Calculating driver routes in Android 2.1

Hello , i'm a new to the Android SDK, and i'm building an application based on Gps, and Google maps. I want to calculate routes on the map and i have a few options:
1) using the Google navigation by an intent
2) using a kml file to draw the route
3) embeding a map into a html file to use the full functionality of the java script google maps api ( i would rather use the mapview control)
I really don't know what's the best practice in this case.
Thank you in advance for any replies.