Util.java

package com.theostriches.amaretto.android.util;

public class Util {

	public static float distFrom(float lat1, float lng1, float lat2, float lng2) {
		double earthRadius = 3958.75;
		double dLat = Math.toRadians(lat2 - lat1);
		double dLng = Math.toRadians(lng2 - lng1);
		double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(lat1))
				* Math.cos(Math.toRadians(lat2)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);
		double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
		double dist = earthRadius * c;

		int meterConversion = 1609;

		return new Float(dist * meterConversion).floatValue();
	}

}