在 flutter 中访问 firebase 用户的当前 uid 时出错

Question

我想用flutter获取当前用户的uid

我试过跟随但 returns 出错

final FirebaseAuth auth = FirebaseAuth.instance;
    void inputData() {
      final User user = auth.currentUser;
      final uid = user.uid;
      print(uid);
      // here you write the codes to input the data into firestore
    }

错误：

════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

Answer 1

你必须打电话给 Firebase.initializeApp()

import 'package:firebase_core/firebase_core.dart';

void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await Firebase.initializeApp();
   runApp(MyApp());
}

Answer 2

Firebase 现已更新，需要您在使用任何 Firebase 产品之前初始化 Firebase。 还要确保你的 pubspec.yaml 文件有 firebase_core:

dependencies:
  flutter:
    sdk: flutter
  firebase_core : ^0.5.0

并且主要在main.dart

的main函数中初始化Firebase

Firebase.initializeApp();