我正在做一个Android Compose项目，我使用Paging 3沿着LazyColumn来显示从网络调用中获取的项目列表。Paging 3的默认行为是在用户滚动时加载基于prefetchDistance的页面，但在我的情况下，它加载了大约15个页面，每个包含10个记录启动屏幕。我试过设置prefetchDistace为10，但它不工作。
代码如下：ViewModel

class ShowAllNotificationsViewModel @Inject constructor(private val pagingSource: NotificationPagingSource) :
    BaseViewModel() {
    private val _uiState =
        MutableStateFlow<UIState<BaseResponseModel<NotificationResponseModel?>>>(UIState.StateLoading)
    val uiState = _uiState.asStateFlow()
    private val _isRefreshing = MutableStateFlow(false)
    val isRefreshing = _isRefreshing.asStateFlow()
    val items: Flow<PagingData<NotificationModel>> = Pager(
        config = PagingConfig(
            pageSize = 10,
            prefetchDistance = 5,
            enablePlaceholders = false,
        ),
        pagingSourceFactory = { pagingSource }
    )
        .flow
        .cachedIn(viewModelScope)
    fun refreshData() {
        pagingSource.invalidate()
    }
}

字符串

页面来源：

class NotificationPagingSource @Inject constructor(val requestNotificationsUseCase: GetNotificationsUseCase) :
    PagingSource<String, NotificationModel>() {
    override suspend fun load(params: LoadParams<String>): LoadResult<String, NotificationModel> {
        Timber.e(IllegalStateException())
        Timber.d("load params = $params")
        val responseModel = requestNotificationsUseCase(params.key)
        val result = responseModel?.getAsResult();
        result?.let {
            return@load when (result) {
                is Result.Error<*>,
                Result.Loading,
                is Result.SessionTimeoutError<*> -> {
                    LoadResult.Error(
                        SessionTimeoutException()
                    )
                }
                is Result.Success -> {
                    LoadResult.Page(
                        result.value.data?.notifications ?: listOf(),
                        prevKey = null,
                        nextKey = result.value.data?.lastId,
                    )
                }
            }
        }
        return LoadResult.Error(
            IllegalStateException()
        )
    }
    override fun getRefreshKey(state: PagingState<String, NotificationModel>): String? {
        Timber.d("getRefreshKey = state = $state")
        return null
    }
}

型

用户界面：

@Composable
    fun ShowAllNotificationCompose(items: LazyPagingItems<NotificationModel>) {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .background(Color.Black)
        ) {
            Timber.d("ShowAllNotificationCompose : state = ${items.loadState}")
            HeaderCompose()
            Box(
                modifier = Modifier
                    .weight(1f)
            ) {
                val listState = rememberLazyListState()
                LazyColumn(
                    modifier = Modifier,
                    state = listState
                ) {
                    items(
                        count = items.itemCount,
                        key = {
                            items[it]?.id ?: 0
                        }
                    ) {
                        val notificationModel = items[it]
                        if (notificationModel != null) {
                            NotificationItem(item = notificationModel)
                        } else {
                            NotificationShimmerItem()
                        }
                    }
                   if (items.loadState.append == LoadState.Loading) {
                        items(2) {
                            NotificationShimmerItem()
                        }
                    }
                }
            }
        }
    }
}

型
有没有一种方法可以修改这个设置，以确保分页请求只在到达prefectchDistance后调用。提前感谢。