in iOS the manual function is faster than the built-in one, but on Android
the difference is negligible. here's the Objective-C version
//spherical distance in meters
- (CGFloat) sphericalDistanceFromLat1:(CGFloat)lat1 Lon1:(CGFloat)lon1
toLat2:(CGFloat)lat2 Lon2:(CGFloat)lon2 {
return acos(sin(lat1 * 0.0174533) * sin(lat2 * 0.0174533) + cos(lat1 *
0.0174533) * cos(lat2 * 0.0174533) * cos((lon2-lon1) * 0.0174533)) *
6371000;
}
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