如何使用Paging 3库更新单个项目

data class Item(val id: Int, val name: String)

class MyPagingSource(private val dataSource: DataSource) : PagingSource<Int, Item>() {
    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Item> {
        return try {
            val page = params.key ?: 1
            val response = dataSource.fetchItems(page)
            LoadResult.Page(
                data = response.items,
                prevKey = if (page == 1) null else page - 1,
                nextKey = if (response.items.isEmpty()) null else page + 1
            )
        } catch (e: Exception) {
            LoadResult.Error(e)
        }
    }

    override fun getRefreshKey(state: PagingState<Int, Item>): Int? {
        return state.anchorPosition?.let { anchorPosition ->
            state.closestPageToPosition(anchorPosition)?.prevKey?.plus(1)
                ?: state.closestPageToPosition(anchorPosition)?.nextKey?.minus(1)
        }
    }
}

class MyDataSource {
    suspend fun fetchItems(page: Int): Response {
        // 模拟网络请求或数据库查询
        return Response(listOf(Item(page * 10 + 1, "Item ${page * 10 + 1}"), Item(page * 10 + 2, "Item ${page * 10 + 2}")))
    }

    suspend fun updateItem(item: Item) {
        // 更新数据源中的项目
    }
}

class MyPagingDataAdapter : PagingDataAdapter<Item, MyViewHolder>(ItemDiffCallback()) {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        val binding = ItemBinding.inflate(inflater, parent, false)
        return MyViewHolder(binding)
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val item = getItem(position)
        item?.let {
            holder.bind(it)
        }
    }
}

class MyViewHolder(private val binding: ItemBinding) : RecyclerView.ViewHolder(binding.root) {
    fun bind(item: Item) {
        binding.itemName.text = item.name
    }
}

class ItemDiffCallback : DiffUtil.ItemCallback<Item>() {
    override fun areItemsTheSame(oldItem: Item, newItem: Item): Boolean {
        return oldItem.id == newItem.id
    }

    override fun areContentsTheSame(oldItem: Item, newItem: Item): Boolean {
        return oldItem == newItem
    }
}

fun updateSingleItem(item: Item) {
    // 更新数据源
    dataSource.updateItem(item)

    // 刷新 PagingSource
    val pagingSource = Pager(PagingConfig(pageSize = 10), null, { MyPagingSource(dataSource) }).flow.cachedIn(viewModelScope)

    // 刷新 RecyclerView
    pagingSource.collectLatest { pagingData ->
        adapter.submitData(pagingData)
    }
}