RecyclerView smoothScroller

RecyclerView.smoothScroller.kt

fun RecyclerView.smoothSnapToPosition(position: Int) {
    val smoothScroller = object : LinearSmoothScroller(this.context) {
        override fun getVerticalSnapPreference(): Int {
            return SNAP_TO_START
        }

        override fun getHorizontalSnapPreference(): Int {
            return SNAP_TO_START
        }

        override fun calculateSpeedPerPixel(displayMetrics: DisplayMetrics?): Float {
            return if (displayMetrics != null)
                10F / displayMetrics.densityDpi
            else
                super.calculateSpeedPerPixel(displayMetrics)
        }
    }
    smoothScroller.targetPosition = position
    layoutManager?.startSmoothScroll(smoothScroller)
}