How to find distance (by road) between 2 geo points in Android application without using google map direction api? -


i developing android application. need find distance between 2 geo coordinates.

i used location.distancebetween() , location.distanceto() functions. these functions give straight distance, actual distance different when travel road.

use google api as

public float getdistance(double lat1, double lon1, double lat2, double lon2) {         string result_in_kms = "";         string url = "http://maps.google.com/maps/api/directions/xml?origin=" + lat1 + "," + lon1 + "&destination=" + lat2 + "," + lon2 + "&sensor=false&units=metric";         string tag[] = {"text"};         httpresponse response = null;         try {             httpclient httpclient = new defaulthttpclient();             httpcontext localcontext = new basichttpcontext();             httppost httppost = new httppost(url);             response = httpclient.execute(httppost, localcontext);             inputstream = response.getentity().getcontent();             documentbuilder builder = documentbuilderfactory.newinstance().newdocumentbuilder();             document doc = builder.parse(is);             if (doc != null) {                 nodelist nl;                 arraylist args = new arraylist();                 (string s : tag) {                     nl = doc.getelementsbytagname(s);                     if (nl.getlength() > 0) {                         node node = nl.item(nl.getlength() - 1);                         args.add(node.gettextcontent());                     } else {                         args.add(" - ");                     }                 }                 result_in_kms =string.valueof( args.get(0));             }         } catch (exception e) {             e.printstacktrace();         }         float f=float.valueof(result_in_kms);         return f*1000;     }

or can use following function

public final static double average_radius_of_earth = 6371;     public float calculatedistance(double userlat, double userlng, double venuelat, double venuelng) {          double latdistance = math.toradians(userlat - venuelat);         double lngdistance = math.toradians(userlng - venuelng);          double = (math.sin(latdistance / 2) * math.sin(latdistance / 2)) +                         (math.cos(math.toradians(userlat))) *                         (math.cos(math.toradians(venuelat))) *                         (math.sin(lngdistance / 2)) *                         (math.sin(lngdistance / 2));          double c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a));          return (float) (math.round(average_radius_of_earth * c));      }

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