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(
+    return ValueListenableBuilder<ThemeMode>(
-      title: '电池健康度',
+      valueListenable: ThemeService.notifier,
-      theme: ThemeData(
+      builder: (context, mode, _) {
-        // 🟢 中文用 HarmonyOS Sans SC
+        return MaterialApp(
-        fontFamily: 'HarmonyOS_Sans_SC',
+          title: '电池健康度',
-        // 🟢 数字回退到 FlymeFont
+          themeMode: mode,
-        fontFamilyFallback: const ['Flyme'],
+          theme: _buildTheme(Brightness.light, kLightColors),
-        // 🟢 统一文字颜色为黑色
+          darkTheme: _buildTheme(Brightness.dark, kDarkColors),
-        colorScheme: ColorScheme.fromSeed(
+          home: const BatteryHealthPage(),
-          seedColor: const Color(0xFFFFFFFF),
+          debugShowCheckedModeBanner: false,
-        ).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'],
+  ThemeData _buildTheme(Brightness brightness, AppColors colors) {
-            color: Colors.black,
+    return ThemeData(
-          ),
+      useMaterial3: true,
-          // 标题（如“容量百分比变动趋势”）
+      brightness: brightness,
-          headlineMedium: TextStyle(
+      scaffoldBackgroundColor: colors.background,
-            fontFamily: 'HarmonyOS_Sans_SC',
+      fontFamily: 'HarmonyOS_Sans_SC',
-            fontFamilyFallback: ['Flyme'],
+      fontFamilyFallback: const ['Flyme'],
-            color: Colors.black,
+      colorScheme: ColorScheme.fromSeed(
-          ),
+        seedColor: colors.background,
-          // 正文（电压、温度、循环次数等）
+        brightness: brightness,
-          bodyMedium: TextStyle(
+      ),
-            fontFamily: 'HarmonyOS_Sans_SC',
+      extensions: [colors], // 🆕 注册 ThemeExtension
-            fontFamilyFallback: ['Flyme'],
+      textTheme: TextTheme(
-            color: Colors.black,
+        displayMedium: TextStyle(
-          ),
+          fontFamily: 'HarmonyOS_Sans_SC',
-          // 小字（日期、辅助信息）
+          fontFamilyFallback: const ['Flyme'],
-          bodySmall: TextStyle(
+          color: colors.textPrimary,
-            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,
-          ),
         ),
-        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,
     );
   }
 }

lib/pages/battery_health_page.dart

@@ -3,6 +3,7 @@ import 'dart:developer' as dev;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:device_info_plus/device_info_plus.dart';
+import '../theme/theme_service.dart';
 
 // --- 本地导入 ---
 import '../models/device_matching.dart';
@@ -626,6 +627,56 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
     return ChargeUtils.getChargeTypeLabel(_isWireless, _chargeType);
   }
 
+  // 🆕 夜间模式切换弹窗  ← 加在这里
+  void _showThemePicker() {
+    showModalBottomSheet(
+      context: context,
+      builder: (ctx) {
+        final current = ThemeService.notifier.value;
+        return SafeArea(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              ListTile(
+                leading: const Icon(Icons.brightness_auto),
+                title: const Text('跟随系统'),
+                trailing: current == ThemeMode.system
+                    ? const Icon(Icons.check)
+                    : null,
+                onTap: () {
+                  ThemeService.setMode(ThemeMode.system);
+                  Navigator.pop(ctx);
+                },
+              ),
+              ListTile(
+                leading: const Icon(Icons.light_mode),
+                title: const Text('浅色'),
+                trailing: current == ThemeMode.light
+                    ? const Icon(Icons.check)
+                    : null,
+                onTap: () {
+                  ThemeService.setMode(ThemeMode.light);
+                  Navigator.pop(ctx);
+                },
+              ),
+              ListTile(
+                leading: const Icon(Icons.dark_mode),
+                title: const Text('深色'),
+                trailing: current == ThemeMode.dark
+                    ? const Icon(Icons.check)
+                    : null,
+                onTap: () {
+                  ThemeService.setMode(ThemeMode.dark);
+                  Navigator.pop(ctx);
+                },
+              ),
+            ],
+          ),
+        );
+      },
+    );
+  }
+
   // ---------- Build ----------
   @override
   Widget build(BuildContext context) {
@@ -695,7 +746,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
                     );
                     break;
                   case 'dark_mode':
-                    // 夜间模式切换逻辑（1.7.0 再实现）
+                    _showThemePicker();
                     break;
                 }
               },
@@ -705,11 +756,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
                   value: 'about', // 🟢 新增
                   child: Text('关于'),
                 ),
-                const PopupMenuItem(
+                const PopupMenuItem(value: 'dark_mode', child: Text('夜间模式')),
-                  value: 'dark_mode',
-                  enabled: false, // 暂时灰显
-                  child: Text('夜间模式（开发中）'),
-                ),
               ],
             ),
           ],

lib/theme/app_colors.dart

@@ -0,0 +1,164 @@
+import 'package:flutter/material.dart';
+
+@immutable
+class AppColors extends ThemeExtension<AppColors> {
+  final Color background; // 页面背景
+  final Color surface; // 卡片/面板背景
+  final Color textPrimary; // 主文字
+  final Color textSecondary; // 次要文字
+  final Color textTertiary; // 弱化文字
+  final Color divider; // 分割线
+  final Color icon; // 图标色
+
+  final Color healthGreen; // 健康度 ≥80%
+  final Color healthYellow; // 70~80%
+  final Color healthOrange;
+  final Color healthRed; // <70% 或异常
+  final Color barEmpty; // 无数据柱
+
+  final Color voltUp; // 电压↑
+  final Color voltDown; // 电压↓
+  final Color tempUp;
+  final Color tempDown;
+
+  final Color progressBar; // 更新日志进度条
+  final Color statusBarTint; // 状态栏背景
+
+  const AppColors({
+    required this.background,
+    required this.surface,
+    required this.textPrimary,
+    required this.textSecondary,
+    required this.textTertiary,
+    required this.divider,
+    required this.icon,
+    required this.healthGreen,
+    required this.healthYellow,
+    required this.healthOrange,
+    required this.healthRed,
+    required this.barEmpty,
+    required this.voltUp,
+    required this.voltDown,
+    required this.tempUp,
+    required this.tempDown,
+    required this.progressBar,
+    required this.statusBarTint,
+  });
+
+  @override
+  AppColors copyWith({
+    Color? background,
+    Color? surface,
+    Color? textPrimary,
+    Color? textSecondary,
+    Color? textTertiary,
+    Color? divider,
+    Color? icon,
+    Color? healthGreen,
+    Color? healthYellow,
+    Color? healthOrange,
+    Color? healthRed,
+    Color? barEmpty,
+    Color? voltUp,
+    Color? voltDown,
+    Color? tempUp,
+    Color? tempDown,
+    Color? progressBar,
+    Color? statusBarTint,
+  }) {
+    return AppColors(
+      background: background ?? this.background,
+      surface: surface ?? this.surface,
+      textPrimary: textPrimary ?? this.textPrimary,
+      textSecondary: textSecondary ?? this.textSecondary,
+      textTertiary: textTertiary ?? this.textTertiary,
+      divider: divider ?? this.divider,
+      icon: icon ?? this.icon,
+      healthGreen: healthGreen ?? this.healthGreen,
+      healthYellow: healthYellow ?? this.healthYellow,
+      healthOrange: healthOrange ?? this.healthOrange,
+      healthRed: healthRed ?? this.healthRed,
+      barEmpty: barEmpty ?? this.barEmpty,
+      voltUp: voltUp ?? this.voltUp,
+      voltDown: voltDown ?? this.voltDown,
+      tempUp: tempUp ?? this.tempUp,
+      tempDown: tempDown ?? this.tempDown,
+      progressBar: progressBar ?? this.progressBar,
+      statusBarTint: statusBarTint ?? this.statusBarTint,
+    );
+  }
+
+  @override
+  AppColors lerp(ThemeExtension<AppColors>? other, double t) {
+    if (other is! AppColors) return this;
+    return AppColors(
+      background: Color.lerp(background, other.background, t)!,
+      surface: Color.lerp(surface, other.surface, t)!,
+      textPrimary: Color.lerp(textPrimary, other.textPrimary, t)!,
+      textSecondary: Color.lerp(textSecondary, other.textSecondary, t)!,
+      textTertiary: Color.lerp(textTertiary, other.textTertiary, t)!,
+      divider: Color.lerp(divider, other.divider, t)!,
+      icon: Color.lerp(icon, other.icon, t)!,
+      healthGreen: Color.lerp(healthGreen, other.healthGreen, t)!,
+      healthYellow: Color.lerp(healthYellow, other.healthYellow, t)!,
+      healthOrange: Color.lerp(healthOrange, other.healthOrange, t)!,
+      healthRed: Color.lerp(healthRed, other.healthRed, t)!,
+      barEmpty: Color.lerp(barEmpty, other.barEmpty, t)!,
+      voltUp: Color.lerp(voltUp, other.voltUp, t)!,
+      voltDown: Color.lerp(voltDown, other.voltDown, t)!,
+      tempUp: Color.lerp(tempUp, other.tempUp, t)!,
+      tempDown: Color.lerp(tempDown, other.tempDown, t)!,
+      progressBar: Color.lerp(progressBar, other.progressBar, t)!,
+      statusBarTint: Color.lerp(statusBarTint, other.statusBarTint, t)!,
+    );
+  }
+}
+
+/// 浅色主题（保持现有视觉）
+const AppColors kLightColors = AppColors(
+  background: Colors.white,
+  surface: Color(0xFFF0F4F8),
+  textPrimary: Colors.black,
+  textSecondary: Color(0xFF5F5F5F),
+  textTertiary: Colors.grey,
+  divider: Color(0xFFE0E0E0),
+  icon: Colors.black,
+  healthGreen: Color(0xFF00B140),
+  healthYellow: Color(0xFFEFDF00),
+  healthOrange: Color(0xFFD75A16),
+  healthRed: Colors.red,
+  barEmpty: Color(0xFFE0E0E0),
+  voltUp: Colors.red,
+  voltDown: Colors.blue,
+  tempUp: Colors.red,
+  tempDown: Colors.blue,
+  progressBar: Color.fromRGBO(157, 212, 237, 1.0),
+  statusBarTint: Color.fromRGBO(157, 212, 237, 0.1),
+);
+
+/// 深色主题（色相保留，明度调整）
+const AppColors kDarkColors = AppColors(
+  background: Color(0xFF121212),
+  surface: Color(0xFF1E1E1E),
+  textPrimary: Color(0xFFE8E8E8),
+  textSecondary: Color(0xFFA0A0A0),
+  textTertiary: Color(0xFF707070),
+  divider: Color(0xFF2A2A2A),
+  icon: Color(0xFFE8E8E8),
+  healthGreen: Color(0xFF00D14D),
+  healthYellow: Color(0xFFD4C520),
+  healthOrange: Color(0xFFFF7838),
+  healthRed: Color(0xFFFF5252),
+  barEmpty: Color(0xFF2A2A2A),
+  voltUp: Color(0xFFFF5252),
+  voltDown: Color(0xFF5AA9FF),
+  tempUp: Color(0xFFFF5252),
+  tempDown: Color(0xFF5AA9FF),
+  progressBar: Color(0xFF5A9BBD),
+  statusBarTint: Color(0xFF121212),
+);
+
+/// 便捷扩展：context.colors.textPrimary
+extension AppColorsX on BuildContext {
+  AppColors get colors => Theme.of(this).extension<AppColors>()!;
+}

lib/theme/theme_service.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class ThemeService {
+  static const _prefKey = 'theme_mode';
+  static final ValueNotifier<ThemeMode> notifier = ValueNotifier(
+    ThemeMode.system,
+  );
+
+  /// 启动时调用（main.dart）
+  static Future<void> init() async {
+    final prefs = await SharedPreferences.getInstance();
+    final saved = prefs.getString(_prefKey);
+    notifier.value = _parse(saved);
+  }
+
+  /// 菜单里调用
+  static Future<void> setMode(ThemeMode mode) async {
+    notifier.value = mode;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_prefKey, _name(mode));
+  }
+
+  static ThemeMode _parse(String? s) {
+    switch (s) {
+      case 'light':
+        return ThemeMode.light;
+      case 'dark':
+        return ThemeMode.dark;
+      default:
+        return ThemeMode.system;
+    }
+  }
+
+  static String _name(ThemeMode m) {
+    switch (m) {
+      case ThemeMode.light:
+        return 'light';
+      case ThemeMode.dark:
+        return 'dark';
+      case ThemeMode.system:
+        return 'system';
+    }
+  }
+}