google maps - Navigation in android app for updating of destination location -


scenario :

in android app, have google map showing me friend's location. friend , can move position , still want him (finding friend's location/updated_location not issue). reach him fast, implementing navigation functionality it.

question :

  1. how can implement navigation google map? heard opentripplanner, i'm not sure if can use in google maps.

  2. as friend's , location can change, want update navigation path current location current location. (an idea have recalculate path when friend's location changes).

  3. i want implement voice navigation app. how can this?

any suggestion satisfy above requirement appreciated.
please suggest sample code , working functions can used.

you can take @ blog post wrote on implementing navigation polyline google maps api v2:

google maps api v2 polyline navigation

there find needed method navigation instruction google directions api , paint on map.


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