如何在Kotlin中实现Android分页

// 定义一个数据模型类
data class Item(val id: String, val name: String)

// 创建适配器类
class ItemsAdapter(private val items: MutableList<Item>) : RecyclerView.Adapter<ItemsAdapter.ItemViewHolder>() {
    // 绑定数据视图
    override fun onBindViewHolder(holder: ItemViewHolder, position: Int) {
        val item = items[position]
        holder.bind(item)
    }

    // 创建数据视图
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_layout, parent, false)
        return ItemViewHolder(view)
    }

    // 返回数据项数量
    override fun getItemCount(): Int {
        return items.size
    }

    // 更新数据项
    fun updateItems(newItems: List<Item>) {
        items.clear()
        items.addAll(newItems)
        notifyDataSetChanged()
    }

    // 定义数据视图的ViewHolder
    class ItemViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val nameTextView: TextView = itemView.findViewById(R.id.nameTextView)

        fun bind(item: Item) {
            nameTextView.text = item.name
        }
    }
}

// 在Activity中使用分页加载
class MainActivity : AppCompatActivity() {
    private lateinit var recyclerView: RecyclerView
    private lateinit var adapter: ItemsAdapter
    private var currentPage = 1

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        recyclerView = findViewById(R.id.recyclerView)
        recyclerView.layoutManager = LinearLayoutManager(this)
        adapter = ItemsAdapter(mutableListOf())
        recyclerView.adapter = adapter

        recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)

                val layoutManager = recyclerView.layoutManager as LinearLayoutManager
                val visibleItemCount = layoutManager.childCount
                val totalItemCount = layoutManager.itemCount
                val firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition()

                if (visibleItemCount + firstVisibleItemPosition >= totalItemCount && firstVisibleItemPosition >= 0) {
                    loadNextPage()
                }
            }
        })

        loadNextPage()
    }

    private fun loadNextPage() {
        // 发送分页加载请求，获取下一页数据
        val nextPage = currentPage + 1

        // 在此处添加网络请求代码，根据分页参数请求数据

        // 模拟返回的数据
        val newData = listOf(
            Item("1", "Item 1"),
            Item("2", "Item 2"),
            Item("3", "Item 3")
        )

        // 将数据添加到适配器中
        adapter.updateItems(newData)

        currentPage = nextPage
    }
}