android - ViewPager2 看到下一页的一部分并在屏幕第一页和最后一页居中

Question

我有一个配置了各种扩展功能的 RecyclerView 以居中并查看下一项：

fun RecyclerView.pageSnap() = this.post {
    if (this.onFlingListener == null) PagerSnapHelper().attachToRecyclerView(this)
}

fun RecyclerView.snapCenterWithMargin(left: Int, top: Int, right: Int, bottom: Int) {
    val offsetItemDecoration = SnapCenterWithMargin(left, top, right, bottom)
    this.addItemDecoration(offsetItemDecoration)
}

private class SnapCenterWithMargin(
    private val left: Int,
    private val top: Int,
    private val right: Int,
    private val bottom: Int
) : RecyclerView.ItemDecoration() {

    override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
        view.measure(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)
        val position = parent.getChildAdapterPosition(view)
        val firstItem = 0
        val lastItem = state.itemCount - 1
        when (position) {
            firstItem -> {
                val firstPadding = (parent.width) / 2 - view.measuredWidth / 2
                outRect.set(firstPadding, 0, 0, 0)
            }
            lastItem -> {
                val lastPadding = (parent.width) / 2 - view.measuredWidth / 2
                outRect.set(0, 0, lastPadding, 0)
            }
            else -> {
                outRect.set(left, top, right, bottom)
            }
        }
    }

}

问题是这种方法的 ListAdapter 动画不好。然后我尝试移动到 ViewPager2 但我无法获得这种行为（请参阅下一个屏幕并保持项目居中）。