Android两点之间的距离 [英] Android distance between two points

问题描述

我有3种方法来计算距离，所有3都给出了不同的答案。

  double lat = 6.924049; 
 double lng = 79.853807; 
 
 double lat1 = 6.856461; 
 double lng1 = 79.912748; 
  

如何计算两点之间的距离以及如何在Km上进行百分比？或米？

第一种方式 ans = 9.967441199417708E-6

  float [] results = new float [1]; 
 Location.distanceBetween（lat / 1E6，lng / 1E6，lat1 / 1E6，lng1 / 1E6，results）; 
 float s = results [0] * 0.000621371192f; 
 String a2 = Float.toString（s）; 
  

第二种方式 ans = 6.1795527E6

  double lat3 = lat / 1E6; 
 double lat2 = lat1 / 1E6; 
 double lon3 = lng / 1E6; 
 double lon2 = lng1 / 1E6; 
 double dLat = Math.toRadians（lat2  -  lat3）; 
 double dLon = Math.toRadians（lon2  -  lon3）; 
 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.atan2（Math.sqrt（a），Math.sqrt（1-a））; 
 // 6378.1是地球的重力
 double asd = c * 6378.1; 
  

第三种方式 ans = 6.176576174444191

  {
 double a5 = distance（lat，lng，lat1，lng1）; 
 String a6 = Double.toString（a5）; 
} 
私人双倍距离（double lat1，double lon1，double lat2，double lon2）{
 double theta = lon1  -  lon2; 
 double dist = Math.sin（deg2rad（lat1））* Math.sin（deg2rad（lat2））
 + Math.cos（deg2rad（lat1））* Math.cos（deg2rad（lat2）） 
 * Math.cos（deg2rad（theta））; 
 dist = Math.acos（dist）; 
 dist = rad2deg（dist）; 
 dist = dist * 60 * 1.1515; 
 return（dist）; 
} 
 
 private double deg2rad（double deg）{
 return（deg * Math.PI / 180.0）; 
} 
 
 private double rad2deg（double rad）{
 return（rad * 180.0 / Math.PI）; 
} 
  

所以，如何计算两点之间的距离以及如何对它进行百分比KM？或Meters？

解决方案

http://developer.android.com/reference/android/location/Location.html

使用distanceTo或距离方法。
为什么不尝试Android的位置方法这里

您可以从纬度和经度创建一个Location对象：

 位置位置=新位置（）; 
 location.setLatitude（lat）; 
 location.setLongitude（lon）; 
  

I have 3 ways to calculate the distance and all 3 gives me different answers,

    double lat = 6.924049;
    double lng = 79.853807;

    double lat1 = 6.856461;
    double lng1 = 79.912748;

How to calculate the distance between two points and how to percent it on Km? or Meters?

1st way ans = 9.967441199417708E-6

float[] results = new float[1];
Location.distanceBetween(lat / 1E6, lng / 1E6, lat1 / 1E6, lng1 / 1E6,results);
float s =results[0] * 0.000621371192f;
String a2 = Float.toString(s);

2nd way ans = 6.1795527E6

double lat3 = lat / 1E6;
double lat2 = lat1 / 1E6;
double lon3 = lng / 1E6;
double lon2 = lng1 / 1E6;
double dLat = Math.toRadians(lat2 - lat3);
double dLon = Math.toRadians(lon2 - lon3);
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.atan2(Math.sqrt(a), Math.sqrt(1 - a));
// 6378.1 is gravity of earth
double asd = c * 6378.1;

3rd way ans =6.176576174444191

{
double a5 = distance(lat, lng, lat1, lng1);
String a6 = Double.toString(a5);
}
private double distance(double lat1, double lon1, double lat2, double lon2) {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
                + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))
                * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        return (dist);
    }

    private double deg2rad(double deg) {
        return (deg * Math.PI / 180.0);
    }

    private double rad2deg(double rad) {
        return (rad * 180.0 / Math.PI);
    }

So, How to calculate the distance between two points and how to percent it on KM ? or Meters ?

解决方案

http://developer.android.com/reference/android/location/Location.html

Use the distanceTo or distanceBetween methods. Why dont you try the Android's Location method here

You can create a Location object from a latitude and longitude:

Location location = new Location("");
location.setLatitude(lat);
location.setLongitude(lon);

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