stopNavigation
Stops the current navigation session.
Called when:
User taps "Stop" button on Android Auto navigation screen
Host requests navigation stop via NavigationManagerCallback
Phone app stops navigation
This triggers:
GuidanceViewModel to stop guidance
isGuidanceActive to become false
Android Auto to return to main map screen
Implementation Notes
The adapter should call guidanceViewModel.onEvent(GuidanceEvent.OnStopGuidance).