获取android中两个位置之间的距离?
我需要得到两个位置之间的距离,但我需要得到像图片中的蓝线一样的距离。 我尝试下一步:获取android中两个位置之间的距离?,android,google-maps,android-location,Android,Google Maps,Android Location,我需要得到两个位置之间的距离,但我需要得到像图片中的蓝线一样的距离。 我尝试下一步: public double getDistance(LatLng LatLng1, LatLng LatLng2) { double distance = 0; Location locationA = new Location("A"); locationA.setLatitude(LatLng1.latitude); locationA.setLongitude(LatLn
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;
}
但我有红线距离。试试这个:
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);
}
希望这有帮助。因为Chris Broadfoot是正确的,所以要解析返回的JSON
routes[].legs[].distance
"legs" : [
{
"distance" : {
"text" : "542 km",
"value" : 542389
}
使用:
使用。您需要通过HTTP请求指示。您可以直接从Android或通过您自己的服务器来完成此操作
例如,来自以下方面的说明:
您将得到一些JSON。在routes[].legs[].distance
中,您将得到如下对象:
"legs" : [
{
"distance" : {
"text" : "542 km",
"value" : 542389
},
您还可以直接从响应对象获取多段线信息。使用以下方法:
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;
}
您可以在android中使用Location类的以下方法(如果您有lat,两个位置的long),该方法返回以米为单位的近似距离
public static void distance-between(双起点、双起点、双终点纬度、双终点经度、float[]结果)
说明:
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方位角和最终方位角(可选)。使用WGS84椭球定义距离和方位
计算的距离存储在结果[0]
中。如果结果的长度大于等于2,则初始轴承将存储在results[1]
中。如果结果长度大于等于3,则最终轴承将存储在results[2]
中。
参数:
起始纬度
起始经度
结束纬度结束纬度
结束经度结束经度
结果用于保存结果的浮点数组
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;
}
要查找两个位置之间的距离,请执行以下操作:
您可以使用任何距离API。GoogleAPI是最流行的API之一,但也有一些替代方案,如 它非常容易使用,因为如果您以前习惯使用GoogleMapsAPI,就不需要重写代码 以下是请求的一个示例:
Get: https://api.distancematrix.ai/distancematrix?origins=51.4822656,-0.1933769&destinations=51.4994794,-0.1269979&key=<your_access_token>
免责声明:我在一家创建此API的公司工作。您好,您不需要谷歌地图来使用它[谢谢如果你想计算路线的距离而不是红线,那么你就必须使用谷歌api!它将返回你的距离和估计到达距离的时间!它只返回两个位置的距离计算结果……如果你想使用红线,那么就使用谷歌api。OP想要的是蓝线,而不是红线。你能请解释一下你的代码是如何根据OP得到蓝线距离的?问题是如何通过编程在Android中找到两点之间的距离。这个答案是错误的。为什么你不传递参数“&key=your_API_key”嗨,你知道如何将km转换为仍然使用JSON的m吗?不幸的是,“不推荐使用谷歌地图平台的无钥匙访问”。请更新您的答案。此外,它现在必须使用HTTPS,这将从直线角度返回一个值。我认为这不是OP的意图。不管怎样,这是一个很棒的方法;-)。
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;
}
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;
}
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;
}
Get: https://api.distancematrix.ai/distancematrix?origins=51.4822656,-0.1933769&destinations=51.4994794,-0.1269979&key=<your_access_token>
{
"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"
}