log.d("SEE THE DIST : ", "" + sDistance + iDistance);
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
}
由于该函数执行网络操作，我们必须按如下方式使用 AsyncTask：
private class Task extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
GetDistance(from, to);
return null;
}
}
日志猫：
01-05 17:01:08.657 3736-3820/in.test D/xxx: URL=http://maps.googleapis.com/maps/api/directions/json?origin=MP+Chowk+Thane+West+Thane,+Maharashtra+400080+&destination=Ghatkopar+West,+Mumbai,+Maharashtra,+India&mode=driving&sensor=true
01-05 17:01:08.687 3736-3736/in.test W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection
01-05 17:01:08.687 3736-3736/in.test W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection
01-05 17:01:08.797 3736-3778/in.test V/RenderScript: Application requested CPU execution
01-05 17:01:08.807 3736-3778/in.test V/RenderScript: 0xb97768c0 Launching thread(s), CPUs 4
01-05 17:01:09.097 3736-3820/in.test D/xxx: array: [{"bounds":{"northeast":{"lat":19.1885561,"lng":72.9686183},"southwest":{"lat":19.0842303,"lng":72.9075409}},"copyrights":"Map data ©2016 Google","legs":[{"distance":{"text":"15.8 km","value":15818},"duration":{"text":"26 mins","value":1562},"end_address":"Ghatkopar West, Mumbai, Maharashtra, India","end_location":{"lat":19.0908134,"lng":72.9076817},"start_address":"MP Chowk, Thane West, Thane, Maharashtra 400080, India","start_location":{"lat":19.1855772,"lng":72.9556247},"steps":[{"distance":{"text":"27 m","value":27},"duration":{"text":"1 min","value":6},"end_location":{"lat":19.185599,"lng":72.9558468},"html_instructions":"Head <b>northeast<\/b> on <b>MP Chowk<\/b> toward <b>SG Barve Rd<\/b>","polyline":{"points":"{dbtBsch|L?AA?AA?AA??AAAAA?A?A?AAA?A?A?A?A?A?A@A?A@A?A@A?A@A"},"start_location":{"lat":19.1855772,"lng":72.9556247},"travel_mode":"DRIVING"},{"distance":{"text":"0.9 km","value":870},"duration":{"text":"3 mins","value":165},"end_location":{"lat":19.1883648,"lng":72.963413},"html_instructions":"Exit the roundabout onto <b>Lal Bahadur Shastri Marg<\/b><div style=\"font-size:0.9em\">Pass by Wagle Estate Post Office (on the left)<\/div>","polyline":{"points":"_ebtBaeh|LWoAOcAEe@A_AA{AMcBEQC]COOqAk@sDcAaE_@_Ac@}@[o@o@aAk@w@k@w@e@{@s@{AWm@"},"start_location":{"lat":19.185599,"lng":72.9558468},"travel_mode":"DRIVING"},{"distance":{"text":"2.4 km","value":2448},"duration":{"text":"5 mins","value":316},"end_location":{"lat":19.16823,"lng":72.96618509999999},"html_instructions":"Turn <b>right<\/b> to merge onto <b>NH 3<\/b><div style=\"font-size:0.9em\">Partial toll road<\/div>","polyline":{"points":"gvbtBiti|LQYIOCEGKXEZGp@QvM}CnAWLCNCL?X?jFsAp@QlGaBt@Qh@Of@Mz@WXIRI`@MNGRKrB_AxCqAbCaAz@]^Mb@Mr@Ob@IbDg@v@O|B]XEvAW~@OLAPCN?Z?r@@tG^r@Df@F`@HzDt@lAZl@RrAr@bAn@vC`BtD~B"},"start_location":{"lat":19.1883648,"lng":72.963413},"travel_mode":"DRIVING"},{"distance":{"text":"5.6 km","value":5599},"duration":{"text":"5 mins","value":320},"end_location":{"lat":19.1249579,"lng":72.9390226},"html_instructions":"Keep <b>right<\/b> to stay on <b>NH 3<\/b><div style=\"font-size:0.9em\">Partial toll road<\/div>","maneuver":"keep-right","polyline":{"points":"mx~sBuej|LnEnCnElCXNXNtFhDtFhDnc@jW|AbAtL|GZPTN@@@?B@DD@?DB`@X@?rN|I|BtAb@T~X~NzNtHd_@vRhHtDNJh@ZrCzAh@XxAt@lAn@zo@l\\p@ZdCjA~Bz@fGjB"},"start_location":{"lat":19.16823,"lng":72.96618509999999},"travel_mode":"DRIVING"},{"distance":{"text":"1.5 km","value":1518},"duration":{"text":"2 mins","value":95},"end_location":{"lat":19.1122651,"lng":72.93371189999999},"html_instructions":"Keep <b>left<\/b> to stay on <b>NH 3<\/b>","maneuver":"keep-left","polyline":{"points":"_jvsB{{d|LtCt@v@VxAj@jKjDj@Pt`@zLrKfD~HhC"},"start_location":{"lat":19.1249579,"lng":72.9390226},"travel_mode":"DRIVING"},{"distance":{"text":"2.4 km","value":2371},"duration":{"text":"2 mins","value":139},"end_location":{"lat":19.0923682,"lng":72.9255933},"html_instructions":"Keep <b>right<\/b> to stay on <b>NH 3<\/b>","maneuver":"keep-right","polyline":{"points":"uzssBuzc|LrQlFd@Nd@N|XrInBn@zBp@vQpF`F|AjVpH~PfFzAh@"},"start_location":{"lat":19.1122651,"lng":72.93371189999999},"travel_mode":"DRIVING"},{"distance":{"text":"0.9 km","value":921},"duration":{"text":"1 min","value":54},"end_location":{"lat":19.0849757,"lng":72.9217895},"html_instructions":"Continue straight to stay on <b>NH 3<\/b>","maneuver":"straight","polyline":{"points":"i~osB}gb|LZJ|NlEXHTHn@R|@VvAb@tC~@b@NTHh@TB?TJNHZNTL`@T`@Vr@f@d@^`E~C"},"start_location":{"lat":19.0923682,"lng":72.9255933},"travel_mode":"DRIVING"},{"distance":{"text":"0.1 km","value":132},"duration":{"text":"1 min","value":18},"end_location":{"lat":19.0842303,"lng":72.92085449999999},"html_instructions":"Take the exit on the <b>right<\/b> toward <b>Link Rd<\/b>","maneuver":"ramp-right","polyline":{"points":"cpnsBepa|LBV@@@@rBlBDDBDDF@FFT"},"start_location":{"lat":19.0849757,"lng":72.9217895},"travel_mode":"DRIVING"},{"distance":{"text":"0.3 km","value":275},"duration":{"text":"1 min","value":47},"end_location":{"lat":19.0862782,"lng":72.9194201},"html_i
01-05 17:01:09.107 3736-3820/in.test D/xxx: routes: {"bounds":{"northeast":{"lat":19.1885561,"lng":72.9686183},"southwest":{"lat":19.0842303,"lng":72.9075409}},"copyrights":"Map data ©2016 Google","legs":[{"distance":{"text":"15.8 km","value":15818},"duration":{"text":"26 mins","value":1562},"end_address":"Ghatkopar West, Mumbai, Maharashtra, India","end_location":{"lat":19.0908134,"lng":72.9076817},"start_address":"MP Chowk, Thane West, Thane, Maharashtra 400080, India","start_location":{"lat":19.1855772,"lng":72.9556247},"steps":[{"distance":{"text":"27 m","value":27},"duration":{"text":"1 min","value":6},"end_location":{"lat":19.185599,"lng":72.9558468},"html_instructions":"Head <b>northeast<\/b> on <b>MP Chowk<\/b> toward <b>SG Barve Rd<\/b>","polyline":{"points":"{dbtBsch|L?AA?AA?AA??AAAAA?A?A?AAA?A?A?A?A?A?A@A?A@A?A@A?A@A"},"start_location":{"lat":19.1855772,"lng":72.9556247},"travel_mode":"DRIVING"},{"distance":{"text":"0.9 km","value":870},"duration":{"text":"3 mins","value":165},"end_location":{"lat":19.1883648,"lng":72.963413},"html_instructions":"Exit the roundabout onto <b>Lal Bahadur Shastri Marg<\/b><div style=\"font-size:0.9em\">Pass by Wagle Estate Post Office (on the left)<\/div>","polyline":{"points":"_ebtBaeh|LWoAOcAEe@A_AA{AMcBEQC]COOqAk@sDcAaE_@_Ac@}@[o@o@aAk@w@k@w@e@{@s@{AWm@"},"start_location":{"lat":19.185599,"lng":72.9558468},"travel_mode":"DRIVING"},{"distance":{"text":"2.4 km","value":2448},"duration":{"text":"5 mins","value":316},"end_location":{"lat":19.16823,"lng":72.96618509999999},"html_instructions":"Turn <b>right<\/b> to merge onto <b>NH 3<\/b><div style=\"font-size:0.9em\">Partial toll road<\/div>","polyline":{"points":"gvbtBiti|LQYIOCEGKXEZGp@QvM}CnAWLCNCL?X?jFsAp@QlGaBt@Qh@Of@Mz@WXIRI`@MNGRKrB_AxCqAbCaAz@]^Mb@Mr@Ob@IbDg@v@O|B]XEvAW~@OLAPCN?Z?r@@tG^r@Df@F`@HzDt@lAZl@RrAr@bAn@vC`BtD~B"},"start_location":{"lat":19.1883648,"lng":72.963413},"travel_mode":"DRIVING"},{"distance":{"text":"5.6 km","value":5599},"duration":{"text":"5 mins","value":320},"end_location":{"lat":19.1249579,"lng":72.9390226},"html_instructions":"Keep <b>right<\/b> to stay on <b>NH 3<\/b><div style=\"font-size:0.9em\">Partial toll road<\/div>","maneuver":"keep-right","polyline":{"points":"mx~sBuej|LnEnCnElCXNXNtFhDtFhDnc@jW|AbAtL|GZPTN@@@?B@DD@?DB`@X@?rN|I|BtAb@T~X~NzNtHd_@vRhHtDNJh@ZrCzAh@XxAt@lAn@zo@l\\p@ZdCjA~Bz@fGjB"},"start_location":{"lat":19.16823,"lng":72.96618509999999},"travel_mode":"DRIVING"},{"distance":{"text":"1.5 km","value":1518},"duration":{"text":"2 mins","value":95},"end_location":{"lat":19.1122651,"lng":72.93371189999999},"html_instructions":"Keep <b>left<\/b> to stay on <b>NH 3<\/b>","maneuver":"keep-left","polyline":{"points":"_jvsB{{d|LtCt@v@VxAj@jKjDj@Pt`@zLrKfD~HhC"},"start_location":{"lat":19.1249579,"lng":72.9390226},"travel_mode":"DRIVING"},{"distance":{"text":"2.4 km","value":2371},"duration":{"text":"2 mins","value":139},"end_location":{"lat":19.0923682,"lng":72.9255933},"html_instructions":"Keep <b>right<\/b> to stay on <b>NH 3<\/b>","maneuver":"keep-right","polyline":{"points":"uzssBuzc|LrQlFd@Nd@N|XrInBn@zBp@vQpF`F|AjVpH~PfFzAh@"},"start_location":{"lat":19.1122651,"lng":72.93371189999999},"travel_mode":"DRIVING"},{"distance":{"text":"0.9 km","value":921},"duration":{"text":"1 min","value":54},"end_location":{"lat":19.0849757,"lng":72.9217895},"html_instructions":"Continue straight to stay on <b>NH 3<\/b>","maneuver":"straight","polyline":{"points":"i~osB}gb|LZJ|NlEXHTHn@R|@VvAb@tC~@b@NTHh@TB?TJNHZNTL`@T`@Vr@f@d@^`E~C"},"start_location":{"lat":19.0923682,"lng":72.9255933},"travel_mode":"DRIVING"},{"distance":{"text":"0.1 km","value":132},"duration":{"text":"1 min","value":18},"end_location":{"lat":19.0842303,"lng":72.92085449999999},"html_instructions":"Take the exit on the <b>right<\/b> toward <b>Link Rd<\/b>","maneuver":"ramp-right","polyline":{"points":"cpnsBepa|LBV@@@@rBlBDDBDDF@FFT"},"start_location":{"lat":19.0849757,"lng":72.9217895},"travel_mode":"DRIVING"},{"distance":{"text":"0.3 km","value":275},"duration":{"text":"1 min","value":47},"end_location":{"lat":19.0862782,"lng":72.9194201},"html_i
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01-05 17:01:09.117 3736-3820/in.test D/xxx: distance: {"text":"15.8 km","value":15818}
01-05 17:01:09.117 3736-3820/in.test D/SEE THE DIST :: 15.8 km15818
谢谢肯尼！
【讨论】：