Calculating the distance between two latitude and longitude points in android [closed]

Question

How can i find the distance between two latitude & longitude points

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For one of the latitude & longitude points i have it in database & another one i want to use current position of the mobile

Which one should i need to use them among below::

• android location provider
• Google API
• Mathematical Calculation

note:: Any demo code sample will be useful

Answer 1

You can use the built in algorithm:

Location locationA = new Location("point A");      locationA.setLatitude(latA);  locationA.setLongitude(lngA); Location locationB = new Location("point B"); locationB.setLatitude(latB);  LocationB.setLongitude(lngB); distance = locationA.distanceTo(locationB) ; 

update: (I don't have any error with this)

LatLng latLngA = new LatLng(12.3456789,98.7654321); LatLng latLngB = new LatLng(98.7654321,12.3456789);  Location locationA = new Location("point A"); locationA.setLatitude(latLngA.latitude); locationA.setLongitude(latLngA.longitude); Location locationB = new Location("point B"); locationB.setLatitude(latLngB.latitude); locationB.setLongitude(latLngB.longitude);  double distance = locationA.distanceTo(locationB); 

Answer 2

You can use the Haversine algorithm. Another user has already coded a solution for this:

public double CalculationByDistance(double initialLat, double initialLong,                             double finalLat, double finalLong){ int R = 6371; // km double dLat = toRadians(finalLat-initialLat); double dLon = toRadians(finalLong-initialLong); lat1 = toRadians(lat1); lat2 = toRadians(lat2);  double a = Math.sin(dLat/2) * Math.sin(dLat/2) +         Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2);  double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));  return R * c; }  public double toRadians(deg) {   return deg * (Math.PI/180) } 

Source: https://stackoverflow.com/a/17787472/3449528