1. 实现平滑滚动

自定义 CenterSmoothScroller 实现LinearSmoothScroller

class CenterSmoothScroller(context: Context) : LinearSmoothScroller(context) {
    override fun calculateDtToFit(
        viewStart: Int, viewEnd: Int,
        boxStart: Int, boxEnd: Int,
        snapPreference: Int
    ): Int {
        return (boxStart + boxEnd) / 2 - (viewStart + viewEnd) / 2
    }
}

2.  自定义smoothScrollToPositionView的函数

private fun smoothScrollToPositionView(recyclerView: RecyclerView, position: Int) {
    val context = recyclerView.context
    val layoutManager = recyclerView.layoutManager as LinearLayoutManager
    val smoothScroller = CenterSmoothScroller(context)
    smoothScroller.targetPosition = position
    // 开始平滑滚动
    layoutManager.startSmoothScroll(smoothScroller)
}

3.  自己的页面调用方法：实现scrollToPosition 方法；用 recyclerView.post

private fun scrollToPosition() {
    val position = 10 //假设是10，开发者根据自己的逻辑更改
    //此处用recyclerView.post 的方法，目的是 recyclerView 整体管理布局ok后，再实现滚动；
    recyclerView.post {
       smoothScrollToPositionView(recyclerView, position)
    }
}