安卓分页库中的loadAfter()从API无限加载第一页

dependencies {
    implementation "androidx.paging:paging-runtime:3.0.0"
}

class MyPagingSource(private val apiService: ApiService) : PagingSource<Int, DataItem>() {
    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, DataItem> {
        try {
            val nextPage = params.key ?: 1
            val response = apiService.getData(nextPage, params.loadSize)
            val data = response.data
            val prevPage = if (nextPage > 1) nextPage - 1 else null
            val nextPage = if (data.isNotEmpty()) nextPage + 1 else null
            return LoadResult.Page(data, prevPage, nextPage)
        } catch (e: Exception) {
            return LoadResult.Error(e)
        }
    }
}

class MyViewModel(private val apiService: ApiService) : ViewModel() {
    val data: Flow<PagingData<DataItem>> = Pager(PagingConfig(pageSize = 20)) {
        MyPagingSource(apiService)
    }.flow
}

class MyFragment : Fragment() {
    private val viewModel: MyViewModel by viewModels()
    private val adapter = MyAdapter()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        recyclerView.adapter = adapter
        lifecycleScope.launch {
            viewModel.data.collectLatest { pagingData ->
                adapter.submitData(pagingData)
            }
        }
    }
}