我想计算recyclerview的滚动速度。我想通过了解用户是否快速向下滚动页面来执行某些操作。
我在StackOverflow上找到了这个代码块。我想这段代码是用来改变滚动速度的。我不想改变，只想计算速度，并根据这个速度执行一些事情。

class CustomLinearLayoutManager : LinearLayoutManager {
    constructor(context: Context?) : super(context) {}
    constructor(context: Context?, orientation: Int, reverseLayout: Boolean) : super(
        context,
        orientation,
        reverseLayout
    ) {
    }

    constructor(
        context: Context?,
        attrs: AttributeSet?,
        defStyleAttr: Int,
        defStyleRes: Int
    ) : super(context, attrs, defStyleAttr, defStyleRes) {
    }

    companion object {
        private const val MILLISECONDS_PER_INCH = 5f //default is 25f (bigger = slower)
    }

    override fun smoothScrollToPosition(
        recyclerView: RecyclerView,
        state: RecyclerView.State?,
        position: Int
    ) {
        val linearSmoothScroller: LinearSmoothScroller =
            object : LinearSmoothScroller(recyclerView.context) {
                override fun computeScrollVectorForPosition(targetPosition: Int): PointF? {
                    return super.computeScrollVectorForPosition(targetPosition)
                }

                protected override fun calculateSpeedPerPixel(displayMetrics: DisplayMetrics): Float {
                    return MILLISECONDS_PER_INCH / displayMetrics.densityDpi
                }
            }
        linearSmoothScroller.setTargetPosition(position)
        startSmoothScroll(linearSmoothScroller)
    }
}