finish a PolyLine and open another activity in kotlin and google maps

My question is from my location and when I reach the goal I finish the polylinea and launch another activity I share my code

private fun cargarURL(url:String){
    val queue = Volley.newRequestQueue(this)
    val solictud = StringRequest(Request.Method.GET, url, Response.Listener {
        response ->
        Log.d("HTTP", response)
        val coordenadas = ObtenerCoordenadas(response)

        if (rutaMarcada != null){
            rutaMarcada?.remove()
        }

        rutaMarcada = mMap.addPolyline(coordenadas)

    }, Response.ErrorListener {  })
    queue.add(solictud)
}

private fun ObtenerCoordenadas(json:String): PolylineOptions {
    val gson = Gson()
    val objeto = gson.fromJson(json, com.voxpop.juckevox.juckevox.Response::class.java)
    val puntos = objeto.routes?.get(0)!!.legs?.get(0)!!.steps!!

    var coordenadas = PolylineOptions()
    for (punto in puntos){
        coordenadas.add(punto.start_location?.toLatLng())
        coordenadas.add(punto.end_location?.toLatLng())

    }