Find distance between two points on map using Google Map API V2

Question

I am using google map api v2 in my android application, I am able to show the map and put markers on it, but now I am stuck with the problem in which I need to find out the distance between two markers or points placed on map, I have already gone through the docs but didn't find anything helpful in this case.

If anyone knows how to solve this then please help me.

Thanks

Answer 1

In Google Map API V2 You have LatLng objects so you can't use distanceTo (yet).

You can then use the following code considering oldPosition and newPosition are LatLng objects :

// The computed distance is stored in results[0]. //If results has length 2 or greater, the initial bearing is stored in results[1]. //If results has length 3 or greater, the final bearing is stored in results[2]. float[] results = new float[1]; Location.distanceBetween(oldPosition.latitude, oldPosition.longitude,                 newPosition.latitude, newPosition.longitude, results); 

For more informations about the Location class see this link

Answer 2

You can use the following method that will give you accurate result

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;     }