kotlin - アプリを切り離した後、もう一度開くと、最後の検索クエリの結果が表示されず、代わりにデフォルトの結果が表示されます

Question

This Fragment saving result when it detach in onStop() method and in onStart() read last query result and again display it.

フラグメントが停止したとき、またはアプリがプロセスから切り離されたときにクエリ結果を保存しようとしています。プロセスに戻ったときに、アプリは最後の検索クエリ結果を表示しますが、アプリはデフォルトのクエリ結果を表示します。事前に感謝し、英語で申し訳ありません。

コトリン

    @AndroidEntryPoint
    class GalleryFragment : Fragment(R.layout.fragment_gallery),
        GalleryPhotoAdapter.OnClickItemListener {
    
        private val galleryViewModel by viewModels<GalleryViewModel>()
        lateinit var queryUpdate: String
        lateinit var photoAdapter: GalleryPhotoAdapter
        private lateinit var binding: FragmentGalleryBinding
        @Inject
        lateinit var lastPreference:LastPreference
        override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
            super.onViewCreated(view, savedInstanceState)
            binding = FragmentGalleryBinding.bind(view)
            // dataStore= context?.createDataStore(name = "SAVED_QUERY")!!
            Log.d("GalleryFragment", "onViewCreated:context is  $context")
            photoAdapter = GalleryPhotoAdapter(this)
            setupRecyclerView()
         //   updateQueryData("cats")
            setHasOptionsMenu(true)
        }
    
        private fun updateQueryData(query: String) {
            viewLifecycleOwner.lifecycleScope.launchWhenStarted {
                galleryViewModel.getPhotos(query).collectLatest {
                    photoAdapter.submitData(it)
                }
            }
        }
    
        override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
            super.onCreateOptionsMenu(menu, inflater)
            inflater.inflate(R.menu.gallery_menu, menu)
            val searchItem = menu.findItem(R.id.search_view)
            val searchView = searchItem.actionView as SearchView
            searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
                override fun onQueryTextSubmit(query: String?): Boolean {
                    if (query != null) {
                        binding.recyclerView.scrollToPosition(0)
                        queryUpdate = query
                        updateQueryData(query)
                        searchView.clearFocus()
                    }
                    return true
                }
    
                override fun onQueryTextChange(newText: String?): Boolean {
                    return true
                }
    
            })
        }
    
        private fun setupRecyclerView() {
            binding.apply {
                recyclerView.apply {
                    setHasFixedSize(true)
                    itemAnimator = null
                    adapter = photoAdapter.withLoadStateHeaderAndFooter(
                        header = GalleryLoadStatesAdapter { photoAdapter.retry() },
                        footer = GalleryLoadStatesAdapter { photoAdapter.retry() }
                    )
                }
            }
    
            photoAdapter.addLoadStateListener { loadStates ->
                binding.apply {
                    progressBar.isVisible = loadStates.source.refresh is LoadState.Loading
                    recyclerView.isVisible = loadStates.source.refresh is LoadState.NotLoading
                    textViewError.isVisible = loadStates.source.refresh is LoadState.Error
                    buttonRetry.isVisible = loadStates.source.refresh is LoadState.Error
    
                    if (loadStates.source.refresh is LoadState.NotLoading &&
                        loadStates.append.endOfPaginationReached
                        && photoAdapter.itemCount == 0
                    ) {
                        recyclerView.isVisible = false
                        textViewEmpty.isVisible = true
                    } else {
                        textViewEmpty.isVisible = false
                    }
    
                }
            }
    
    
        }
    
        override fun onItemClick(photo: UnsplashPhoto) {
            val action = GalleryFragmentDirections.actionGalleryFragmentToDetailFragment(photo)
            findNavController().navigate(action)
        }
    
        override fun onStart() {
            super.onStart()
    
            viewLifecycleOwner.lifecycleScope.launchWhenStarted {
                lastPreference.readLastQuery().collectLatest {
                        updateQueryData(it)
                }
            }
    
        }
    
        override fun onStop() {
            super.onStop()
    //        Log.d("GalleryFragment", "onStop: $queryUpdate")
    
            //saving Query
            viewLifecycleOwner.lifecycleScope.launchWhenStarted {
                lastPreference.saveLastQuery(queryUpdate)
            }
        }
    
    
    
    }

このクラスでは、データストア設定を使用してデータを保存および読み取ります

コトリン

    @Singleton
    class LastPreference @Inject constructor(@ApplicationContext val context: Context) {
    
        companion object {
            val CURRENT_QUERY_KEY = preferencesKey<String>("current_query")
            private const val DEFAULT_QUERY = "cats"
        }
    
        private val dataStore = context.createDataStore("user_preferences")
    
        suspend fun saveLastQuery(query: String) {
            dataStore.edit {
                it[CURRENT_QUERY_KEY] = query
            }
        }
    
        fun readLastQuery() = dataStore.data
            .catch { e ->
                Log.d("LastPreference", "readLastQuery: ${e.message} ")
    
            }.map {
                it[CURRENT_QUERY_KEY] ?: DEFAULT_QUERY
            }
    
    }