android - Get the distance between two locations in android?

Question

i need to get distance between two location, but i need to get distance like blue line in the picture.

I try next:

public double getDistance(LatLng LatLng1, LatLng LatLng2) {
    double distance = 0;
    Location locationA = new Location("A");
    locationA.setLatitude(LatLng1.latitude);
    locationA.setLongitude(LatLng1.longitude);
    Location locationB = new Location("B");
    locationB.setLatitude(LatLng2.latitude);
    locationB.setLongitude(LatLng2.longitude);
    distance = locationA.distanceTo(locationB);

    return distance;
}

but i get red line distance.

Answer 1

Use the Google Maps Directions API. You'll need to request the directions over HTTP. You can do this directly from Android, or via your own server.

For example, directions from Montreal to Toronto:

GET http://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&sensor=false

You'll end up with some JSON. In routes[].legs[].distance, you'll get an object like this:

     "legs" : [
        {
           "distance" : {
              "text" : "542 km",
              "value" : 542389
           },

You can also get the polyline information directly from the response object.

Answer 2

由于 Chris Broadfoot 是正确的，解析返回的 JSONroutes[].legs[].distance

"legs" : [
        {
           "distance" : {
              "text" : "542 km",
              "value" : 542389
           }

利用：

    final JSONObject json = new JSONObject(result);
    JSONArray routeArray = json.getJSONArray("routes");
    JSONObject routes = routeArray.getJSONObject(0);

    JSONArray newTempARr = routes.getJSONArray("legs");
    JSONObject newDisTimeOb = newTempARr.getJSONObject(0);

    JSONObject distOb = newDisTimeOb.getJSONObject("distance");
    JSONObject timeOb = newDisTimeOb.getJSONObject("duration");

    Log.i("Diatance :", distOb.getString("text"));
    Log.i("Time :", timeOb.getString("text"));

Answer 3

public String getDistance(final double lat1, final double lon1, final double lat2, final double lon2){
    String parsedDistance;
    String response;

    Thread thread=new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          URL url = new URL("http://maps.googleapis.com/maps/api/directions/json?origin=" + lat1 + "," + lon1 + "&destination=" + lat2 + "," + lon2 + "&sensor=false&units=metric&mode=driving");
          final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
          conn.setRequestMethod("POST");
          InputStream in = new BufferedInputStream(conn.getInputStream());
          response = org.apache.commons.io.IOUtils.toString(in, "UTF-8");

          JSONObject jsonObject = new JSONObject(response);
          JSONArray array = jsonObject.getJSONArray("routes");
          JSONObject routes = array.getJSONObject(0);
          JSONArray legs = routes.getJSONArray("legs");
          JSONObject steps = legs.getJSONObject(0);
          JSONObject distance = steps.getJSONObject("distance");
          parsedDistance=distance.getString("text");
        } catch (ProtocolException e) {
          e.printStackTrace();
        } catch (MalformedURLException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        } catch (JSONException e) {
          e.printStackTrace();
        }
      }
    });

    thread.start();

    try {
      thread.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    return parsedDistance;
}

Answer 4

您可以在 android 中使用 Location 类的以下方法（如果您有两个位置的纬度、经度），该方法返回以米为单位的近似距离。

public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)

解释：

计算两个位置之间的近似距离（以米为单位），以及它们之间最短路径的初始和最终方位（可选）。距离和方位角是使用 WGS84 椭球定义的。

计算出的距离存储在results[0]. 如果 results 的长度为 2 或更大，则初始方位存储在results[1]. 如果结果的长度为 3 或更大，则最终方位角存储在results[2]. 参数：

startLatitude - 起始纬度

startLongitude 起始经度

endLatitude 结束纬度

endLongitude 结束经度

results 一个浮点数组来保存结果

Answer 5

用这个：

private String getDistanceOnRoad(double latitude, double longitude,
            double prelatitute, double prelongitude) {
        String result_in_kms = "";
        String url = "http://maps.google.com/maps/api/directions/xml?origin="
                + latitude + "," + longitude + "&destination=" + prelatitute
                + "," + prelongitude + "&sensor=false&units=metric";
        String tag[] = { "text" };
        HttpResponse response = null;
        try {
            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            HttpPost httpPost = new HttpPost(url);
            response = httpClient.execute(httpPost, localContext);
            InputStream is = response.getEntity().getContent();
            DocumentBuilder builder = DocumentBuilderFactory.newInstance()
                    .newDocumentBuilder();
            Document doc = builder.parse(is);
            if (doc != null) {
                NodeList nl;
                ArrayList args = new ArrayList();
                for (String s : tag) {
                    nl = doc.getElementsByTagName(s);
                    if (nl.getLength() > 0) {
                        Node node = nl.item(nl.getLength() - 1);
                        args.add(node.getTextContent());
                    } else {
                        args.add(" - ");
                    }
                }
                result_in_kms = String.format("%s", args.get(0));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result_in_kms;
    }

Answer 6

尝试这个：

private double calculateDistance(double fromLong, double fromLat,
            double toLong, double toLat) {
        double d2r = Math.PI / 180;
        double dLong = (toLong - fromLong) * d2r;
        double dLat = (toLat - fromLat) * d2r;
        double a = Math.pow(Math.sin(dLat / 2.0), 2) + Math.cos(fromLat * d2r)
                * Math.cos(toLat * d2r) * Math.pow(Math.sin(dLong / 2.0), 2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        double d = 6367000 * c;
        return Math.round(d);
    }

希望这可以帮助。

Answer 7

您可以使用任何距离 API。Google API 是最受欢迎的 API 之一，但也有一些替代方案，例如距离矩阵 API：文档

它非常易于使用，因为如果您以前习惯使用 Google Maps API，则无需重写代码。

这是请求的示例：

Get: https://api.distancematrix.ai/distancematrix?origins=51.4822656,-0.1933769&destinations=51.4994794,-0.1269979&key=<your_access_token>

这是响应示例：

{
  "destination_addresses":["Westminster Abbey, Westminster, 
  London SW1P 3PA, UK"],
  "origin_addresses":["Chapel, Fulham, London SW6 1BA, UK"],
  "rows":[
    {
      "elements":[
        {
          "distance":{
            "text": "4.7 miles",
            "value": 7563.898
          },
          "duration":{
            "text": "28 min",
            "value": 1680
          },
          "duration_in_traffic":{
            "text": "28 min",
            "value": 1680
          },
          "status": "OK"
        }
      ]
    }
  ],
  "status": "OK"
}

免责声明：我在一家创建此 API 的公司工作。

Answer 8

试试这个代码

public double CalculationByDistance(LatLng StartP, LatLng EndP) {
    int Radius = 6371;// radius of earth in Km
    double lat1 = StartP.latitude;
    double lat2 = EndP.latitude;
    double lon1 = StartP.longitude;
    double lon2 = EndP.longitude;
    double dLat = Math.toRadians(lat2 - lat1);
    double dLon = Math.toRadians(lon2 - lon1);
    double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
            + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * Math.sin(dLon / 2)
            * Math.sin(dLon / 2);
    double c = 2 * Math.asin(Math.sqrt(a));
    double valueResult = Radius * c;
    double km = valueResult / 1;
    DecimalFormat newFormat = new DecimalFormat("####");
    int kmInDec = Integer.valueOf(newFormat.format(km));
    double meter = valueResult % 1000;
    int meterInDec = Integer.valueOf(newFormat.format(meter));
    Log.i("Radius Value", "" + valueResult + "   KM  " + kmInDec
            + " Meter   " + meterInDec);

    return Radius * c;
}

Answer 9

private String getDistance(double lat2, double lon2){
    Location loc1 = new Location("A");
    loc1.setLatitude("A1");
    loc1.setLongitude("B1");
    Location loc2 = new Location("B");
    loc2.setLatitude(lat2);
    loc2.setLongitude(lon2);
    float distanceInMeters = loc1.distanceTo(loc2);
    float mile = distanceInMeters / 1609.34f;
    String sm = String.format("%.2f", mile);
    return sm;
}

Answer 10

要查找 2 个位置之间的距离：

1. 首次打开应用程序时，从左上角的下拉菜单转到“您的时间线”。

2. 新窗口打开后，从右上角菜单中的设置中进行选择，然后选择“添加地点”。

3. 添加您的地点并将它们命名为第 1 点、第 2 点或任何容易记住的名称。

4. 添加并标记您的地点后，请返回您的 Google 应用程序的主窗口。

5. 单击右下角带有箭头的蓝色圆圈。

6. 将打开一个新窗口，您可以在顶部看到两个文本字段，您可以在其中添加“从位置”和“距离位置”。

7. 单击任何文本字段并在第 3 点中输入您保存的位置。

8. 单击另一个文本字段并添加您的下一个保存位置。

9. 通过这样做，谷歌地图将计算两个位置之间的距离，并在地图上显示蓝色路径。