NavigationTemplate, MapTemplate not showing map

[TanviJani]

Hello everyone,
I am trying to make android auto navigation app with my existing navigation app.

Tried multiple templates provided by car app library but none of them loading the map. can anyone please help me to add map in app?
how to load map in android auto app? do we need to integrate google map for this? if yes, can anyone please let me know how we can integrate google map?