attachToRecyclerView 不会从 RecyclerView 中删除以前的 ItemHelper

Question

我有一个 RecyclerView，它具有用于删除行的滑动手势。 RecyclerView 的适配器数据会不时重置，在这种情况下，我会将其适配器重新分配给一个新适配器。虽然新数据似乎反映在 UI 中（即 RecyclerView 更新），但滑动手势仍然反映旧适配器。我原以为 attachToRecyclerView() 会处理旧的 ToucherHelper 的删除。根据 attachToRecyclerView() 的文档：

Attaches the ItemTouchHelper to the provided RecyclerView. If TouchHelper is already attached to a RecyclerView, it will first detach from the previous one. You can call this method with null to detach it from the current RecyclerView.

但是，我的日志显示调用 onSwiped() 时适配器的地址仍然是旧适配器的地址。

日志

HistorySwipeHelper init itemCount 0 address 156969509
HistorySwipeHelper init itemCount 3 address 65479865
onSwiped itemCount 0 adapterPosition 0 address 156969509

MyFragment 中的 setupRecyclerView()

private fun setupRecyclerView(historyList: MutableList<HistoryObject>) {
    val historyListAdapter = HistoryListAdapter(historyList)
    val callback = HistorySwipeHelper(historyListAdapter)
    val helper = ItemTouchHelper(callback)
    history_games_list.adapter = historyListAdapter
    helper.attachToRecyclerView(history_games_list)
}

HistorySwipeHelper

class HistorySwipeHelper(private val adapter: HistoryListAdapter) : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
    init {
        Log.d("HistorySwipeHelper", "HistorySwipeHelper init itemCount ${adapter.itemCount} address ${System.identityHashCode(adapter)}")
    }
    
    override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean { return false }

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
        Log.d("HistorySwipeHelper", "onSwiped itemCount ${adapter.itemCount} adapterPosition ${viewHolder.adapterPosition} address ${System.identityHashCode(adapter)}")
        if (viewHolder.adapterPosition < adapter.itemCount) {
            adapter.showMenu(viewHolder.adapterPosition)
        }
    }
}

我可以在存储对当前 ItemHelper 的引用的 Fragment 上创建一个成员变量，并在附加新的之前将其分离。这行得通，但感觉就像代码的味道。有没有一种惯用的方法可以让我的滑动手势与它们所连接的 RecyclerView 保持同步？

Answer 1

尝试手动附加 RecyclerView

class HistorySwipeHelper(private val adapter: HistoryListAdapter) : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
    init {
        Log.d("HistorySwipeHelper", "HistorySwipeHelper init itemCount ${adapter.itemCount} address ${System.identityHashCode(adapter)}")
    }
    
    override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean { return false }

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
        Log.d("HistorySwipeHelper", "onSwiped itemCount ${adapter.itemCount} adapterPosition ${viewHolder.adapterPosition} address ${System.identityHashCode(adapter)}")
        if (viewHolder.adapterPosition < adapter.itemCount) {
            adapter.showMenu(viewHolder.adapterPosition)
        }
    }
}.attachToRecyclerView(yourRecyclerView);

attachToRecyclerView 不会从 RecyclerView 中删除以前的 ItemHelper

attachToRecyclerView doesn't remove previous ItemHelper from RecyclerView

android

swipe

android-recyclerview

日志

MyFragment 中的 setupRecyclerView()

HistorySwipeHelper