当您选择拖动时，存储此位置

var sourcePosition = -1
override fun onSelectedChanged(viewHolder: RecyclerView.ViewHolder?, actionState: Int) {
     super.onSelectedChanged(viewHolder, actionState)
     if(actionState != ItemTouchHelper.ACTION_STATE_IDLE){
           sourcePosition = viewHolder!!.adapterPosition
     }
}

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当你放下clearView将被调用，获取ViewHolder的位置并交换Collection

override fun clearView(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder) {
    super.clearView(recyclerView, viewHolder)
    val targetPosition = viewHolder.adapterPosition
    if(sourcePosition != -1 && sourcePosition != targetPosition){
        Collections.swap(itemList, sourcePosition, targetPosition)
    }
    sourcePosition = -1
}

型
希望对你有帮助：））

我实现它的方法是重写ItemTouchHelper的clearView()方法，并从该方法调用回调。其内容如下：

class MyTouchHelper(val onActionEnded: () -> Unit) : ItemTouchHelper.SimpleCallback(UP or DOWN, 0) {

    override fun onMove(
        recyclerView: RecyclerView,
        viewHolder: RecyclerView.ViewHolder,
        target: RecyclerView.ViewHolder,
    ): Boolean {
        recyclerView.adapter?.let { adapter ->
            adapter as MyListAdapter
            val from = viewHolder.absoluteAdapterPosition
            val to = target.absoluteAdapterPosition
            adapter.onItemMoved(from, to)
            return true
        }
        return false
    }

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {}

    override fun clearView(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder) {
        super.clearView(recyclerView, viewHolder)
        onActionEnded()
    }
}

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onItemMovied(from, to)是MyListAdapter类中的一个函数，它的实现如下所示：

fun onItemMoved(from: Int, to: Int) {
    val list = currentList.toMutableList()
    list.add(to, list.removeAt(from))
    submitList(list)
}

型
它只是用新项目的位置更新列表（您可能有不同的方法，可以根据需要随意使用它，也可以根本不使用它）。@ vietohoang implementation for updating the list itself seems more efficient.我的天啊！我建议你试一下。
最后，在附加MyTouchHelper的地方，可以使用它的回调来调用特定的函数，如下所示：

ItemTouchHelper(MyTouchHelper {
    updateFirestoreList()// Or any other functions that you want.
}).attachToRecyclerView(recyclerView)

型
我希望能帮上忙。