🔧 常見問題排解

// 確認 main.dart 中正確初始化
await Firebase.initializeApp(
  options: DefaultFirebaseOptions.currentPlatform,
);

// 添加啟動錯誤處理
runZonedGuarded(() {
  runApp(MyApp());
}, (error, stack) {
  print('App crashed: $error');
});

// 增加超時設定和重試機制
final dio = Dio(BaseOptions(
  connectTimeout: 10000,
  receiveTimeout: 10000,
  sendTimeout: 10000,
));

// 添加重試攔截器
dio.interceptors.add(RetryInterceptor(
  dio: dio,
  options: const RetryOptions(
    retries: 3,
    retryInterval: Duration(seconds: 1),
  ),
));

// 僅在開發環境中使用，生產環境必須移除
import 'dart:io';

class MyHttpOverrides extends HttpOverrides {
  @override
  HttpClient createHttpClient(SecurityContext? context) {
    return super.createHttpClient(context)
      ..badCertificateCallback = (X509Certificate cert, String host, int port) => true;
  }
}

// 在 main.dart 中（僅開發環境）
if (kDebugMode) {
  HttpOverrides.global = MyHttpOverrides();
}

// 添加連接狀態監聽
ChatClient.getInstance.addConnectionEventHandler(
  "connection_handler",
  ConnectionEventHandler(
    onConnected: () {
      print("Connected to Agora Chat");
    },
    onDisconnected: (errorCode) {
      print("Disconnected: $errorCode");
    },
  ),
);

// 添加訊息狀態監聽
final message = ChatMessage.createTxtSendMessage(
  targetId: conversationId,
  content: content,
);

message.setMessageStatusCallBack(MessageStatusCallBack(
  onSuccess: () {
    print("Message sent successfully");
  },
  onError: (error) {
    print("Message failed: ${error.description}");
  },
));

// 確認正確調用 notifyListeners()
class MyState extends ChangeNotifier {
  String _data = '';
  
  set data(String value) {
    _data = value;
    notifyListeners(); // 重要：通知監聽者
  }
}

// 使用 Selector 而非 Consumer
Selector<MyState, String>(
  selector: (context, state) => state.data,
  builder: (context, data, child) {
    return Text(data);
  },
)

// 異步操作中檢查 mounted
Future<void> fetchData() async {
  final data = await api.getData();
  if (mounted) {
    setState(() {
      this.data = data;
    });
  }
}

// 正確使用 context.read() 和 context.watch()
// build 方法中用 watch，事件處理中用 read

// 使用 ListView.builder 代替 Column
ListView.builder(
  itemCount: items.length,
  itemBuilder: (context, index) {
    return ItemWidget(item: items[index]);
  },
)

// 使用 const 建構函數
const MyWidget({Key? key}) : super(key: key);

// 避免在 build 方法中進行重計算
class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Consumer<MyState>(
      builder: (context, state, child) {
        final expensiveData = _computeExpensiveData(state); // ❌ 每次都計算
        return Text(expensiveData);
      },
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  StreamSubscription? _subscription;
  Timer? _timer;
  
  @override
  void initState() {
    super.initState();
    _subscription = stream.listen(onData);
    _timer = Timer.periodic(Duration(seconds: 1), onTimer);
  }
  
  @override
  void dispose() {
    _subscription?.cancel(); // 重要：取消訂閱
    _timer?.cancel(); // 重要：取消計時器
    super.dispose();
  }
}

// 開發環境中使用
import 'package:flutter/foundation.dart';

void debugLog(String message) {
  if (kDebugMode) {
    debugPrint('[Debug] $message');
  }
}

import 'package:logger/logger.dart';

final logger = Logger();

logger.d('Debug message');
logger.i('Info message');
logger.w('Warning message');
logger.e('Error message');

// 添加調試輸出
class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    debugPrint('MyWidget is rebuilding');
    return Container();
  }
}