如何使用Retrofit在recyclerView中正确加载更多项目？(kotlin)

implementation 'com.squareup.retrofit2:retrofit:2.x.x'
implementation 'com.squareup.retrofit2:converter-gson:2.x.x'
implementation 'androidx.recyclerview:recyclerview:1.x.x'

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

interface ApiService {
    @GET("items")
    fun getItems(@Query("page") page: Int): Call<List<Item>>
}

val retrofit = Retrofit.Builder()
    .baseUrl("https://api.example.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .build()

val apiService = retrofit.create(ApiService::class.java)

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) {
            // 到达列表底部，需要加载更多项目
            val nextPage = currentPage + 1
            apiService.getItems(nextPage).enqueue(object : Callback<List<Item>> {
                override fun onResponse(call: Call<List<Item>>, response: Response<List<Item>>) {
                    if (response.isSuccessful) {
                        val items = response.body()
                        // 将加载到的项目添加到RecyclerView的适配器中
                        adapter.addItems(items)
                        currentPage = nextPage
                    }
                }
                
                override fun onFailure(call: Call<List<Item>>, t: Throwable) {
                    // 处理请求失败的情况
                }
            })
        }
    }
})