5.firestore

import 'package:cloud_firestore/cloud_firestore.dart';

final FirebaseFirestore _firestore = FirebaseFirestore.instance;

// 添加數據到 Cloud Firestore
void addData() {
Map<String, dynamic> data = {
    'name': 'John Doe',
    'age': 30,
    // 其他字段
};

_firestore
    .collection('users')
    .add(data)
    .then((value) => print("Data added successfully"))
    .catchError((error) => print("Failed to add data: $error"));
}

// 從 Cloud Firestore 讀取數據
void fetchData() {
    _firestore.collection('users').get().then((QuerySnapshot querySnapshot) {
        querySnapshot.docs.forEach((doc) {
        print('Data: ${doc.id} => ${doc.data()}');
        });
    }).catchError((error) => print("Failed to fetch data: $error"));
}

import 'package:firebase_ui_auth/firebase_ui_auth.dart';
import 'package:flutter/material.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'data.dart'; // 導入 firestore_service.dart 文件

class HomeScreen extends StatelessWidget {
    const HomeScreen({super.key});

    @override
    Widget build(BuildContext context) {
        return HomePage();
    }
}

class HomePage extends StatefulWidget {
    @override
    _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
    @override
    void initState() {
        super.initState();
        fetchData(); // 調用 fetchData 函數
    }

    @override
    Widget build(BuildContext context) {
        return Scaffold(
        appBar: AppBar(
            actions: [
            IconButton(
                icon: const Icon(Icons.person),
                onPressed: () async {
                var user = FirebaseAuth.instance.currentUser;
                if (user != null) {
                    // 如果用戶已登入，則導航到 ProfileScreen
                    Navigator.push(
                    context,
                    MaterialPageRoute<ProfileScreen>(
                        builder: (context) => ProfileScreen(
                        appBar: AppBar(
                            title: const Text('User Profile'),
                        ),
                        actions: [
                            SignedOutAction((context) {
                            Navigator.of(context).pop();
                            })
                        ],
                        children: [
                            const Divider(),
                            Padding(
                            padding: const EdgeInsets.all(2),
                            child: AspectRatio(
                                aspectRatio: 1,
                                child: Image.asset('flutterfire_300x.png'),
                            ),
                            ),
                        ],
                        ),
                    ),
                    );
                } else {
                    // 如果用戶未登入，則顯示一個提示
                    ScaffoldMessenger.of(context).showSnackBar(
                    const SnackBar(content: Text('請先登入')),
                    );
                }
                },
            )
            ],
            automaticallyImplyLeading: false,
        ),
        body: Center(
            child: Column(
            children: [
                Image.asset('dash.png'),
                IconButton(
                    onPressed: () {
                    addData();
                    },
                    icon: Icon(Icons.add)),
                IconButton(
                    onPressed: () {
                    fetchData();
                    },
                    icon: Icon(Icons.remove)),
                Text(
                'Welcome!',
                style: Theme.of(context).textTheme.displaySmall,
                ),
                const SignOutButton(),
            ],
            ),
        ),
        );
    }
}