Set style polylines from shapefile

I am loading polylines in a map from a shapefile with this code

folder: List<Overlay> = ShapeConverter.convert(mapView, File(myshape))
mapView.overlayManager.addAll(folder)
mapView.invalidate()

From How to use the osmdroid library (Kotlin) Is someone can tell me, how to style these polylines ?

[samuelBarbarin]

Learn a lot today, I will glad to show you my project some time

[samuelBarbarin]

Thanks for the notion, pretty sure there is a neater code, but it works

val folder: List<Overlay> = ShapeConverter.convert(map, shp)
        for (i in folder.indices) {
            var ov = folder[i]
            if (folder[i] is Polyline) {
                var pl = folder[i] as Polyline
                pl.setColor(Color.LTGRAY)
                pl.setWidth(2.0f)
                map.overlayManager.add(folder[i])
            }
        }