需要帮助从 Cloud Firestore 访问当前用户的信息并将信息包含在我的应用程序中

如何解决需要帮助从 Cloud Firestore 访问当前用户的信息并将信息包含在我的应用程序中

这是我想要访问并包含从 Firestore 登录用户数据的用户

class CategorySelector extends StatefulWidget {
  @override
  _CategorySelectorState createState() => _CategorySelectorState();
}

class _CategorySelectorState extends State<CategorySelector> {

  Future<Widget> _getImage(BuildContext context,String imageName) async{
    Image image;
    await FireStorageService.loadImage(context,imageName).then((value){
      image = Image.network(value.toString(),fit: BoxFit.cover,);
    });
    return image;
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 100.0,width: double.infinity,child: Row(
        crossAxisAlignment: CrossAxisAlignment.stretch,mainAxisAlignment: MainAxisAlignment.spaceBetween,children: <Widget>[
          Container(
            width: 80.0,height: 80.0,margin: EdgeInsets.only(left: 10.0),decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(20.0),boxShadow: [
                  BoxShadow(
                    //color: Color.fromRGBO(143,148,251,.2),color: Colors.black12,blurRadius: 5.0,offset: Offset(8,8)
                  )
                ]
            ),child: ClipRRect(
                borderRadius: BorderRadius.circular(20.0),child: FutureBuilder(
                future: _getImage(context,"Screenshot_2020-12-12-07-27-13-73.png"),builder: (context,snapshot){
                  //if(snapshot.connectionState == ConnectionState.done){
                    return Container(
                      width: 80.0,child: snapshot.data,);
                  //}
                },),/*child: Image(
                image: AssetImage(user.imageUrl),*/
          ),Column(
            mainAxisAlignment: MainAxisAlignment.center,crossAxisAlignment: CrossAxisAlignment.start,children: <Widget>[
              Text('Welcome,',style: TextStyle(
                  fontFamily: 'Roboto',color: Colors.grey,fontSize: 20.0,Text('hi',color: Colors.black54,fontWeight: FontWeight.bold,],Container(
            margin: EdgeInsets.only(right: 10.0),width: 80.0,child: Image(
              image: AssetImage('assets/images/logo.png'),);
  }
}

class FireStorageService extends ChangeNotifier{
  FireStorageService();
  static Future<dynamic> loadImage(BuildContext context,String image) async {
    return await FirebaseStorage.instance.ref().child(image).getDownloadURL();
  }
}

---

我为用户身份验证创建了这个类

class AuthenticationService {
  final FirebaseAuth _auth = FirebaseAuth.instance;

  //user registration with email and password
  Future<User> createNewUser(String email,String password,String imageUrl) async {
    try{
      UserCredential result = await _auth
          .createUserWithEmailAndPassword(email: email,password: password);

      User user = result.user;
      print('auth ser $imageUrl');
      if(user != null) {
        await DatabaseManager().createUserData(user.email,imageUrl,user.uid);
        return user;
      }
      return null;
    }catch(e){
      return null;
    }
  }

  //user sign in with email and password
  Future loginUser(String email,String password) async {
    try{
      UserCredential result = await _auth.signInWithEmailAndPassword(email: email,password: password);
      return result.user;
    }catch(e){
      print(e.toString());
      return null;
    }
  }





*//i think this function will help me to access current user's information,but it did not help*
  Future<User> getCurrentUser()async{
    User user =  _auth.currentUser;
    return user;
  }
}

---

这是我包含所有数据库操作的地方。

class DatabaseManager {
  final CollectionReference users = FirebaseFirestore.instance.collection('users');

  Future<void> createUserData( String email,String imageUrl,String uid) async{
    return await users.doc(uid).set({
      'id': uid,'email': email,'user_name': email.substring(0,email.lastIndexOf("@")),'img_url': imageUrl
    });
  }
}

---

这是我的用户模型

import 'package:flutter/foundation.dart';

class User {
   int id;
   String name;
   String email;
   String imageUrl;
   String password;

  User({
    @required this.id,@required this.name,@required this.imageUrl,@required this.email,@required this.password,});

  User.fromMap(Map<String,dynamic> json){
    this.id = json['id'];
    this.name = json['name'];
    this.imageUrl = json['img_url'];
    this.email = json['email'];
    this.password = json['password'];

  }
}

我真的不知道如何从 firebase 检索登录用户的信息。 我想从 firestore 访问存储在 firebase 存储中的图像和用户名，并通过 class categorySelector 显示在我的应用中。 非常感谢您的帮助。这就是我构建用户集合的方式。

解决方法

如果您使用 Firebase Auth，您可以访问简单的数据，例如姓名、电子邮件和电话号码等，您可以使用

FirebaseAuth.instance.currentUser

否则，如果您想访问 Firestore 中的数据，我建议您阅读 documentation 并自行学习，而不是获取有关如何操作的一次性代码。