title: Google Maps Android API v2 routes json parsing
body: <p>Hi With the help of LocationManager I managed to find current location in android. 
  For showing routes between two geo- co-ordinates what should I use so that I wont plot air distance instead will show ground routes or is it with help of json can I plot routes.</p>
  
  <p>I have tried polyLine() but it gives straight line.</p>