新增夜间模式相关代码

lib/main.dart

@@ -1,11 +1,14 @@
 import 'package:flutter/material.dart';
 import 'pages/battery_health_page.dart';
 import 'services/saf_storage_service.dart';
+import 'theme/app_colors.dart';
+import 'theme/theme_service.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
   await SafStorageService().init();
+  await ThemeService.init(); // 🆕
 
   runApp(const MyApp());
 }
@@ -15,53 +18,60 @@ class MyApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      title: '电池健康度',
-      theme: ThemeData(
-        // 🟢 中文用 HarmonyOS Sans SC
-        fontFamily: 'HarmonyOS_Sans_SC',
-        // 🟢 数字回退到 FlymeFont
-        fontFamilyFallback: const ['Flyme'],
-        // 🟢 统一文字颜色为黑色
-        colorScheme: ColorScheme.fromSeed(
-          seedColor: const Color(0xFFFFFFFF),
-        ).copyWith(onSurface: Colors.black),
-        textTheme: const TextTheme(
-          // 大标题/数字（健康度、容量等）
-          displayMedium: TextStyle(
-            fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
-            color: Colors.black,
-          ),
-          // 标题（如“容量百分比变动趋势”）
-          headlineMedium: TextStyle(
-            fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
-            color: Colors.black,
-          ),
-          // 正文（电压、温度、循环次数等）
-          bodyMedium: TextStyle(
-            fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
-            color: Colors.black,
-          ),
-          // 小字（日期、辅助信息）
-          bodySmall: TextStyle(
-            fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
-            color: Colors.black87,
-          ),
-          // 数字专用（大号数字，如健康度百分比）
-          displayLarge: TextStyle(
-            fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
-            color: Colors.black,
-          ),
+    return ValueListenableBuilder<ThemeMode>(
+      valueListenable: ThemeService.notifier,
+      builder: (context, mode, _) {
+        return MaterialApp(
+          title: '电池健康度',
+          themeMode: mode,
+          theme: _buildTheme(Brightness.light, kLightColors),
+          darkTheme: _buildTheme(Brightness.dark, kDarkColors),
+          home: const BatteryHealthPage(),
+          debugShowCheckedModeBanner: false,
+        );
+      },
+    );
+  }
+
+  ThemeData _buildTheme(Brightness brightness, AppColors colors) {
+    return ThemeData(
+      useMaterial3: true,
+      brightness: brightness,
+      scaffoldBackgroundColor: colors.background,
+      fontFamily: 'HarmonyOS_Sans_SC',
+      fontFamilyFallback: const ['Flyme'],
+      colorScheme: ColorScheme.fromSeed(
+        seedColor: colors.background,
+        brightness: brightness,
+      ),
+      extensions: [colors], // 🆕 注册 ThemeExtension
+      textTheme: TextTheme(
+        displayMedium: TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontFamilyFallback: const ['Flyme'],
+          color: colors.textPrimary,
         ),
-        useMaterial3: true,
+        headlineMedium: TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontFamilyFallback: const ['Flyme'],
+          color: colors.textPrimary,
+        ),
+        bodyMedium: TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontFamilyFallback: const ['Flyme'],
+          color: colors.textPrimary,
+        ),
+        bodySmall: TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontFamilyFallback: const ['Flyme'],
+          color: colors.textSecondary,
+        ),
+        displayLarge: TextStyle(
+          fontFamily: 'HarmonyOS_Sans_SC',
+          fontFamilyFallback: const ['Flyme'],
+          color: colors.textPrimary,
+        ),
       ),
-      home: const BatteryHealthPage(),
-      debugShowCheckedModeBanner: false,
     );
   }
 }