用IDEA flutter 完成

要使用 IntelliJ IDEA（或 Android Studio）的 Flutter 插件完成实验室安全测试平台的应用程序开发，你可以参考以下步骤： ### 1. 准备工作 #### 添加依赖 在 `pubspec.yaml` 文件中添加必要的依赖，例如 `sqflite` 用于数据库操作。 ```yaml dependencies: flutter: sdk: flutter sqflite: ^1.3.0 ``` 保存文件后，点击编辑窗口右上角的 "Packages get" 按钮安装依赖。 ### 2. 数据库设计 #### 创建数据库文件 根据需求，创建包含 8 个表的 `school.db` 数据库文件，每个表对应一种题库类。表结构如下： ```sql CREATE TABLE tsl ( tino INTEGER PRIMARY KEY, ticontent TEXT, tia TEXT, tib TEXT, tic TEXT, tid TEXT, tianswer TEXT, titype INTEGER ); -- 其他表类似，例如 hxl, yxswl, jxjzl, dql, fsl, tzsbl, xfl ``` #### 将数据库文件放入资源目录 将 `school.db` 放入项目的 `assets/db` 目录，并在 `pubspec.yaml` 文件中声明资源文件。 ```yaml flutter: assets: - assets/db/school.db ``` ### 3. 初始化数据库 #### 定义初始化数据库方法 在应用启动时检查数据库文件是否存在，如果不存在则从资源文件中复制。 ```dart import 'package:path_provider/path_provider.dart'; import 'package:sqflite/sqflite.dart'; import 'dart:io'; import 'package:path/path.dart'; Future<Database> initDB() async { String path = join(await getDatabasesPath(), 'school.db'); bool exists = await databaseExists(path); if (!exists) { try { await Directory(dirname(path)).create(recursive: true); } catch (_) {} ByteData data = await rootBundle.load(join('assets', 'db', 'school.db')); List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes); await File(path).writeAsBytes(bytes, flush: true); } return await openDatabase(path); } ``` ### 4. 题库选择页面 #### 定义题库类别按钮组 创建题库选择页面，包含题库类别的按钮组。 ```dart import 'package:flutter/material.dart'; class MainPage extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: MainPageState(), ); } } class MainPageState extends StatefulWidget { @override _MainPageState createState() => _MainPageState(); } class _MainPageState extends State<MainPageState> { List<String> types = [ '通识类\n安全题', '化学类\n安全题', '医学生物类\n安全题', '机械建筑类\n安全题', '电气类\n安全题', '辐射类\n安全题', '特种设备\n安全题', '消防\n安全题', '退出系统' ]; List<Widget> selects = []; @override void initState() { super.initState(); initFlatButton(types, context); } void initFlatButton(List<String> types, BuildContext context) { for (int i = 0; i < types.length; i++) { FlatButton flatButton = FlatButton( color: Colors.blue, child: Text( types[i], style: TextStyle(fontSize: 18), textAlign: TextAlign.center, ), onPressed: () { if (i < types.length - 1) { Navigator.push( context, MaterialPageRoute( builder: (context) => Exam(examId: i, db: initDB()), ), ); } else { exit(0); } }, ); selects.add(flatButton); } } @override Widget build(BuildContext context) { GridView gridView = GridView.count( crossAxisCount: 3, mainAxisSpacing: 3, crossAxisSpacing: 3, children: selects, ); return Scaffold( appBar: AppBar(title: Text('实验室安全测试平台')), body: Padding( padding: EdgeInsets.all(10), child: gridView, ), ); } } ``` ### 5. 测试页面 #### 获取测试题库表 根据用户选择的题库类型，从数据库中读取相应的题目。 ```dart import 'package:flutter/material.dart'; import 'package:sqflite/sqflite.dart'; class Exam extends StatefulWidget { final int examId; final Future<Database> db; Exam({@required this.examId, @required this.db}); @override _ExamState createState() => _ExamState(); } class _ExamState extends State<Exam> { int examNo; Database studyDB; List<Map<String, dynamic>> maps = []; List<Map<String, dynamic>> smaps = []; String examType = 'tsl'; int jindex = 0; var jselected = ''; String jticontent = ''; String jtino = ''; String jtia = ''; String jtib = ''; String jtianswer = ''; @override void initState() { super.initState(); widget.db.then((value) { studyDB = value; examNo = widget.examId; examType = getExamType(examNo); getJudgeDetail(examType, '1'); getSingleDetail(examType, '2'); }); } String getExamType(int examNo) { switch (examNo) { case 0: return 'tsl'; case 1: return 'hxl'; case 2: return 'yxswl'; case 3: return 'jxjzl'; case 4: return 'dql'; case 5: return 'fsl'; case 6: return 'tzsbl'; case 7: return 'xfl'; default: return 'tsl'; } } void getJudgeDetail(String examType, String tiType) async { List<dynamic> values = [tiType]; String sql = 'SELECT * FROM $examType WHERE titype = ?'; List<Map<String, dynamic>> maps = await studyDB.rawQuery(sql, values); setState(() { this.maps = maps; if (maps.isNotEmpty) { jtino = maps[0]['tino'].toString(); jticontent = maps[0]['ticontent']; jtia = maps[0]['tia']; jtib = maps[0]['tib']; jtianswer = maps[0]['tianswer']; } }); } void getSingleDetail(String examType, String tiType) async { List<dynamic> values = [tiType]; String sql = 'SELECT * FROM $examType WHERE titype = ?'; List<Map<String, dynamic>> smaps = await studyDB.rawQuery(sql, values); setState(() { this.smaps = smaps; }); } @override Widget build(BuildContext context) { // 生成测试页面 Widget jdetail = Padding( padding: EdgeInsets.all(8), child: Column( mainAxisAlignment: MainAxisAlignment.spaceAround, crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ Text('$jtino, $jticontent'), RadioListTile( value: 'a', groupValue: jselected, title: Text('A'), subtitle: Text(jtia), onChanged: (value) { setState(() { jselected = value; }); }, ), // 其他选项代码类似 Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ Text( '你选的答案为：$jselected', style: TextStyle(color: jselected == jtianswer ? Colors.black : Colors.red), ), FlatButton( child: Text('查看解析'), onPressed: () { showModalBottomSheet( context: context, builder: (context) { return Container( alignment: Alignment.center, height: 100, child: Text('标准答案为：$jtianswer'), ); }, ); }, ), ], ), Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ RaisedButton( child: Text('上一题'), onPressed: () { if (jindex > 0) { jindex--; setState(() { jselected = ''; jtino = maps[jindex]['tino'].toString(); jticontent = maps[jindex]['ticontent']; jtia = maps[jindex]['tia']; jtib = maps[jindex]['tib']; jtianswer = maps[jindex]['tianswer']; }); } }, ), RaisedButton( child: Text('下一题'), onPressed: () { if (jindex < maps.length - 1) { jindex++; setState(() { jselected = ''; jtino = maps[jindex]['tino'].toString(); jticontent = maps[jindex]['ticontent']; jtia = maps[jindex]['tia']; jtib = maps[jindex]['tib']; jtianswer = maps[jindex]['tianswer']; }); } }, ), ], ), ], ), ); // 选择题测试页面 (sdetail) 代码类似 TabBar tabBar = TabBar( tabs: <Widget>[ Tab(icon: Icon(Icons.offline_pin), text: '判断题'), Tab(icon: Icon(Icons.panorama_fish_eye), text: '选择题'), ], labelColor: Colors.yellow, ); TabBarView tabBarView = TabBarView( children: <Widget>[ jdetail, // sdetail, ], ); DefaultTabController tabController = DefaultTabController( length: 2, child: Scaffold( appBar: AppBar( title: Text(getExamType(examNo)), bottom: tabBar, ), body: tabBarView, ), ); return tabController; } } ``` ### 6. 运行应用 在 IntelliJ IDEA 或 Android Studio 中运行应用，确保所有配置正确无误。 通过以上步骤，你可以完成实验室安全测试平台的应用程序开发。希望这对你有所帮助！