Calculate distance between two geopoints on android

DistFrom.java

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 Float.valueOf((float)dist * meterConversion);
	}