You will get distance between two location easily by using below code. You will just need lat/long of both location for which you have to calculate distance.

/**
 * Get distance of location between two locations
 * @param lat2
 * @param lon2
 * @param unit represents the unit of distance
 * @return
 */
public static double distance(double lat1, double lon1,double lat2, double lon2, String unit)
{

    if(lat1 !=0)
    {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2)) + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        if (unit == "K") 
        {
            dist = dist * 1.609344;
        } else if (unit == "N") 
        {
            dist = dist * 0.8684;
        }
        return Math.round(dist);
    }
    else
    {
        return 0;
    }
}

/**
 * This function converts decimal degrees to radians  
 * @param deg
 * @return
 */
private static double deg2rad(double deg) {
    return (deg * Math.PI / 180.0);
}


/**
 * This function converts radians to decimal degrees   
 * @param rad
 * @return
 */
private static double rad2deg(double rad) {
    return (rad * 180.0 / Math.PI);
}

Hope this will help you:)