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import android.location.Address; import android.location.Location;; /** * Class to calculate the distance between two points * in arbitrary units * */ public class Distance { /** Names for the units to use */ public final static int KILOMETERS = 0; public final static int STATUTE_MILES = 1; public final static int NAUTICAL_MILES = 2; /** Radius of the Earth in the units above */ private final static double EARTHS_RADIUS[] = { 6378.1, // Kilometers 3963.1676, // Statue miles 3443.89849 // Nautical miles }; /** Conversion factor to convert from degrees to radians */ private static final double DEGREES_TO_RADIANS = (double)(180/Math.PI); /** * Calculates the "length" of an arc between two points on a sphere * given the latitude & longitude of those points. * @param aLat Latitude of point A * @param aLong Longitude of point A * @param bLat Latitude of point B * @param bLong Longitude of point B * @return */ private static double calclateArc(double aLat, double aLong, double bLat, double bLong) { /* * Convert location a and b's lattitude and longitude * from degrees to radians */ double aLatRad = aLat / DEGREES_TO_RADIANS; double aLongRad = aLong / DEGREES_TO_RADIANS; double bLatRad = bLat / DEGREES_TO_RADIANS; double bLongRad = bLong / DEGREES_TO_RADIANS; // Calculate the length of the arc that subtends point a and b double t1 = Math.cos(aLatRad)*Math.cos(aLongRad)*Math.cos(bLatRad)*Math.cos(bLongRad); double t2 = Math.cos(aLatRad)*Math.sin(aLongRad)*Math.cos(bLatRad)*Math.sin(bLongRad); double t3 = Math.sin(aLatRad)*Math.sin(bLatRad); double tt = Math.acos(t1 + t2 + t3); // Return a "naked" length for the calculated arc return tt; } /** * Calculates the distance between two addresses * @param pointA Address of point A * @param pointB Address of point B * @param units Desired units * @return Distance between the two points in the desired units */ public static double calculateDistance(Address pointA, Address pointB, int units) { return calclateArc(pointA.getLatitude(), pointA.getLongitude(), pointB.getLatitude(), pointB.getLongitude()) * EARTHS_RADIUS[units]; } /** * Calculates the distance between two locations * @param pointA Location of point A * @param pointB Location of point B * @param units Desired units * @return Distance between the two points in the desired units */ public static double calculateDistance(Location pointA, Location pointB, int units) { return calclateArc(pointA.getLatitude(), pointA.getLongitude(), pointB.getLatitude(), pointB.getLongitude()) * EARTHS_RADIUS[units]; } }