onRouteAlternativeRequestFinished

Invoked when on-demand alternative routes request finishes.

The alternatives list always represent all available, up-to-date, alternatives for the current route.

The alternatives are not automatically added to MapboxNavigation, you need to add them manually to trigger RoutesObserver, for example: todo update docs (no fun int)

mapboxNavigation.requestAlternativeRoutes(
    NavigationRouteAlternativesRequestListener { routeProgress, alternatives, routerOrigin ->
        val newRoutes = mutableListOf<NavigationRoute>().apply {
            add(mapboxNavigation.getNavigationRoutes().first())
            addAll(alternatives)
        }
        mapboxNavigation.setRoutes(newRoutes)
    }
)

You can filter the alternatives out before setting them back to MapboxNavigation based on requirements.

Parameters