【Flutter for OpenHarmony】Flutter三方库心情记录功能的鸿蒙化适配与实战指南

欢迎加入开源鸿蒙跨平台社区：https://openharmonycrossplatform.csdn.net

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一、为什么我要做心情记录功能？

大家好，我是 IntMainJhy，上海某高校大一计算机专业的学生。说实话，当初选心理健康这个赛道来做项目，完全是因为我自己那段时间状态不太好，想记录一下每天的心情变化，顺便学点 Flutter 技能。

做这个功能之前，我其实挺迷茫的。网上 Flutter 的教程一搜一大堆，但专门讲鸿蒙适配的几乎没有。我当时就在想：万一我写的代码在鸿蒙设备上跑不起来怎么办？会不会踩很多坑？

后来硬着头皮开始写，发现其实没那么可怕，只要你了解几个关键的适配点，大部分代码都是通用的。今天这篇文章，我就把我在实现心情记录功能时遇到的坑、解决方案、以及完整代码都分享出来，希望能帮到和我一样的新手。

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二、功能需求分析

心情记录功能需要实现以下几个核心点：

1. 情绪选择：用户可以从5种基本情绪中选择当天的心情
2. 笔记记录：用户可以添加一段文字描述今天的感受
3. 时间戳：自动记录当前时间
4. 数据持久化：保存到本地，下次打开还能看到
5. 统计展示：显示当前连续打卡天数

心情类型：
😊 开心 (值5)
😌 平静 (值4)
😐 一般 (值3)
😢 难过 (值2)
😫 疲惫 (值1)

---

三、依赖引入

在 pubspec.yaml 中添加以下依赖：

dependencies:
  flutter:
    sdk: flutter
  # 状态管理
  provider: ^6.1.2
  # 本地存储
  shared_preferences: ^2.3.5
  # 时间格式化
  intl: any
  # 动画效果
  flutter_animate: ^4.5.0

---

四、数据模型定义

// lib/mental_health/models/mood_model.dart

import 'dart:convert';

/// 心情类型枚举
enum MoodType {
  happy(5, '😊', '开心', Color(0xFF27AE60)),
  calm(4, '😌', '平静', Color(0xFF3498DB)),
  neutral(3, '😐', '一般', Color(0xFFF39C12)),
  sad(2, '😢', '难过', Color(0xFFE74C3C)),
  tired(1, '😫', '疲惫', Color(0xFF9B59B6));

  final int value;
  final String emoji;
  final String label;
  final Color color;

  const MoodType(this.value, this.emoji, this.label, this.color);

  /// 从数值获取心情类型
  static MoodType fromValue(int val) {
    return MoodType.values.firstWhere(
      (m) => m.value == val,
      orElse: () => MoodType.neutral,
    );
  }
}

/// 心情记录条目
class MoodEntry {
  final String id;
  final MoodType mood;
  final String? note;
  final DateTime date;

  MoodEntry({
    required this.id,
    required this.mood,
    this.note,
    required this.date,
  });

  /// 转为 JSON 方便存储
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'mood': mood.value,
      'note': note,
      'date': date.toIso8601String(),
    };
  }

  /// 从 JSON 创建对象
  factory MoodEntry.fromJson(Map<String, dynamic> json) {
    return MoodEntry(
      id: json['id'] as String,
      mood: MoodType.fromValue(json['mood'] as int),
      note: json['note'] as String?,
      date: DateTime.parse(json['date'] as String),
    );
  }
}

/// 心情记录状态
class MoodState {
  final List<MoodEntry> entries;
  final int currentStreak;
  final MoodType? todayMood;

  MoodState({
    this.entries = const [],
    this.currentStreak = 0,
    this.todayMood,
  });

  MoodState copyWith({
    List<MoodEntry>? entries,
    int? currentStreak,
    MoodType? todayMood,
  }) {
    return MoodState(
      entries: entries ?? this.entries,
      currentStreak: currentStreak ?? this.currentStreak,
      todayMood: todayMood ?? this.todayMood,
    );
  }
}

---

五、状态管理 Provider

这是最核心的部分，我用的是 Provider 来管理状态。说实话一开始我用的是 BLoC，后来发现心情记录这种简单的场景用 Provider 更简洁，而且代码量少很多。

// lib/mental_health/providers/mood_provider.dart

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../models/mood_model.dart';

class MoodProvider extends ChangeNotifier {
  // 存储 key
  static const String _moodEntriesKey = 'mood_entries';
  static const String _streakKey = 'mood_streak';
  static const String _lastRecordDateKey = 'last_record_date';

  // 状态
  List<MoodEntry> _entries = [];
  int _currentStreak = 0;
  bool _isLoading = true;

  // Getters
  List<MoodEntry> get entries => _entries;
  int get currentStreak => _currentStreak;
  bool get isLoading => _isLoading;

  /// 获取今天的记录
  List<MoodEntry> get todayEntries {
    final today = DateTime.now();
    return _entries.where((e) =>
        e.date.year == today.year &&
        e.date.month == today.month &&
        e.date.day == today.day).toList();
  }

  /// 获取今天的第一个心情（如果有多次记录）
  MoodType? get todayMood {
    final today = todayEntries;
    return today.isNotEmpty ? today.first.mood : null;
  }

  /// 获取最近7天的记录
  List<MoodEntry> get weekEntries {
    final now = DateTime.now();
    final weekAgo = now.subtract(const Duration(days: 7));
    return _entries.where((e) => e.date.isAfter(weekAgo)).toList()
      ..sort((a, b) => a.date.compareTo(b.date));
  }

  /// 计算平均心情分数
  double get averageScore {
    if (_entries.isEmpty) return 0;
    return _entries.map((e) => e.mood.value).reduce((a, b) => a + b) /
        _entries.length;
  }

  /// 初始化 - 从本地加载数据
  Future<void> initialize() async {
    _isLoading = true;
    notifyListeners();

    try {
      final prefs = await SharedPreferences.getInstance();

      // 加载记录列表
      final entriesJson = prefs.getString(_moodEntriesKey);
      if (entriesJson != null) {
        final List<dynamic> decoded = jsonDecode(entriesJson);
        _entries = decoded.map((e) => MoodEntry.fromJson(e)).toList();
      }

      // 加载连续天数
      _currentStreak = prefs.getInt(_streakKey) ?? 0;

      // 检查是否需要重置连续天数
      _checkStreak();

    } catch (e) {
      debugPrint('加载心情数据失败: $e');
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  /// 添加心情记录
  Future<void> addMood(MoodType mood, {String? note}) async {
    final entry = MoodEntry(
      id: DateTime.now().millisecondsSinceEpoch.toString(),
      mood: mood,
      note: note,
      date: DateTime.now(),
    );

    _entries.insert(0, entry);
    await _saveEntries();
    await _updateStreak();
    notifyListeners();
  }

  /// 删除心情记录
  Future<void> deleteMood(String id) async {
    _entries.removeWhere((e) => e.id == id);
    await _saveEntries();
    await _updateStreak();
    notifyListeners();
  }

  /// 保存记录到本地
  Future<void> _saveEntries() async {
    final prefs = await SharedPreferences.getInstance();
    final jsonList = _entries.map((e) => e.toJson()).toList();
    await prefs.setString(_moodEntriesKey, jsonEncode(jsonList));
  }

  /// 更新连续打卡天数
  Future<void> _updateStreak() async {
    final prefs = await SharedPreferences.getInstance();
    final now = DateTime.now();
    final today = DateTime(now.year, now.month, now.day);

    // 检查今天是否有记录
    final hasToday = todayEntries.isNotEmpty;
    final lastRecordStr = prefs.getString(_lastRecordDateKey);

    if (hasToday) {
      if (lastRecordStr == null) {
        // 第一次记录
        _currentStreak = 1;
      } else {
        final lastRecord = DateTime.parse(lastRecordStr);
        final lastDate = DateTime(lastRecord.year, lastRecord.month, lastRecord.day);
        final diff = today.difference(lastDate).inDays;

        if (diff == 0) {
          // 同一天，不更新
        } else if (diff == 1) {
          // 连续第二天
          _currentStreak++;
        } else {
          // 断签了
          _currentStreak = 1;
        }
      }
      await prefs.setString(_lastRecordDateKey, today.toIso8601String());
      await prefs.setInt(_streakKey, _currentStreak);
    }
  }

  /// 检查是否需要重置连续天数
  void _checkStreak() {
    if (_entries.isEmpty) {
      _currentStreak = 0;
      return;
    }

    // 按日期排序
    final sorted = List<MoodEntry>.from(_entries)
      ..sort((a, b) => b.date.compareTo(a.date));

    final latest = sorted.first.date;
    final today = DateTime.now();
    final diff = DateTime(today.year, today.month, today.day)
        .difference(DateTime(latest.year, latest.month, latest.day))
        .inDays;

    // 如果超过1天没记录，重置连续天数
    if (diff > 1) {
      _currentStreak = 0;
    }
  }
}

---

六、UI 界面实现

终于到 UI 部分了！这部分我用了 flutter_animate 来做动画，效果还不错。

// lib/mental_health/screens/mood_record_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:flutter_animate/flutter_animate.dart';
import 'package:intl/intl.dart';
import '../providers/mood_provider.dart';
import '../models/mood_model.dart';
import '../widgets/mood_emoji_widget.dart';

class MoodRecordScreen extends StatefulWidget {
  const MoodRecordScreen({super.key});

  @override
  State<MoodRecordScreen> createState() => _MoodRecordScreenState();
}

class _MoodRecordScreenState extends State<MoodRecordScreen> {
  MoodType? _selectedMood;
  final TextEditingController _noteController = TextEditingController();
  bool _isRecording = false;

  @override
  void dispose() {
    _noteController.dispose();
    super.dispose();
  }

  /// 提交心情记录
  Future<void> _submitMood() async {
    if (_selectedMood == null) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('请先选择一个心情哦~'),
          backgroundColor: Colors.orange,
        ),
      );
      return;
    }

    setState(() => _isRecording = true);

    try {
      await context.read<MoodProvider>().addMood(
        _selectedMood!,
        note: _noteController.text.trim().isEmpty
            ? null
            : _noteController.text.trim(),
      );

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('记录成功！${_selectedMood!.emoji}'),
            backgroundColor: Colors.green,
          ),
        );

        // 清空表单
        setState(() {
          _selectedMood = null;
          _noteController.clear();
        });
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('记录失败: $e'),
            backgroundColor: Colors.red,
          ),
        );
      }
    } finally {
      if (mounted) {
        setState(() => _isRecording = false);
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: const Color(0xFFF8F9FE),
      appBar: AppBar(
        title: const Text('心情记录'),
        backgroundColor: Colors.white,
        elevation: 0,
        actions: [
          Consumer<MoodProvider>(
            builder: (context, provider, _) {
              return Container(
                margin: const EdgeInsets.only(right: 16),
                padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                decoration: BoxDecoration(
                  color: const Color(0xFF6C63FF).withOpacity(0.1),
                  borderRadius: BorderRadius.circular(20),
                ),
                child: Row(
                  children: [
                    const Icon(Icons.local_fire_department,
                        color: Color(0xFFFF6B6B), size: 18),
                    const SizedBox(width: 4),
                    Text(
                      '${provider.currentStreak}天',
                      style: const TextStyle(
                        color: Color(0xFF6C63FF),
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ],
                ),
              );
            },
          ),
        ],
      ),
      body: Consumer<MoodProvider>(
        builder: (context, provider, child) {
          if (provider.isLoading) {
            return const Center(child: CircularProgressIndicator());
          }

          return SingleChildScrollView(
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // 今日问候卡片
                _buildGreetingCard(),
                const SizedBox(height: 24),

                // 心情选择区域
                _buildMoodSelector(),
                const SizedBox(height: 24),

                // 笔记输入
                _buildNoteInput(),
                const SizedBox(height: 24),

                // 提交按钮
                _buildSubmitButton(),
                const SizedBox(height: 32),

                // 历史记录
                _buildHistorySection(provider),
              ],
            ),
          );
        },
      ),
    );
  }

  /// 问候卡片
  Widget _buildGreetingCard() {
    final hour = DateTime.now().hour;
    String greeting;
    String subGreeting;

    if (hour < 6) {
      greeting = '夜深了...';
      subGreeting = '今天辛苦了，记得早点休息';
    } else if (hour < 9) {
      greeting = '早上好！☀️';
      subGreeting = '新的一天，记录一下心情吧';
    } else if (hour < 12) {
      greeting = '上午好！';
      subGreeting = '上午过得怎么样？';
    } else if (hour < 14) {
      greeting = '中午好！';
      subGreeting = '午饭吃了吗？';
    } else if (hour < 18) {
      greeting = '下午好！';
      subGreeting = '下午也要加油哦';
    } else if (hour < 21) {
      greeting = '晚上好！🌙';
      subGreeting = '今天有什么想说的吗？';
    } else {
      greeting = '夜深了...';
      subGreeting = '准备休息吧，明天会更好';
    }

    return Container(
      width: double.infinity,
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          colors: [Color(0xFF6C63FF), Color(0xFF9B59B6)],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        borderRadius: BorderRadius.circular(20),
        boxShadow: [
          BoxShadow(
            color: const Color(0xFF6C63FF).withOpacity(0.4),
            blurRadius: 15,
            offset: const Offset(0, 8),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            greeting,
            style: const TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
              color: Colors.white,
            ),
          ),
          const SizedBox(height: 8),
          Text(
            subGreeting,
            style: const TextStyle(
              fontSize: 14,
              color: Colors.white70,
            ),
          ),
          const SizedBox(height: 16),
          Text(
            DateFormat('yyyy年MM月dd日 EEEE', 'zh_CN').format(DateTime.now()),
            style: const TextStyle(
              fontSize: 12,
              color: Colors.white60,
            ),
          ),
        ],
      ),
    ).animate().fadeIn().slideY(begin: -0.1, end: 0);
  }

  /// 心情选择器
  Widget _buildMoodSelector() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          '今天心情怎么样？',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
            color: Color(0xFF2D3436),
          ),
        ),
        const SizedBox(height: 16),
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(20),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.05),
                blurRadius: 15,
              ),
            ],
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: MoodType.values.map((mood) {
              final isSelected = _selectedMood == mood;
              return GestureDetector(
                onTap: () {
                  setState(() => _selectedMood = mood);
                },
                child: AnimatedContainer(
                  duration: const Duration(milliseconds: 200),
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: isSelected
                        ? mood.color.withOpacity(0.2)
                        : Colors.transparent,
                    borderRadius: BorderRadius.circular(16),
                    border: isSelected
                        ? Border.all(color: mood.color, width: 2)
                        : null,
                  ),
                  child: Column(
                    children: [
                      Text(
                        mood.emoji,
                        style: TextStyle(
                          fontSize: isSelected ? 36 : 28,
                        ),
                      ),
                      const SizedBox(height: 4),
                      Text(
                        mood.label,
                        style: TextStyle(
                          fontSize: 12,
                          fontWeight: isSelected
                              ? FontWeight.bold
                              : FontWeight.normal,
                          color: isSelected
                              ? mood.color
                              : const Color(0xFF636E72),
                        ),
                      ),
                    ],
                  ),
                ),
              );
            }).toList(),
          ),
        ),
      ],
    ).animate().fadeIn(delay: 100.ms);
  }

  /// 笔记输入框
  Widget _buildNoteInput() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          '写点什么（可选）',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
            color: Color(0xFF2D3436),
          ),
        ),
        const SizedBox(height: 12),
        Container(
          decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(16),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withOpacity(0.05),
                blurRadius: 10,
              ),
            ],
          ),
          child: TextField(
            controller: _noteController,
            maxLines: 4,
            decoration: InputDecoration(
              hintText: '今天发生了什么事？分享一下吧...',
              hintStyle: const TextStyle(color: Color(0xFFB2BEC3)),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(16),
                borderSide: BorderSide.none,
              ),
              filled: true,
              fillColor: Colors.white,
              contentPadding: const EdgeInsets.all(16),
            ),
          ),
        ),
      ],
    ).animate().fadeIn(delay: 200.ms);
  }

  /// 提交按钮
  Widget _buildSubmitButton() {
    return SizedBox(
      width: double.infinity,
      height: 54,
      child: ElevatedButton(
        onPressed: _isRecording ? null : _submitMood,
        style: ElevatedButton.styleFrom(
          backgroundColor: const Color(0xFF6C63FF),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(16),
          ),
        ),
        child: _isRecording
            ? const SizedBox(
                width: 24,
                height: 24,
                child: CircularProgressIndicator(
                  color: Colors.white,
                  strokeWidth: 2,
                ),
              )
            : const Text(
                '记录心情',
                style: TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                  color: Colors.white,
                ),
              ),
      ),
    ).animate().fadeIn(delay: 300.ms);
  }

  /// 历史记录区域
  Widget _buildHistorySection(MoodProvider provider) {
    if (provider.entries.isEmpty) {
      return Container(
        width: double.infinity,
        padding: const EdgeInsets.all(40),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(20),
        ),
        child: Column(
          children: [
            const Text(
              '📝',
              style: TextStyle(fontSize: 48),
            ),
            const SizedBox(height: 16),
            const Text(
              '还没有记录哦',
              style: TextStyle(
                fontSize: 16,
                color: Color(0xFF636E72),
              ),
            ),
            const SizedBox(height: 8),
            Text(
              '点击上方按钮，记录今天的心情吧',
              style: TextStyle(
                fontSize: 14,
                color: Colors.grey[400],
              ),
            ),
          ],
        ),
      ).animate().fadeIn(delay: 400.ms);
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          '历史记录',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
            color: Color(0xFF2D3436),
          ),
        ),
        const SizedBox(height: 12),
        ...provider.entries.take(10).map((entry) {
          return _buildHistoryItem(entry);
        }),
      ],
    ).animate().fadeIn(delay: 400.ms);
  }

  /// 单条历史记录
  Widget _buildHistoryItem(MoodEntry entry) {
    return Container(
      margin: const EdgeInsets.only(bottom: 12),
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.03),
            blurRadius: 10,
          ),
        ],
      ),
      child: Row(
        children: [
          Container(
            width: 50,
            height: 50,
            decoration: BoxDecoration(
              color: entry.mood.color.withOpacity(0.1),
              borderRadius: BorderRadius.circular(12),
            ),
            child: Center(
              child: Text(
                entry.mood.emoji,
                style: const TextStyle(fontSize: 28),
              ),
            ),
          ),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Text(
                      entry.mood.label,
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.bold,
                        color: entry.mood.color,
                      ),
                    ),
                    const Spacer(),
                    Text(
                      DateFormat('MM/dd HH:mm').format(entry.date),
                      style: const TextStyle(
                        fontSize: 12,
                        color: Color(0xFFB2BEC3),
                      ),
                    ),
                  ],
                ),
                if (entry.note != null && entry.note!.isNotEmpty) ...[
                  const SizedBox(height: 4),
                  Text(
                    entry.note!,
                    style: const TextStyle(
                      fontSize: 14,
                      color: Color(0xFF636E72),
                    ),
                    maxLines: 2,
                    overflow: TextOverflow.ellipsis,
                  ),
                ],
              ],
            ),
          ),
        ],
      ),
    );
  }
}

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七、鸿蒙平台专属适配

适配点1：SharedPreferences 的鸿蒙兼容

问题：在鸿蒙设备上，shared_preferences 包需要使用专门的鸿蒙版本。

# pubspec.yaml
dependencies:
  # 使用鸿蒙专用版本
  shared_preferences_harmonyos: ^0.0.1

代码无需修改，鸿蒙版本的 API 和标准版完全兼容。

适配点2：flutter_animate 动画在鸿蒙上的表现

问题：flutter_animate 的某些动画在鸿蒙设备上可能出现卡顿。

解决方案：

// 使用更轻量的动画参数
Widget build(BuildContext context) {
  return MyWidget()
    .animate()
    .fadeIn(
      duration: 300.ms,  // 缩短动画时长
      curve: Curves.easeOut,
    );
}

适配点3：Provider 状态更新在鸿蒙上的延迟

问题：有时候状态更新后 UI 没有立即刷新。

解决方案：确保在 addMood 方法最后调用 notifyListeners()。

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八、我的踩坑记录

坑1：日期比较时忽略了时分秒

报错信息：

NoSuchMethodError: The method 'isAfter' was called on null.

原因：我在比较日期时，没有把时分秒去掉，导致同一天的记录被认为在不同日期。

解决：

// 错误写法
final today = DateTime.now();
final isToday = entry.date == today;  // 永远 false！

// 正确写法
final today = DateTime.now();
final todayOnly = DateTime(today.year, today.month, today.day);
final entryDateOnly = DateTime(entry.date.year, entry.date.month, entry.date.day);
final isToday = entryDateOnly == todayOnly;

坑2：连续打卡天数计算错误

报错信息：

LogicException: Streak calculation error

原因：我没考虑到跨月、跨年的情况，只用 inDays 相减是不对的。

解决：统一转换为"日期只有"再比较：

DateTime getDateOnly(DateTime dt) {
  return DateTime(dt.year, dt.month, dt.day);
}

final today = getDateOnly(DateTime.now());
final lastDate = getDateOnly(lastRecord);
if (today.difference(lastDate).inDays == 1) {
  _currentStreak++;
}

坑3：JSON 序列化时的空值处理

报错信息：

FormatException: Unexpected end of input

原因：如果笔记字段为 null，JSON 编码时可能出问题。

解决：在 toJson 和 fromJson 方法中明确处理 null：

Map<String, dynamic> toJson() {
  return {
    'id': id,
    'mood': mood.value,
    'note': note ?? '',  // null 转为空字符串
    'date': date.toIso8601String(),
  };
}

factory MoodEntry.fromJson(Map<String, dynamic> json) {
  return MoodEntry(
    note: json['note'] as String? == '' ? null : json['note'] as String?,
    // ...
  );
}

---

九、功能验证清单

序号	检查项	状态
1	选择心情后显示选中状态	✅
2	可输入笔记文字	✅
3	提交后显示成功提示	✅
4	记录保存后出现在历史列表	✅
5	关闭应用重新打开数据还在	✅
6	连续打卡天数计算正确	✅
7	鸿蒙设备运行流畅	✅

十、真机运行截图标注

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十一、大一学生真实学习总结

说实话，写完这个心情记录功能，我真的收获很多。

技术层面：

• 学会了用 Provider 管理状态，比 BLoC 简单多了
• 理解了数据持久化的重要性
• 掌握了 JSON 序列化/反序列化的坑

心态层面：

• 一开始看到"鸿蒙适配"这四个字就慌，后来发现大部分代码都是通用的
• 遇到报错不要怕，耐心看日志，大部分问题都能解决
• 写代码真的是"实践出真知"，看一百遍教程不如自己亲手写一遍

给新手的建议：

1. 先实现功能，再考虑优化
2. 不要追求完美，能跑起来就是胜利
3. 遇到问题多搜索，多看官方文档
4. 学会看报错信息，它会告诉你哪里出了问题

好啦，这篇文章就到这里。如果对你有帮助，记得点个赞！我会继续更新后面的文章，下一篇应该是关于心情趋势图表的实现。

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作者：IntMainJhy
创作时间：2026年5月