以前的 Android 開發，常見的爭議話題是一個 Activity + 多個 Fragment 還是多個 Activity

一個 Activity + 多個 Fragment 對程式比較整潔，但是 Fragment 坑超多，頁面切換沒做好的話，連點就閃退

多個 Activity 對新手比較友好，但是就容易受到工程師鄙視鍊的攻擊

後來 Google 神仙下凡說你們都不用吵了，都使用使用一個 Activity + 多個 Fragment 再搭導航，一統天下，確實之後的頁面切換舒服很多

AI 寫扣經過

1. 加入 AllNotes 的路由定義

   sealed interface NavRoute {
       @Serializable
       data object AllNotes : NavRoute
   }
   

2. 建立 AllNotesScreen

   @OptIn(ExperimentalMaterial3Api::class)
   @Composable
   fun AllNotesScreen(
       modifier: Modifier = Modifier,
       uiState: NoteListUiState,
       onNavigateBack: () -> Unit,
       onNoteClick: (Long) -> Unit
   ) {
       Scaffold(
           modifier = modifier.fillMaxSize(),
           topBar = {
               TopAppBar(
                   title = { Text("全部筆記") },
                   navigationIcon = {
                       IconButton(onClick = onNavigateBack) {
                           Icon(
                               imageVector = Icons.AutoMirrored.Filled.ArrowBack,
                               contentDescription = "返回"
                           )
                       }
                   }
               )
           }
       ) { innerPadding ->
           LazyColumn(
               modifier = Modifier
                   .padding(innerPadding)
                   .fillMaxSize()
           ) {
               items(uiState.notes, key = { it.id }) { note ->
                   // We can reuse the NoteItem from NoteListScreen if we extract it.
                   // For now, let's just display the title.
                   Text(
                       text = note.title,
                       modifier = Modifier.padding(16.dp)
                   )
               }
           }
       }
   }
   

3. 更新 NavGraph.kt，將這個新的頁面註冊進去，並處理 NoteListScreen 和 AllNotesScreen 之間的資料傳遞

   @Composable
   fun AppNavGraph(
       modifier: Modifier = Modifier,
       navController: NavHostController,
       startDestination: NavRoute = NavRoute.Home
   ) {
       NavHost(
           navController = navController,
           startDestination = startDestination,
           modifier = modifier
       ) {
           // 筆記清單頁 (原首頁)
           composable<NavRoute.Home> {
               // Shared ViewModel
               val viewModel: NoteListViewModel = hiltViewModel()
               NoteListScreen(
                   viewModel = viewModel,
                   onNavigateToSettings = { navController.navigate(NavRoute.Settings) },
                   onNavigateToNoteDetail = { noteId ->
                       navController.navigate(NavRoute.Detail(noteId.toString()))
                   },
                   onNavigateToAllNotes = { navController.navigate(NavRoute.AllNotes) }
               )
           }
   
           // 全部筆記頁
           composable<NavRoute.AllNotes> {
               // Shared ViewModel
               val viewModel: NoteListViewModel = hiltViewModel(
                   navController.getBackStackEntry(NavRoute.Home)
               )
               val uiState by viewModel.uiState.collectAsState()
               AllNotesScreen(
                   uiState = uiState,
                   onNavigateBack = { navController.popBackStack() },
                   onNoteClick = { noteId ->
                       navController.navigate(NavRoute.Detail(noteId.toString()))
                   }
               )
           }
   
           // 詳情頁
           composable<NavRoute.Detail> {
               val detail = it.toRoute<NavRoute.Detail>()
               DetailScreen(
                   id = detail.id,
                   onNavigateBack = { navController.popBackStack() }
               )
           }
   
           // 設定頁
           composable<NavRoute.Settings> {
               SettingsScreen()
           }
       }
   }