Android distance between two points

Question

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 ?

Answer 1

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);

Answer 2

Try this formula

double dist = Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1- y2, 2));

Or go to this link(More likely better for your case):

http://www.movable-type.co.uk/scripts/latlong.html