Display a path in my maps android app -

i tried develop android app maps. i'm beginner in android app development, doesn't know how generate path between current position , destination. can able view current location code shown below.

   package com.example.myapp;  import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.mapfragment; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.model.latlng;  import android.app.activity; import android.os.bundle; import android.view.menu; import android.view.menuitem;  public class grandinmaps extends activity implements onmapreadycallback{      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_grandinmaps);         mapfragment mapfragment = (mapfragment) getfragmentmanager()                 .findfragmentbyid(r.id.map);         mapfragment.getmapasync(this);     }      @override     public void onmapready(googlemap map) {         // todo auto-generated method stub         map.setmylocationenabled(true);         map.movecamera(cameraupdatefactory.newlatlngzoom(                 new latlng(12.971907, 80.220462), 18));      } } 

and doesn't know code generate path destination. help...!!! please:-)

for drawing route can use code:

call printing location route:

   gmapv2direction route;    document document;   latlng toposition = new latlng(routedata.get(i).latitude, routedata.get(i).longitude);                         new getroutetask() {                             @override                             protected void onpostexecute(string s) {                                 super.onpostexecute(s);                             }                         }.execute((latlng) toposition);    private class getroutetask extends asynctask<latlng, void, string> {          string response = "";          @override         protected string doinbackground(latlng... params) {             document = route.getdocument(fromposition, params[0], gmapv2direction.mode_walking);//fromposition latlng object.can current location.             response = "success";             return response;         }          @override         protected void onpostexecute(string s) {             // directionmap.clear();              if (response.equalsignorecase("success")) {                 log.v("map", "got here");                 arraylist<latlng> directionpoint = route.getdirection(document);                 polylineoptions rectline = new polylineoptions().width(10).color(                         color.red);                  (int = 0; < directionpoint.size(); i++) {                     rectline.add(directionpoint.get(i));                 }                 // adding route on map                  map.addpolyline(rectline);             }          }     }