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待辦任務APP

Chen Chen
海大 SwiftUI iOS / Flutter App 程式設計
Published in
20 min readJun 12, 2024

【GitHub|因為一堆API key還沒處理先暫不打開】

【待辦任務app|目前是部署好了但還沒解決Proxy Server問題】

(18周還要考試所以之後才會改完Orz)

#開發註冊功能FavQs API問題

網頁開發常見之 CORS 錯誤原因與 Express 解決辦法

解法: 在local端創建代理伺服器，繞過CORS限制

  • 初始化一個新的Node.js項目：
npm init -y
  • 安装Express和CORS
npm install express cors axios
  • 新增 server.js
const express = require('express');
const cors = require('cors');
const axios = require('axios');
const app = express();

app.use(cors());
app.use(express.json());

app.post('/api/users', async (req, res) => {
  try {
    const response = await axios.post('https://favqs.com/api/users', req.body, {
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Token token="YOUR_FAVQS_API_KEY"',
      },
    });
    res.json(response.data);
  } catch (error) {
    res.status(error.response.status).json(error.response.data);
  }
});

app.post('/api/session', async (req, res) => {
  try {
    const response = await axios.post('https://favqs.com/api/session', req.body, {
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Token token="YOUR_FAVQS_API_KEY"',
      },
    });
    res.json(response.data);
  } catch (error) {
    res.status(error.response.status).json(error.response.data);
  }
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});
  • 啟動代理服務
node server.js

#Flutter Riverpod

一些參考: Flutter Riverpod 輕鬆學，簡單處理狀態管理！

//tasks_screen.dart
//todoListProvider 提供 TodoList 狀態管理器，供 Flutter Riverpod 使用。
import 'package:flutter_riverpod/flutter_riverpod.dart';
class TasksScreen extends ConsumerWidget {
  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final tasks = ref.watch(todoListProvider);
  1. TodoList 類別：
  • 繼承自 StateNotifier<List<Todo>>，管理 Todo 類型的列表。
  • 構造函數中調用了 _loadTodos 和 _loadTodosFromFirestore 方法來載入本地和雲端的待辦事項。
  • 使用 uuid 生成唯一的待辦事項 ID。

2. 新增、拖曳、編輯、移除

  • add 方法用來新增待辦事項，創建新 Todo 對象，並將其添加到狀態列表中，同時保存到本地和 Firestore 中。
  • toggleCompletion 方法根據 ID 切換待辦事項的完成狀態，並更新 Firestore 中的對應記錄。
  • edit 方法用來編輯指定 ID 的待辦事項，並更新 Firestore 中的對應記錄。
  • remove 方法根據 ID 刪除待辦事項，並從 Firestore 中刪除對應記錄。

3. 更新優先級：

  • updatePriority 方法用來更新指定 ID 的待辦事項的優先級，並更新 Firestore 中的對應記錄。

4. 從 Firestore 載入待辦事項：

  • _loadTodosFromFirestore
  • _addTodoToFirestore
  • _updateTodoInFirestore
  • _deleteTodoFromFirestore
  • _updateTodoPriorityInFirestore

5. 本地儲存操作：

  • _loadTodos 方法從本地 SharedPreferences 載入待辦事項。
  • _saveTodos 方法將待辦事項保存到本地 SharedPreferences。

#雲端同步初始化 Firebase：

//在 main.dart 中初始化 Firebase。
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  try {
    await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
    print('Firebase initialized successfully');
  } catch (e) {
    print('Error initializing Firebase: $e');
  }
  runApp(ProviderScope(child: MyApp()));
}

1. 雲端儲存和同步：

在 home_screen.dart 中使用 Firestore 來儲存和同步任務。
使用 StreamBuilder 來實時監聽 Firestore 中的數據變化，並更新 UI。
登出：

提供登出功能，清除使用者的登入狀態，並導航回登入頁面。

dart pub global activate flutterfire_cli

flutterfire/CHANGELOG.md at master · firebase/flutterfire

🔥 A collection of Firebase plugins for Flutter apps. - flutterfire/CHANGELOG.md at master · firebase/flutterfire

github.com

# 部署到Firebase

先記錄一些問題~ flutter版本、git資料夾

firebase init
Hosting: Configure files for Firebase Hosting and (optionally) set up GitHub Action deploys
What do you want to use as your public directory? build/web
  1. 點一點然後Push
  2. GitHub Actions看是否有成功
  3. 去Firebase Console看網址

拖曳待辦事項

創建任務

  • 使用 showModalBottomSheet 函數，彈出一個從底部滑入的對話框，並覆蓋在當前的視圖之上。滑入效果是透過 showModalBottomSheet 提供的內置動畫來實現的。

完成任務

雲端同步

每日一詞

  • 抓不到資料，比方網路有問題時，畫面上顯示錯誤資訊。
  • 使用LinearProgressIndicator，在抓資料時顯示資料下載中(如下圖)
final poetryDataProvider = FutureProvider<PoetryData>((ref) async {
  final response =
      await http.get(Uri.parse('https://v2.jinrishici.com/one.json'));

  if (response.statusCode == 200) {
    var data = json.decode(response.body);
    return PoetryData.fromJson(data['data']);
  } else {
    throw Exception('Failed to load poetry');
  }
});
  • 將 JSON 轉換成自訂型別。轉換詩詞資料

class PoetryData {
  final String id;
  final String content;
  final int popularity;
  final Origin origin;

  PoetryData({
    required this.id,
    required this.content,
    required this.popularity,
    required this.origin,
  });

  factory PoetryData.fromJson(Map<String, dynamic> json) {
    return PoetryData(
      id: json['id'],
      content: json['content'],
      popularity: json['popularity'],
      origin: Origin.fromJson(json['origin']),
    );
  }
}

class Origin {
  final String title;
  final String dynasty;
  final String author;
  final List<String> content;
  final String? translate;

  Origin({
    required this.title,
    required this.dynasty,
    required this.author,
    required this.content,
    this.translate,
  });

  factory Origin.fromJson(Map<String, dynamic> json) {
    return Origin(
      title: json['title'],
      dynasty: json['dynasty'],
      author: json['author'],
      content: List<String>.from(json['content']),
      translate: json['translate'],
    );
  }
}
  • 點選項目可到下一頁顯示 detail

class PoetryDetailScreen extends StatelessWidget {
  final PoetryData poetryData;

  PoetryDetailScreen({required this.poetryData});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(poetryData.origin.title),
      ),
      backgroundColor: Color(0xFFF0F2F3),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Container(
              padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(10),
              ),
              child: Text(
                poetryData.origin.title,
                style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
              ),
            ),
            SizedBox(height: 8),
            Container(
              padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(10),
              ),
              child: Text(
                '作者: ${poetryData.origin.author} (${poetryData.origin.dynasty})',
                style: TextStyle(fontSize: 18, fontStyle: FontStyle.italic),
              ),
            ),
            SizedBox(height: 16),
            Container(
              padding: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(10),
              ),
              child: Text(
                poetryData.content,
                style: TextStyle(fontSize: 16),
              ),
            ),
            SizedBox(height: 16),
            Container(
              padding: EdgeInsets.symmetric(vertical: 8, horizontal: 8),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(10),
              ),
              child: Column(
                children: [
                  Text(
                    '原文',
                    style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
                  ),
                  for (var line in poetryData.origin.content)
                    Text(
                      line,
                      style: TextStyle(fontSize: 16),
                    ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}
  • 下拉更新功能，使用 RefreshIndicator。
    return Scaffold(
      backgroundColor: Color(0xFFF0F2F3),
      body: RefreshIndicator(
        onRefresh: () async {
          ref.refresh(poetryDataProvider);
        },

# Google-Translate-API


Future<String> translateToTraditional(String text) async {
  final apiKey = Secrets.googleApiKey;
  final url =
      'https://translation.googleapis.com/language/translate/v2?key=$apiKey';

  final response = await http.post(
    Uri.parse(url),
    headers: {'Content-Type': 'application/json'},
    body: jsonEncode({
      'q': text,
      'source': 'zh-CN',
      'target': 'zh-TW',
      'format': 'text',
    }),
  );

  if (response.statusCode == 200) {
    var data = json.decode(response.body);
    return data['data']['translations'][0]['translatedText'];
  } else {
    throw Exception('Failed to translate text');
  }
}

登入 註冊

  • 使用 FavQs API 開發註冊登入功能

Future<void> _register() async {
    print('Attempting to register...');
    try {
      var dio = Dio();
      final response = await dio.post(
        'http://localhost:5000/api/users',
        options: Options(
          headers: {
            'Content-Type': 'application/json',
          },
        ),
        data: {
          'user': {
            'login': _username,
            'email': _email,
            'password': _password,
          },
        },
      );

      print('Response status: ${response.statusCode}');
      print('Response headers: ${response.headers}');
      print('Response data: ${response.data}');

      if (response.statusCode == 200) {
        _showSuccessDialog('註冊成功');
      } else {
        setState(() {
          _errorMessage = '註冊失敗: ${response.data}';
        });
      }
    } catch (error) {
      if (error is DioError) {
        setState(() {
          _errorMessage = 'Dio error: ${error.message}';
        });
        print('Dio error: ${error.message}');
        print('Error type: ${error.type}');
        if (error.response != null) {
          print('Error response: ${error.response?.data}');
        }
      } else {
        setState(() {
          _errorMessage = 'An error occurred: $error';
        });
      }
    }
  }
  • 寫在Proxy Server內的檔案
//server.js
const express = require('express');
const cors = require('cors');
const axios = require('axios');
const app = express();

app.use(cors());
app.use(express.json());

app.post('/api/users', async (req, res) => {
    try {
        const response = await axios.post('https://favqs.com/api/users', req.body, {
            headers: {
                'Content-Type': 'application/json',
                'Authorization': 'Token token={YOUR-FavQs-TOKEN}',//使用 FavQs API 開發註冊登入功能
            },
        });
        res.json(response.data);
    } catch (error) {
        res.status(error.response.status).json(error.response.data);
    }
});

app.post('/api/session', async (req, res) => {
    try {
        const response = await axios.post('https://favqs.com/api/session', req.body, {
            headers: {
                'Content-Type': 'application/json',
                'Authorization': 'Token token={YOUR-FavQs-TOKEN}',
            },
        });
        res.json(response.data);
    } catch (error) {
        res.status(error.response.status).json(error.response.data);
    }
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
    console.log(`Server is running on port ${PORT}`);
});
  • 使用 showDialog 或 showSnackBar 顯示登入失敗
void _showSuccessDialog(String message) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: Text('註冊成功'),
          content: Text(message),
          actions: <Widget>[
            TextButton(
              child: Text('OK'),
              onPressed: () {
                Navigator.of(context).pop();
                Navigator.pushReplacementNamed(context, '/login');
              },
            ),
          ],
        );
      },
    );
  }

--

--

Chen Chen
海大 SwiftUI iOS / Flutter App 程式設計

Written by Chen Chen

2 Followers
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