我只需要提取数据一次，并避免在屏幕旋转时提取它。
我的片段：

private var _binding: FragmentTopArticlesBinding? = null
    private val binding get() = _binding!!
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentTopArticlesBinding.inflate(inflater, container, false)
        getTopArticles()

        return binding.root
    }

状态观察功能：

private fun getTopArticles() {
        var sortedList = emptyList<Article>()
        val adapter = ArticleAdapter(
            onArticleClicked = { title ->
                Toast.makeText(context, title, Toast.LENGTH_SHORT).show()
            }
        )
        binding.recyclerViewTop.layoutManager = LinearLayoutManager(context)
        binding.recyclerViewTop.adapter = adapter

        lifecycleScope.launch {
            viewModel.stateUI.collect { it ->
                when (it) {
                    is StateUI.Success -> {
                        it.articles.collect { articles ->
                            if (articles.isNotEmpty()) {
                                observeArticles(sharedViewModel, articles, adapter)

取数函数：

private suspend fun observeArticles(
            sharedViewModel: SharedViewModel,
            articles: List<Article>,
            adapter: ArticleAdapter
        ) {
            binding.progressBar.visibility = View.GONE
            sharedViewModel.sortState.collect { sortState ->
                val sortedList = when (sortState) {
                    SortOrderState.Ascending -> {
                        sharedViewModel.sortArticles(articles)
                    }
                    SortOrderState.Descening -> {
                        sharedViewModel.sortArticles(articles)
    
                    }
    
                }
                adapter.submitList(sortedList)
    
                binding.recyclerViewTop.postDelayed({
                    binding.recyclerViewTop.scrollToPosition(0)
                }, 1000)
            }
        }

我的任务是在用户点击菜单项排序（升序或降序）时获取和排序2个片段上的数据。问题是当我旋转屏幕时，这些函数获取数据，但我只想在片段中第一次来时做一次。
我删除了这行代码：

override fun onDestroyView() {
    super.onDestroyView()
    _binding = null
}

因为我不能使用scrollToPosition。

• • 编辑：**

视图模型：

private val _cacheArticle = MutableStateFlow(emptyList<Article>())
    val cacheArticle = _cacheArticle.asStateFlow()

    init {
        viewModelScope.launch {

            if(cacheArticle.value.isEmpty()){
                val observeTopArticles = articleRepository.getTopArticles()
                _cacheArticle.value = observeTopArticles
                _stateUI.value = StateUI.Success(articles = observeTopArticles)
                Log.d(TAG, ": PULL")
            } else
            {
                Log.d(TAG, ": CACHE1")
                _stateUI.value = StateUI.Success(articles = _cacheArticle.value)
            }

        }