NavigationRouter 
    Extends Router to also provide ability for fetching and refreshing NavigationRoutes.
Functions
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                Cancels a specific route refresh request.
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                Cancels a specific route request.
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                abstract fun getRoute(routeOptions: RouteOptions, callback: NavigationRouterCallback): Long
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abstract fun getRoute(routeOptions: RouteOptions, callback: RouterCallback): Long
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Fetch routes based on RouteOptions.
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                abstract fun getRouteRefresh(    route: NavigationRoute,     legIndex: Int,     callback: NavigationRouterRefreshCallback): Long
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Refresh the traffic annotations for a given underlying DirectionsRoute
abstract fun getRouteRefresh(    route: DirectionsRoute,     legIndex: Int,     callback: RouteRefreshCallback): Long
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Refresh the traffic annotations for a given DirectionsRoute