[android-developers] Need some math assistance please

Hello,

I'm trying to work out the distance moved between 2 points with GPS coordinates.

I have found the haversine function, but I'm not sure how to convert
it to run within androids java.

Can anyone help?

JavaScript:

var R = 6371; // km
var dLat = (lat2-lat1).toRad();
var dLon = (lon2-lon1).toRad();
var lat1 = lat1.toRad();
var lat2 = lat2.toRad();

var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;

Regards,
Fred

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