OffRoadTomTomNavigationFactory

val configuration = Configuration(
    context = context,
    locationProvider = customLocationProvider
)
val tomTomNavigation = OffRoadTomTomNavigationFactory.create(configuration)

import android.content.Context
import com.tomtom.sdk.location.GeoLocation
import com.tomtom.sdk.location.GeoPoint
import io.ticofab.androidgpxparser.parser.GPXParser

fun getGeoLocationsFromGpxFileTracks(context: Context, fileName: String): List<GeoLocation> =
    context.assets.open(fileName).use { inputStream ->
        GPXParser().parse(inputStream)
             // list of coordinates from tracks
            .tracks
            .flatMap { it.trackSegments }
            .flatMap { it.trackPoints }
            .map { GeoLocation(GeoPoint(it.latitude, it.longitude)) }
    }

fun getGeoLocationsFromGpxFileWaypoints(context: Context, fileName: String): List<GeoLocation> =
    context.assets.open(fileName).use { inputStream ->
        GPXParser().parse(inputStream)
             // list of coordinates from waypoints
            .waypoints
            .map { GeoLocation(GeoPoint(it.latitude, it.longitude)) }
    }

/**
 * Creates a [route][Route] from a [GeoLocation] list representing a route.
 * The created route contains:
 *  - One leg with geometry as provided [locations].
 *  - Origin as the first point from provided [locations].
 *  - Destination as the last point from provided [locations].
 *  - Total length of the route.
 *  - Calculated route points.
 *
 * The created route doesn't contain:
 *  - Travel, departure, and arrival time.
 *  - Guidance instructions.
 *
 * @param locations The geometry of the [route][Route].
 * @return Created [route][Route]
 * @throws IllegalArgumentException when [locations] doesn't contain at least two points.
 */
fun createRoute(locations: List<GeoLocation>): Route {
    require(locations.size >= 2) { "Locations must contains at least 2 points." }
    // Calculate the total distance covered by all items in the input geoLocations list.
    val distances = locations.runningFoldIndexed(Distance.ZERO) { index, distance, location ->
        if (index == 0) {
            Distance.ZERO
        } else {
            distance + location.position.distanceTo(locations[index - 1].position)
        }
    }.drop(1) // remove Distance.ZERO added  as initial value
    val routeSummary = Summary(
        length = distances.last(),
        travelTime = Duration.ZERO,
        departureTimeWithZone = Calendar.getInstance(),
        arrivalTimeWithZone = Calendar.getInstance()
    )
    val routeLeg = RouteLeg(
        points = locations.map { it.position },
        instructions = emptyList(),
        summary = routeSummary
    )
    val origin = RouteStop(
        id = RouteStopId(),
        place = Place(locations.first().position),
        navigableCoordinates = listOf(locations.first().position),
        routeOffset = Distance.ZERO
    )
    val destination = RouteStop(
        id = RouteStopId(),
        place = Place(locations.last().position),
        navigableCoordinates = listOf(locations.last().position),
        routeOffset = routeSummary.length
    )
    // Create a route
    return Route(
        id = RouteId(),
        summary = routeSummary,
        legs = listOf(routeLeg),
        routeStops = listOf(origin, destination),
        sections = Sections(),
        modificationHistory = RouteModificationHistory(
            RouteTimestamp(0L, Calendar.getInstance())
        ),
        // Create a list of route points
        routePoints = locations.mapIndexed { index, location ->
            RoutePoint(
                location.position,
                distances[index],
                Duration.ZERO,
                null,
            )
        }
    )
}

override fun onRouteTrackingStateUpdated(routeTrackingState: RouteTrackingState) {
    val lastKnownPosition = tomtomNavigation.locationProvider.lastKnownLocation?.position ?: return
    this.routeTrackingState.postValue(routeTrackingState to position)
}

private val routeTrackingStateObserver = Observer<Pair<RouteTrackingState, GeoPoint>> { trackingState ->
     if (currentState is MainViewState.Navigating && isOffRoad()) {
         val state = trackingState.first
         if (state is RouteTrackingState.Deviated) {
             // One of the possible ways of deviation handling is to show a dotted line indicating the shortest path back to the planned route from the user's current location,
             // using the coordinates from backToRoutePoint, the point where the user has deviated from the planned route.
             drawBackToRouteDottedPolyline(listOf(state.backToRoutePoint, trackingState.second))
         } else {
             // When the user is back on the planned route the previously added dotted line can be removed.
             removeBackToRouteDottedPolyline()
         }
     }
 }

val routeTrackingStateUpdatedListener: RouteTrackingStateUpdatedListener = ...
tomTomNavigation.addRouteTrackingStateUpdatedListener(routeTrackingStateUpdatedListener)

tomTomNavigation.removeRouteTrackingStateUpdatedListener(routeTrackingStateUpdatedListener)