当应用程序启动时，在我的情况下，屏幕上什么也没有发生（一个没有数据的空白屏幕），但只对logcat中的用户，它显示数据正在从服务器加载。只要我切换到另一个屏幕，数据就会出现一瞬间，然后消失，当我返回到“ForYouScreen”屏幕时，数据就会出现。它应该是：CircularProgressIndicator函数应首先工作，然后显示数据。我提供了下面的代码：

class NewsRepositoryImpl : NewsRepository {
    override fun getNewsArticles(): Flow<Resource<List<NewsArticle?>>> {
        val newsList: MutableList<NewsArticle?> = mutableListOf()
        var temp: List<NewsArticle?>
        val db: FirebaseFirestore = FirebaseFirestore.getInstance()
        return flow{
            emit(Resource.Loading())
            db.collection("newsArticles").get()
                .addOnSuccessListener { queryDocumentSnapshots ->
                    if (!queryDocumentSnapshots.isEmpty) {
                        val list = queryDocumentSnapshots.documents
                        for (d in list) {
                            val c: NewsArticle? = d.toObject(NewsArticle::class.java)
                            newsList.add(c)
                        }
                    }
                }
            temp = newsList
            emit(Resource.Success(temp))
        }.catch {
            emit(Resource.Error(it.message.toString()))
        }
    }
}

class GetNewsArticlesUseCase(
    private val repository: NewsRepository
) {
    operator fun invoke(): Flow<Resource<List<NewsArticle?>>> {
        return repository.getNewsArticles()
    }
}

class ForYouScreenViewModel(
    private val getNewsArticlesUseCase: GetNewsArticlesUseCase
) : ViewModel() {
    private val _state = mutableStateOf(ForYouState())
    val state: State<ForYouState> = _state
    init {
        loadNewsArticles()
    }
    private fun loadNewsArticles() {
        getNewsArticlesUseCase().onEach { result ->
            when(result){
                is Resource.Success -> {
                    _state.value = ForYouState(newsArticles = result.data ?: emptyList())
                }
                is Resource.Loading -> {
                    _state.value = ForYouState(isLoading = true)
                }
                is Resource.Error -> {
                    _state.value = ForYouState(error = result.message ?: "An unexpected error occurred")
                }
            }
        }.launchIn(viewModelScope)
    }
}
data class ForYouState(
    val isLoading: Boolean = false,
    val newsArticles: List<NewsArticle?> = emptyList(),
    val error: String = ""
)

@Composable
fun ForYouScreen(
    externalRouter: Router,
    lifecycleOwner: LifecycleOwner,
    viewModel: ForYouScreenViewModel = koinViewModel()
) {
    val state = viewModel.state.value
    Box(modifier = Modifier.fillMaxSize()) {
        LazyColumn(modifier = Modifier.fillMaxSize()) {
            items(state.newsArticles) { item ->
                AsyncImage(model = item?.image, contentDescription = null)
                item?.title?.let { Text(text = it) }
            }
        }
        if(state.error.isNotBlank()) {
            Text(
                text = state.error,
                color = MaterialTheme.colorScheme.error,
                textAlign = TextAlign.Center,
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(horizontal = 20.dp)
                    .align(Alignment.Center)
            )
        }
        if(state.isLoading) {
            CircularProgressIndicator(modifier = Modifier.align(Alignment.Center))
        }
    }
}

我将感激你的帮助！