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我想获得两个地理点坐标之间的道路距离。目前我正在获取路径，但它不是很准确，因为它考虑了道路的起点和终点，而不是道路中的曲线。我正在使用以下代码：

Double sLat = Double.parseDouble(getIntent().getStringExtra("sLat"));
Double sLon = Double.parseDouble(getIntent().getStringExtra("sLon"));
Double dLat = Double.parseDouble(getIntent().getStringExtra("dLat"));
Double dLon = Double.parseDouble(getIntent().getStringExtra("dLon"));

MapView mv = (MapView) findViewById(R.id.mapview);
mv.setBuiltInZoomControls(true);
MapController mc = mv.getController();
ArrayList<GeoPoint> all_geo_points = getDirections(sLat, sLon, dLat, dLon);
GeoPoint moveTo = (GeoPoint) all_geo_points.get(0);
mc.animateTo(moveTo);
mc.setZoom(18);
mv.getOverlays().add(new MyOverlay(all_geo_points));

    public static ArrayList<GeoPoint> getDirections(double lat1, double lon1, double lat2, double lon2) 
{
    String url = "http://maps.googleapis.com/maps/api/directions/xml?origin=" +lat1 + "," + lon1  + "&destination=" + lat2 + "," + lon2 + "&sensor=false&units=metric";
    String tag[] = { "lat", "lng" };
    ArrayList<GeoPoint> list_of_geopoints = new ArrayList<GeoPoint>();
    HttpResponse response = null;
    try 
    {
        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);
        response = httpClient.execute(httpPost, localContext);
        InputStream in = response.getEntity().getContent();
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        Document doc = builder.parse(in);
        if (doc != null) {
            NodeList nl1, nl2;
            nl1 = doc.getElementsByTagName(tag[0]);
            nl2 = doc.getElementsByTagName(tag[1]);
            if (nl1.getLength() > 0) {
                list_of_geopoints = new ArrayList<GeoPoint>();
                for (int i = 0; i < nl1.getLength(); i++) {
                     Node node1 = nl1.item(i);
                     Node node2 = nl2.item(i);
                     double lat = Double.parseDouble(node1.getTextContent());
                     double lng = Double.parseDouble(node2.getTextContent());
                     list_of_geopoints.add(new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6)));
                 }
             } else {
                        // No points found
                    }
    }
} 

            catch (Exception e) 
            {
                e.printStackTrace();
            }

            return list_of_geopoints;
        }

        @Override
        protected boolean isRouteDisplayed() {
            // TODO Auto-generated method stub
            return false;
        }

谁能给我一些想法如何改善这条路线以及如何通过公路获得距离。目前我以公里为单位获得乌鸦飞行距离，但我需要通过公路获得距离。

提前致谢。

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3 回答 3

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您可能想使用Google 距离矩阵 API

例如，这里是巴黎（法国）和柏林（德国）之间的汽车距离

http://maps.googleapis.com/maps/api/distancematrix/json?origins=Paris|France&destinations=Berlin|Germany&mode=car&language=fr-FR&sensor=false

于 2013-11-24T09:52:45.457 回答
0

如果你想得到所有的分数，你必须解析<polyline><points>a~l~Fjk~uOwHJy@P</points></polyline>而不是只取<lat>and <lng>。

Android Maps Utils将帮助您解析那个有趣的字符串。

于 2013-11-24T10:12:09.320 回答
0 
    <html>
    <head><title>dis</title></head>
    <script type="text/javascript" src="http://maps.google.com/maps/api/js?
    sensor=false&libraries=geometry"></script>

    <script>
    var p1 = new google.maps.LatLng(45.463688, 9.18814);
    var p2 = new google.maps.LatLng(46.0438317, 9.75936230000002);

    alert(calcDistance(p1, p2));

    //calculates distance between two points in km's
    function calcDistance(p1, p2) {
      return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
    }

    </script>
    <body>
     </body>
     </html>
于 2017-11-29T07:31:36.417 回答