多语言支持

lib/main.dart

@@ -1,10 +1,13 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'l10n/app_localizations.dart';
 import 'theme/app_theme.dart';
 import 'services/storage_service.dart';
 import 'services/encouragement_service.dart';
 import 'services/notification_service.dart';
 import 'screens/home_screen.dart';
 import 'screens/onboarding_screen.dart';
+import 'screens/settings_screen.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -39,11 +42,13 @@ class MyApp extends StatefulWidget {
 class _MyAppState extends State<MyApp> {
   bool _hasCompletedOnboarding = false;
   bool _isLoading = true;
+  Locale? _locale;
 
   @override
   void initState() {
     super.initState();
     _checkOnboardingStatus();
+    _loadSavedLocale();
   }
 
   Future<void> _checkOnboardingStatus() async {
@@ -54,12 +59,32 @@ class _MyAppState extends State<MyApp> {
     });
   }
 
+  Future<void> _loadSavedLocale() async {
+    final savedLocale = await SettingsScreen.getSavedLocale();
+    if (savedLocale != null) {
+      setState(() {
+        _locale = Locale(savedLocale);
+      });
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'FocusBuddy',
       debugShowCheckedModeBanner: false,
       theme: AppTheme.lightTheme,
+      locale: _locale,
+      localizationsDelegates: const [
+        AppLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: const [
+        Locale('en'),
+        Locale('zh'),
+      ],
       home: _isLoading
           ? const Scaffold(
               body: Center(