I am new to android, i have managed to write code that displays the google map, i can able to give source and destination addresses and place push pin over there using reverse Geocode concept...
the scenario is i want to display the driving,walking,bicycling directions from source to destination point with displaying a line from source to destination..
AFAIK there is no route calculation functionality in Google Maps for Android. Furthermore, live route calculations for navigation are not allowed by Google Maps terms of service, article 8.7.
For alternative approach take a look at: J2ME/Android/BlackBerry - driving directions, route between two locations
来源：https://stackoverflow.com/questions/4836468/finding-route-directions-from-source-to-destinaton-in-android