计算显示修好 输入字符长度限制和计算精度需要修复

android/gradle/wrapper/gradle-wrapper.properties

@@ -2,4 +2,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=file:///D:/Gradle/.gradle/wrapper/dists/gradle-7.5-all.zip
+distributionUrl=file:///C:/Users/24811/.gradle/wrapper/dists/gradle-7.5-all.zip

lib/pages/record_page.dart

@@ -18,7 +18,8 @@ class RecordPage extends StatefulWidget {
   State<RecordPage> createState() => _RecordPageState();
 }
 
-class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateMixin {
+class _RecordPageState extends State<RecordPage>
+    with SingleTickerProviderStateMixin {
   late TabController _tabController;
   String? _selectedCategoryId;
   String _note = '';
@@ -27,8 +28,8 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
   final _uuid = const Uuid();
   String _inputBuffer = '0.0'; // 用于显示的字符串
   String? _pendingOperation; // 等待执行的运算符
-  double? _pendingValue;        // 等待计算的第一个值
-  bool _isNewInput = true;      // 是否开始新的输入
+  String? _pendingValue; // 等待计算的第一个值
+  String? _inputValue; // 当前输入的值
 
   @override
   void initState() {
@@ -50,7 +51,6 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
       _selectedDate = widget.record!.createTime;
       // 设置输入缓冲区为当前金额的格式化字符串
       _inputBuffer = _formatNumberForDisplay(widget.record!.amount);
-      _isNewInput = false;
     } else {
       // 新建模式：默认选中第一个分类
       _selectedCategoryId = _currentCategories.first.id;
@@ -103,8 +103,13 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
 
   /// 格式化显示金额
   String get _displayAmount {
-    if (_pendingOperation != null && _pendingValue != null) {
-      return '$_pendingValue $_pendingOperation ${_isNewInput ? "" : _inputBuffer}';
+    if (_pendingOperation != null ||
+        _pendingValue != null ||
+        _inputValue != null) {
+      _inputBuffer =
+          '${_pendingValue ?? ""} ${_pendingOperation ?? ""} ${_inputValue ?? ""}';
+    } else {
+      _inputBuffer = '0.0';
     }
     return _inputBuffer;
   }
@@ -112,40 +117,25 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
   /// 处理数字输入
   void _handleNumber(String digit) {
     setState(() {
-      if (_isNewInput) {
-        // 新输入时直接替换
-        _inputBuffer = digit;
-        _isNewInput = false;
-      } else if (_inputBuffer == '0' && !_inputBuffer.contains('.')) {
-        // 当前是0且没有小数点时，直接替换0
-        _inputBuffer = digit;
-      } else if (_inputBuffer == '0.0') {
-        // 如果是默认状态，直接替换为新数字
-        _inputBuffer = digit;
-        _isNewInput = false;
+      if (_inputValue == '0' || _inputValue == null) {
+        // 当前是0
+        _inputValue = digit;
       } else {
         // 其他情况追加数字
-        _inputBuffer = _inputBuffer + digit;
+        _inputValue = _inputValue! + digit;
       }
-      _amount = double.parse(_inputBuffer);
     });
   }
 
   /// 处理小数点
   void _handleDecimal() {
     setState(() {
-      if (!_inputBuffer.contains('.')) {
-        // 如果是默认状态(0.0)或只有0，直接显示0.
-        if (_inputBuffer == '0.0' || _inputBuffer == '0') {
-          _inputBuffer = '0.';
-          _isNewInput = false;
-        } else {
-          // 其他数字直接加小数点
-          _inputBuffer = '$_inputBuffer.';
-        }
-      } else {
-        // 已有小数点时震动反馈
+      if (_inputValue == null || _inputValue == '0') {
+        _inputValue = '0.';
+      } else if (_inputValue!.contains('.')) {
         HapticFeedback.heavyImpact();
+      } else {
+        _inputValue = '$_inputValue.';
       }
     });
   }
@@ -153,84 +143,74 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
   /// 处理删除
   void _handleDelete() {
     setState(() {
-      if (_pendingOperation != null && !_isNewInput) {
-        // 删除第二个数字
-        if (_inputBuffer.length > 1) {
-          _inputBuffer = _inputBuffer.substring(0, _inputBuffer.length - 1);
-          if (_inputBuffer.isEmpty || _inputBuffer == '0') {
-            _inputBuffer = '0.0';
-            _isNewInput = true;
-          }
+      if (_inputValue != null) {
+        if(_inputValue!.length > 1){
+          _inputValue = _inputValue!.substring(0, _inputValue!.length - 1);
         }else{
-          _inputBuffer = '0.0';
-          _isNewInput = true;
+          _inputValue = null;
         }
       } else if (_pendingOperation != null) {
-        // 删除运算符
-        _inputBuffer = _pendingValue.toString();
         _pendingOperation = null;
+      } else if (_pendingValue != null) {
+        if(_pendingValue!.length > 1){
+          _pendingValue = _pendingValue!.substring(0, _pendingValue!.length - 1);
+        }else{
           _pendingValue = null;
-        _isNewInput = false;
-      } else {
-        // 删除普通数字
-        if (_inputBuffer.length > 1) {
-          _inputBuffer = _inputBuffer.substring(0, _inputBuffer.length - 1);
-          if (_inputBuffer.isEmpty || _inputBuffer == '0') {
-            _inputBuffer = '0.0';
         }
       } else {
-          _inputBuffer = '0.0';
+        _pendingValue = null;
       }
-      }
-      _amount = double.parse(_inputBuffer);
     });
   }
 
   /// 处理运算符
   void _handleOperator(String operator) {
     // 如果有待处理的运算，先计算结果
-    if (_pendingOperation != null && !_isNewInput) {
+    if (_pendingOperation != null) {
       // 先保存当前运算符，因为计算可能会重置状态
       final newOperator = operator;
       _calculateResult();
 
-      // 如果计算导致重置（结果为0），不添加新的运算符
-      if (_inputBuffer == '0.0') {
-        return;
-      }
 
       // 计算完成后，设置新的运算符
       setState(() {
-        _pendingOperation = newOperator;
-        _pendingValue = double.parse(_inputBuffer);
-        _isNewInput = true;
-      });
+        // 如果计算导致重置（结果为0），不添加新的运算符
+        if (_inputBuffer == '0.0') {
+          return;
         } else {
+          _pendingOperation = newOperator;
+        }
+      });
+    } else if(_inputValue != null)  {
       // 正常设置运算符
       setState(() {
         _pendingOperation = operator;
-        _pendingValue = double.parse(_inputBuffer);
-        _isNewInput = true;
+        _pendingValue = _inputValue!;
+        _inputValue = null; 
       });
+    } else {
+      HapticFeedback.heavyImpact();
     }
   }
 
   /// 计算结果
   void _calculateResult() {
-    if (_pendingOperation != null && _pendingValue != null && !_isNewInput) {
-      final currentValue = double.parse(_inputBuffer);
+    if (_pendingOperation != null &&
+        _pendingValue != null &&
+        _inputValue != null) {
+      final currentValue = double.parse(_inputValue!);
       double result;
 
       switch (_pendingOperation) {
         case '+':
-          result = _pendingValue! + currentValue;
+          result = double.parse(_pendingValue!) + currentValue;
           if (result == 0) {
             _resetToDefault();
             return;
           }
           break;
         case '-':
-          result = _pendingValue! - currentValue;
+          result = double.parse(_pendingValue!) - currentValue;
           if (result <= 0) {
             _resetToDefault();
             return;
@@ -242,11 +222,10 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
 
       setState(() {
         // 格式化结果，去掉不必要的小数位
-        _inputBuffer = _formatNumberForDisplay(result);
+        _pendingValue = _formatNumberForDisplay(result);
         _amount = result;
         _pendingOperation = null;
-        _pendingValue = null;
-        _isNewInput = true;
+        _inputValue = null;
       });
     }
   }
@@ -258,7 +237,7 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
       _amount = 0;
       _pendingOperation = null;
       _pendingValue = null;
-      _isNewInput = true;
+      _inputValue = null;
     });
   }
 
@@ -373,7 +352,9 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
       onTap: () => setState(() => _selectedCategoryId = category.id),
       child: Container(
         decoration: BoxDecoration(
-          color: isSelected ? Theme.of(context).primaryColor.withOpacity(0.1) : null,
+          color: isSelected
+              ? Theme.of(context).primaryColor.withOpacity(0.1)
+              : null,
           border: Border.all(
             color: isSelected ? Theme.of(context).primaryColor : Colors.grey,
           ),
@@ -390,7 +371,8 @@ class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateM
             Text(
               category.name,
               style: TextStyle(
-                color: isSelected ? Theme.of(context).primaryColor : Colors.grey,
+                color:
+                    isSelected ? Theme.of(context).primaryColor : Colors.grey,
               ),
             ),
           ],

lib/pages/record_page_base.dart

@@ -0,0 +1,533 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import '../models/record.dart';
+import '../data/categories.dart';
+import 'package:uuid/uuid.dart';
+
+class RecordPage extends StatefulWidget {
+  final Record? record;
+  final Function(Record) onSave;  // 添加保存回调
+
+  const RecordPage({
+    Key? key,
+    this.record,
+    required this.onSave,
+  }) : super(key: key);
+
+  @override
+  State<RecordPage> createState() => _RecordPageState();
+}
+
+class _RecordPageState extends State<RecordPage> with SingleTickerProviderStateMixin {
+  late TabController _tabController;
+  String? _selectedCategoryId;
+  String _note = '';
+  double _amount = 0.0;
+  DateTime _selectedDate = DateTime.now();
+  final _uuid = const Uuid();
+  String _inputBuffer = '0.0';  // 用于显示的字符串
+  String? _pendingOperation;    // 等待执行的运算符
+  double? _pendingValue;        // 等待计算的第一个值
+  bool _isNewInput = true;      // 是否开始新的输入
+  
+  @override
+  void initState() {
+    super.initState();
+    // 先初始化 TabController
+    _tabController = TabController(
+      length: 2,
+      vsync: this,
+      initialIndex: widget.record?.type == RecordType.income ? 1 : 0,
+    );
+    _tabController.addListener(_onTabChanged);
+
+    // 初始化数据
+    if (widget.record != null) {
+      // 编辑模式：初始化现有记录的数据
+      _selectedCategoryId = widget.record!.categoryId;
+      _note = widget.record!.note ?? '';
+      _amount = widget.record!.amount;
+      _selectedDate = widget.record!.createTime;
+      // 设置输入缓冲区为当前金额的格式化字符串
+      _inputBuffer = _formatNumberForDisplay(widget.record!.amount);
+      _isNewInput = false;
+    } else {
+      // 新建模式：默认选中第一个分类
+      _selectedCategoryId = _currentCategories.first.id;
+    }
+  }
+
+  /// 标签切换监听
+  void _onTabChanged() {
+    setState(() {
+      // 切换类型时选中新类型的第一个分类
+      _selectedCategoryId = _currentCategories.first.id;
+    });
+  }
+
+  /// 获取当前记录类型
+  RecordType get _currentType => 
+      _tabController.index == 0 ? RecordType.expense : RecordType.income;
+
+  /// 获取当前分类列表
+  List<Category> get _currentCategories => 
+      _currentType == RecordType.expense ? expenseCategories : incomeCategories;
+
+  /// 保存记录
+  void _saveRecord() {
+    if (_selectedCategoryId == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('请选择分类')),
+      );
+      return;
+    }
+    if (_amount <= 0) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('请输入金额')),
+      );
+      return;
+    }
+
+    final record = Record(
+      id: widget.record?.id ?? _uuid.v4(),
+      type: _currentType,
+      categoryId: _selectedCategoryId!,
+      note: _note.isEmpty ? null : _note,
+      amount: _amount,
+      createTime: _selectedDate,
+    );
+
+    widget.onSave(record);
+    Navigator.of(context).pop();
+  }
+
+  /// 格式化显示金额
+  String get _displayAmount {
+    if (_pendingOperation != null && _pendingValue != null) {
+      return '$_pendingValue $_pendingOperation ${_isNewInput ? "" : _inputBuffer}';
+    }
+    return _inputBuffer;
+  }
+
+  /// 处理数字输入
+  void _handleNumber(String digit) {
+    setState(() {
+      if (_isNewInput) {
+        // 新输入时直接替换
+        _inputBuffer = digit;
+        _isNewInput = false;
+      } else if (_inputBuffer == '0' && !_inputBuffer.contains('.')) {
+        // 当前是0且没有小数点时，直接替换0
+        _inputBuffer = digit;
+      } else if (_inputBuffer == '0.0') {
+        // 如果是默认状态，直接替换为新数字
+        _inputBuffer = digit;
+        _isNewInput = false;
+      } else {
+        // 其他情况追加数字
+        _inputBuffer = _inputBuffer + digit;
+      }
+      _amount = double.parse(_inputBuffer);
+    });
+  }
+
+  /// 处理小数点
+  void _handleDecimal() {
+    setState(() {
+      if (!_inputBuffer.contains('.')) {
+        // 如果是默认状态(0.0)或只有0，直接显示0.
+        if (_inputBuffer == '0.0' || _inputBuffer == '0') {
+          _inputBuffer = '0.';
+          _isNewInput = false;
+        } else {
+          // 其他数字直接加小数点
+          _inputBuffer = '$_inputBuffer.';
+        }
+      } else {
+        // 已有小数点时震动反馈
+        HapticFeedback.heavyImpact();
+      }
+    });
+  }
+
+  /// 处理删除
+  void _handleDelete() {
+    setState(() {
+      if (_pendingOperation != null && !_isNewInput) {
+        // 删除第二个数字
+        if (_inputBuffer.length > 1) {
+          _inputBuffer = _inputBuffer.substring(0, _inputBuffer.length - 1);
+          if (_inputBuffer.isEmpty || _inputBuffer == '0') {
+            _inputBuffer = '0.0';
+            _isNewInput = true;
+          }
+        } else {
+          _inputBuffer = '0.0';
+          _isNewInput = true;
+        }
+      } else if (_pendingOperation != null) {
+        // 删除运算符
+        _inputBuffer = _pendingValue.toString();
+        _pendingOperation = null;
+        _pendingValue = null;
+        _isNewInput = false;
+      } else {
+        // 删除普通数字
+        if (_inputBuffer.length > 1) {
+          _inputBuffer = _inputBuffer.substring(0, _inputBuffer.length - 1);
+          if (_inputBuffer.isEmpty || _inputBuffer == '0') {
+            _inputBuffer = '0.0';
+          }
+        } else {
+          _inputBuffer = '0.0';
+        }
+      }
+      _amount = double.parse(_inputBuffer);
+    });
+  }
+
+  /// 处理运算符
+  void _handleOperator(String operator) {
+    // 如果有待处理的运算，先计算结果
+    if (_pendingOperation != null && !_isNewInput) {
+      // 先保存当前运算符，因为计算可能会重置状态
+      final newOperator = operator;
+      _calculateResult();
+      
+      // 如果计算导致重置（结果为0），不添加新的运算符
+      if (_inputBuffer == '0.0') {
+        return;
+      }
+      
+      // 计算完成后，设置新的运算符
+      setState(() {
+        _pendingOperation = newOperator;
+        _pendingValue = double.parse(_inputBuffer);
+        _isNewInput = true;
+      });
+    } else {
+      // 正常设置运算符
+      setState(() {
+        _pendingOperation = operator;
+        _pendingValue = double.parse(_inputBuffer);
+        _isNewInput = true;
+      });
+    }
+  }
+
+  /// 计算结果
+  void _calculateResult() {
+    if (_pendingOperation != null && _pendingValue != null && !_isNewInput) {
+      final currentValue = double.parse(_inputBuffer);
+      double result;
+      
+      switch (_pendingOperation) {
+        case '+':
+          result = _pendingValue! + currentValue;
+          if (result == 0) {
+            _resetToDefault();
+            return;
+          }
+          break;
+        case '-':
+          result = _pendingValue! - currentValue;
+          if (result <= 0) {
+            _resetToDefault();
+            return;
+          }
+          break;
+        default:
+          return;
+      }
+      
+      setState(() {
+        // 格式化结果，去掉不必要的小数位
+        _inputBuffer = _formatNumberForDisplay(result);
+        _amount = result;
+        _pendingOperation = null;
+        _pendingValue = null;
+        _isNewInput = true;
+      });
+    }
+  }
+
+  /// 重置到默认状态
+  void _resetToDefault() {
+    setState(() {
+      _inputBuffer = '0.0';
+      _amount = 0;
+      _pendingOperation = null;
+      _pendingValue = null;
+      _isNewInput = true;
+    });
+  }
+
+  /// 格式化数字用于显示
+  String _formatNumberForDisplay(double number) {
+    // 如果是整数，直接返回整数部分
+    if (number % 1 == 0) {
+      return number.toInt().toString();
+    }
+    // 如果是小数，去掉末尾的0
+    String numStr = number.toString();
+    while (numStr.endsWith('0')) {
+      numStr = numStr.substring(0, numStr.length - 1);
+    }
+    if (numStr.endsWith('.')) {
+      numStr = numStr.substring(0, numStr.length - 1);
+    }
+    return numStr;
+  }
+
+  /// 修改键盘按钮处理逻辑
+  void _onKeyboardButtonPressed(String value) {
+    switch (value) {
+      case '删除':
+        _handleDelete();
+        break;
+      case '保存':
+        _calculateResult();
+        _saveRecord();
+        break;
+      case 'again':
+        // TODO: 实现again功能
+        break;
+      case '+':
+      case '-':
+        _handleOperator(value);
+        break;
+      case '.':
+        _handleDecimal();
+        break;
+      default:
+        _handleNumber(value);
+    }
+  }
+
+  /// 格式化日期显示
+  String _formatDate(DateTime date) {
+    final now = DateTime.now();
+    final today = DateTime(now.year, now.month, now.day);
+    final dateToCheck = DateTime(date.year, date.month, date.day);
+    final difference = today.difference(dateToCheck).inDays;
+
+    // 检查是否是今天、昨天、前天
+    switch (difference) {
+      case 0:
+        return '今天';
+      case 1:
+        return '昨天';
+      case 2:
+        return '前天';
+      default:
+        // 如果是当年
+        if (date.year == now.year) {
+          return '${date.month}/${date.day}';
+        }
+        // 不是当年
+        return '${date.year}/${date.month}/${date.day}';
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: TabBar(
+          controller: _tabController,
+          tabs: const [
+            Tab(text: '支出'),
+            Tab(text: '收入'),
+          ],
+        ),
+      ),
+      body: Column(
+        children: [
+          // 分类网格
+          Expanded(
+            child: GridView.builder(
+              padding: const EdgeInsets.all(16),
+              gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+                crossAxisCount: 4,
+                mainAxisSpacing: 16,
+                crossAxisSpacing: 16,
+              ),
+              itemCount: _currentCategories.length,
+              itemBuilder: (context, index) {
+                final category = _currentCategories[index];
+                final isSelected = category.id == _selectedCategoryId;
+                return _buildCategoryItem(category, isSelected);
+              },
+            ),
+          ),
+          // 底部编辑区域
+          _buildBottomEditor(),
+        ],
+      ),
+    );
+  }
+
+  /// 构建分类项
+  Widget _buildCategoryItem(Category category, bool isSelected) {
+    return InkWell(
+      onTap: () => setState(() => _selectedCategoryId = category.id),
+      child: Container(
+        decoration: BoxDecoration(
+          color: isSelected ? Theme.of(context).primaryColor.withOpacity(0.1) : null,
+          border: Border.all(
+            color: isSelected ? Theme.of(context).primaryColor : Colors.grey,
+          ),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(
+              category.icon,
+              color: isSelected ? Theme.of(context).primaryColor : Colors.grey,
+            ),
+            const SizedBox(height: 4),
+            Text(
+              category.name,
+              style: TextStyle(
+                color: isSelected ? Theme.of(context).primaryColor : Colors.grey,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  /// 构建底部编辑区域
+  Widget _buildBottomEditor() {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: Colors.white,
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black.withOpacity(0.1),
+            blurRadius: 8,
+            offset: const Offset(0, -2),
+          ),
+        ],
+      ),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          // 备注和金额
+          _buildNoteAndAmount(),
+          // 配置按钮
+          Row(
+            children: [
+              TextButton.icon(
+                onPressed: () {
+                  // TODO: 实现账户选择
+                },
+                icon: const Icon(Icons.account_balance_wallet),
+                label: const Text('默认账户'),
+              ),
+              TextButton.icon(
+                onPressed: () async {
+                  final date = await showDatePicker(
+                    context: context,
+                    initialDate: _selectedDate,
+                    firstDate: DateTime(2000),
+                    lastDate: DateTime.now(),
+                  );
+                  if (date != null) {
+                    setState(() => _selectedDate = date);
+                  }
+                },
+                icon: const Icon(Icons.calendar_today),
+                label: Text(_formatDate(_selectedDate)),
+              ),
+              TextButton.icon(
+                onPressed: () {
+                  // TODO: 实现图片选择
+                },
+                icon: const Icon(Icons.photo),
+                label: const Text('图片'),
+              ),
+            ],
+          ),
+          // 数字键盘
+          _buildNumberKeyboard(),
+        ],
+      ),
+    );
+  }
+
+  /// 构建数字键盘
+  Widget _buildNumberKeyboard() {
+    return GridView.count(
+      shrinkWrap: true,
+      crossAxisCount: 4,
+      childAspectRatio: 2,
+      children: [
+        _buildKeyboardButton('7'),
+        _buildKeyboardButton('8'),
+        _buildKeyboardButton('9'),
+        _buildKeyboardButton('删除', isFunction: true),
+        _buildKeyboardButton('4'),
+        _buildKeyboardButton('5'),
+        _buildKeyboardButton('6'),
+        _buildKeyboardButton('+'),
+        _buildKeyboardButton('1'),
+        _buildKeyboardButton('2'),
+        _buildKeyboardButton('3'),
+        _buildKeyboardButton('-'),
+        _buildKeyboardButton('again'),
+        _buildKeyboardButton('0'),
+        _buildKeyboardButton('.'),
+        _buildKeyboardButton('保存', isFunction: true),
+      ],
+    );
+  }
+
+  /// 构建键盘按钮
+  Widget _buildKeyboardButton(String text, {bool isFunction = false}) {
+    return TextButton(
+      onPressed: () => _onKeyboardButtonPressed(text),
+      child: Text(
+        text,
+        style: TextStyle(
+          fontSize: 20,
+          color: isFunction ? Theme.of(context).primaryColor : Colors.black,
+        ),
+      ),
+    );
+  }
+
+  /// 构建底部编辑区域中的备注和金额行
+  Widget _buildNoteAndAmount() {
+    return Row(
+      children: [
+        Expanded(
+          child: TextField(
+            controller: TextEditingController(text: _note), // 使用控制器设置初始值
+            decoration: const InputDecoration(
+              hintText: '添加备注',
+              border: InputBorder.none,
+            ),
+            onChanged: (value) => setState(() => _note = value),
+          ),
+        ),
+        Text(
+          _displayAmount,
+          style: const TextStyle(
+            fontSize: 24,
+            fontWeight: FontWeight.bold,
+          ),
+        ),
+      ],
+    );
+  }
+
+  @override
+  void dispose() {
+    _tabController.dispose();
+    super.dispose();
+  }
+} 

pubspec.lock

@@ -6,7 +6,7 @@ packages:
     description:
       name: async
       sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.11.0"
   boolean_selector:
@@ -14,7 +14,7 @@ packages:
     description:
       name: boolean_selector
       sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
   characters:
@@ -22,7 +22,7 @@ packages:
     description:
       name: characters
       sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.0"
   clock:
@@ -30,7 +30,7 @@ packages:
     description:
       name: clock
       sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
   collection:
@@ -38,7 +38,7 @@ packages:
     description:
       name: collection
       sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.18.0"
   crypto:
@@ -46,7 +46,7 @@ packages:
     description:
       name: crypto
       sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "3.0.3"
   cupertino_icons:
@@ -54,7 +54,7 @@ packages:
     description:
       name: cupertino_icons
       sha256: ba631d1c7f7bef6b729a622b7b752645a2d076dba9976925b8f25725a30e1ee6
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.0.8"
   device_info_plus:
@@ -62,23 +62,23 @@ packages:
     description:
       name: device_info_plus
       sha256: "093b02a284b4969bb641a6236bbb8e626e4035c6ec9e30c20b65d505c24b3080"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "10.0.0"
   device_info_plus_platform_interface:
     dependency: transitive
     description:
       name: device_info_plus_platform_interface
-      sha256: "282d3cf731045a2feb66abfe61bbc40870ae50a3ed10a4d3d217556c35c8c2ba"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      sha256: "0b04e02b30791224b31969eb1b50d723498f402971bff3630bca2ba839bd1ed2"
+      url: "https://pub.dev"
     source: hosted
-    version: "7.0.1"
+    version: "7.0.2"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.1"
   ffi:
@@ -86,7 +86,7 @@ packages:
     description:
       name: ffi
       sha256: "7bf0adc28a23d395f19f3f1eb21dd7cfd1dd9f8e1c50051c069122e6853bc878"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.0"
   file:
@@ -94,7 +94,7 @@ packages:
     description:
       name: file
       sha256: a3b4f84adafef897088c160faf7dfffb7696046cb13ae90b508c2cbc95d3b8d4
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "7.0.1"
   fixnum:
@@ -102,7 +102,7 @@ packages:
     description:
       name: fixnum
       sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.1"
   flutter:
@@ -115,7 +115,7 @@ packages:
     description:
       name: flutter_lints
       sha256: a25a15ebbdfc33ab1cd26c63a6ee519df92338a9c10f122adda92938253bef04
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.0.3"
   flutter_test:
@@ -133,7 +133,7 @@ packages:
     description:
       name: lints
       sha256: "0a217c6c989d21039f1498c3ed9f3ed71b354e69873f13a8dfc3c9fe76f1b452"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
   logging:
@@ -141,7 +141,7 @@ packages:
     description:
       name: logging
       sha256: "623a88c9594aa774443aa3eb2d41807a48486b5613e67599fb4c41c0ad47c340"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.0"
   matcher:
@@ -149,7 +149,7 @@ packages:
     description:
       name: matcher
       sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "0.12.16"
   material_color_utilities:
@@ -157,7 +157,7 @@ packages:
     description:
       name: material_color_utilities
       sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "0.5.0"
   meta:
@@ -165,7 +165,7 @@ packages:
     description:
       name: meta
       sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.10.0"
   path:
@@ -173,7 +173,7 @@ packages:
     description:
       name: path
       sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.8.3"
   plugin_platform_interface:
@@ -181,7 +181,7 @@ packages:
     description:
       name: plugin_platform_interface
       sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.8"
   sensors_plus:
@@ -189,7 +189,7 @@ packages:
     description:
       name: sensors_plus
       sha256: "362c8f4f001838b90dd5206b898bbad941bc0142479eab9a3415f0f79e622908"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.4.1"
   sensors_plus_platform_interface:
@@ -197,7 +197,7 @@ packages:
     description:
       name: sensors_plus_platform_interface
       sha256: bc472d6cfd622acb4f020e726433ee31788b038056691ba433fec80e448a094f
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.0"
   sensors_plus_web:
@@ -205,7 +205,7 @@ packages:
     description:
       name: sensors_plus_web
       sha256: fca8d7d9ab6233b2a059952666415508e252420be1ef54f092d07884da53ec5e
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.2"
   sky_engine:
@@ -218,7 +218,7 @@ packages:
     description:
       name: source_span
       sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.10.0"
   sprintf:
@@ -226,7 +226,7 @@ packages:
     description:
       name: sprintf
       sha256: "1fc9ffe69d4df602376b52949af107d8f5703b77cda567c4d7d86a0693120f23"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "7.0.0"
   sqflite:
@@ -234,7 +234,7 @@ packages:
     description:
       name: sqflite
       sha256: a9016f495c927cb90557c909ff26a6d92d9bd54fc42ba92e19d4e79d61e798c6
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.3.2"
   sqflite_common:
@@ -242,7 +242,7 @@ packages:
     description:
       name: sqflite_common
       sha256: "28d8c66baee4968519fb8bd6cdbedad982d6e53359091f0b74544a9f32ec72d5"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.5.3"
   stack_trace:
@@ -250,7 +250,7 @@ packages:
     description:
       name: stack_trace
       sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.11.1"
   stream_channel:
@@ -258,7 +258,7 @@ packages:
     description:
       name: stream_channel
       sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
   string_scanner:
@@ -266,7 +266,7 @@ packages:
     description:
       name: string_scanner
       sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.0"
   synchronized:
@@ -274,7 +274,7 @@ packages:
     description:
       name: synchronized
       sha256: "539ef412b170d65ecdafd780f924e5be3f60032a1128df156adad6c5b373d558"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "3.1.0+1"
   term_glyph:
@@ -282,7 +282,7 @@ packages:
     description:
       name: term_glyph
       sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.2.1"
   test_api:
@@ -290,7 +290,7 @@ packages:
     description:
       name: test_api
       sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "0.6.1"
   typed_data:
@@ -298,7 +298,7 @@ packages:
     description:
       name: typed_data
       sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.3.2"
   uuid:
@@ -306,7 +306,7 @@ packages:
     description:
       name: uuid
       sha256: a5be9ef6618a7ac1e964353ef476418026db906c4facdedaa299b7a2e71690ff
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "4.5.1"
   vector_math:
@@ -314,7 +314,7 @@ packages:
     description:
       name: vector_math
       sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "2.1.4"
   vibration:
@@ -322,7 +322,7 @@ packages:
     description:
       name: vibration
       sha256: "06588a845a4ebc73ab7ff7da555c2b3dbcd9676164b5856a38bf0b2287f1045d"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
   vibration_platform_interface:
@@ -330,7 +330,7 @@ packages:
     description:
       name: vibration_platform_interface
       sha256: f66b39aab2447038978c16f3d6f77228e49ef5717556e3da02313e044e4a7600
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "0.0.2"
   web:
@@ -338,7 +338,7 @@ packages:
     description:
       name: web
       sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "0.3.0"
   win32:
@@ -346,7 +346,7 @@ packages:
     description:
       name: win32
       sha256: "464f5674532865248444b4c3daca12bd9bf2d7c47f759ce2617986e7229494a8"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "5.2.0"
   win32_registry:
@@ -354,7 +354,7 @@ packages:
     description:
       name: win32_registry
       sha256: "41fd8a189940d8696b1b810efb9abcf60827b6cbfab90b0c43e8439e3a39d85a"
-      url: "https://mirrors.tuna.tsinghua.edu.cn/dart-pub/"
+      url: "https://pub.dev"
     source: hosted
     version: "1.1.2"
 sdks: