Flutter Firebase:如何从Firebase Auth调用显示名称和UID，然后使用这些值并保存在Cloud

Question

我有一个大学的项目，但我不知道如何从Firebase Auth调用显示名称和UID，然后使用这些值并保存在Cloud Firestore中。

我试着写下面的代码，但出现了一个错误。

//Call Display Name and UID From Firebase User
AuthNotifier authNotifier =
Provider.of<AuthNotifier>(context, listen: false);
String _currentDP = authNotifier.user.displayName;
String _currentUID = authNotifier.user.uid;
print('UID : $_currentUID');
print('Display Name : $_currentDP');
if (_currentInitRPP.ptk != null) {
_currentInitRPP.ptk = rppNotifier.currentInitRPP.ptk;
} else {
_currentInitRPP.ptk = _currentDP;
}
if (_currentInitRPP.uid != null) {
_currentInitRPP.uid = rppNotifier.currentInitRPP.uid;
return;
} else {
_currentInitRPP.uid = _currentUID;
}
// Code end here

请帮帮我。

完整代码

rpp_form.dart

import 'package:aplikasi_rpp/model/database.dart';
import 'package:aplikasi_rpp/notifier/auth_notifier.dart';
import 'package:aplikasi_rpp/notifier/rpp_notifier.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:aplikasi_rpp/api/api.dart';
class RPPForm extends StatefulWidget {
final bool isUpdating;
RPPForm({@required this.isUpdating});
@override
_RPPFormState createState() => _RPPFormState();
}
class _RPPFormState extends State<RPPForm> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
InitRPP _currentInitRPP;
@override
void initState() {
super.initState();
RPPNotifier rppNotifier = Provider.of<RPPNotifier>(context, listen: false);
//Call Display Name and UID From Firebase User
AuthNotifier authNotifier =
Provider.of<AuthNotifier>(context, listen: false);
String _currentDP = authNotifier.user.displayName;
String _currentUID = authNotifier.user.uid;
print('UID : $_currentUID');
print('Display Name : $_currentDP');
if (_currentInitRPP.ptk != null) {
_currentInitRPP.ptk = rppNotifier.currentInitRPP.ptk;
} else {
_currentInitRPP.ptk = _currentDP;
}
if (_currentInitRPP.uid != null) {
_currentInitRPP.uid = rppNotifier.currentInitRPP.uid;
return;
} else {
_currentInitRPP.uid = _currentUID;
}
// Code end here
if (rppNotifier.currentInitRPP != null) {
_currentInitRPP = rppNotifier.currentInitRPP;
} else {
_currentInitRPP = InitRPP();
}
}
Widget _buildMapelField() {
return TextFormField(
decoration: InputDecoration(labelText: 'Mata Pelajaran'),
initialValue: _currentInitRPP.mapel,
keyboardType: TextInputType.text,
style: TextStyle(fontSize: 18),
validator: (String value) {
if (value.isEmpty) {
return 'Form ini tidak boleh kosong';
}
return null;
},
onSaved: (String value) {
_currentInitRPP.mapel = value;
},
);
}
Widget _buildKelasField() {
return TextFormField(
decoration: InputDecoration(labelText: 'Kelas (Contoh: Kelas I)'),
initialValue: _currentInitRPP.kelas,
keyboardType: TextInputType.text,
style: TextStyle(fontSize: 18),
validator: (String value) {
if (value.isEmpty) {
return 'Form ini tidak boleh kosong';
}
return null;
},
onSaved: (String value) {
_currentInitRPP.kelas = value;
},
);
}
Widget _buildTahunFiled() {
return TextFormField(
decoration:
InputDecoration(labelText: 'Tahun Ajaran (Contoh: 2020/2021)'),
initialValue: _currentInitRPP.tahun,
keyboardType: TextInputType.text,
style: TextStyle(fontSize: 18),
validator: (String value) {
if (value.isEmpty) {
return 'Form ini tidak boleh kosong';
}
return null;
},
onSaved: (String value) {
_currentInitRPP.tahun = value;
},
);
}
Widget _buildSemesterField() {
return TextFormField(
decoration: InputDecoration(labelText: 'Semester (Ganjil/Genap)'),
initialValue: _currentInitRPP.semester,
keyboardType: TextInputType.text,
style: TextStyle(fontSize: 18),
validator: (String value) {
if (value.isEmpty) {
return 'Form ini tidak boleh kosong';
}
return null;
},
onSaved: (String value) {
_currentInitRPP.semester = value;
},
);
}
Widget _buildMateriField() {
return TextFormField(
decoration: InputDecoration(labelText: 'Materi'),
initialValue: _currentInitRPP.materi,
keyboardType: TextInputType.text,
style: TextStyle(fontSize: 18),
validator: (String value) {
if (value.isEmpty) {
return 'Form ini tidak boleh kosong';
}
return null;
},
onSaved: (String value) {
_currentInitRPP.materi = value;
},
);
}
_saveInitRPP() {
if (!_formKey.currentState.validate()) {
return;
}
_formKey.currentState.save();
uploadInitRPP(_currentInitRPP, widget.isUpdating, _onInitRPPUploaded);
print('mapel : ${_currentInitRPP.mapel}');
print('kelas : ${_currentInitRPP.kelas}');
print('tahun : ${_currentInitRPP.tahun}');
print('semester : ${_currentInitRPP.semester}');
print('materi : ${_currentInitRPP.materi}');
}
_onInitRPPUploaded(InitRPP initRPP) {
RPPNotifier rppNotifier = Provider.of<RPPNotifier>(context, listen: false);
rppNotifier.addInitRPP(initRPP);
Navigator.pop(context);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Form Data Awal RPP'),
),
body: SingleChildScrollView(
padding: EdgeInsets.all(10),
child: Form(
key: _formKey,
autovalidateMode: AutovalidateMode.always,
child: Column(
children: <Widget>[
Text(
widget.isUpdating ? 'Edit Data Awal RPP' : 'Buat Data Awal RPP',
textAlign: TextAlign.center,
style: TextStyle(fontSize: 20),
),
SizedBox(height: 20),
_buildMapelField(),
_buildKelasField(),
_buildTahunFiled(),
_buildSemesterField(),
_buildMateriField(),
],
),
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => _saveInitRPP(),
child: Icon(Icons.save),
foregroundColor: Colors.white,
),
);
}
}

调试控制台中的错误代码

The setter 'ptk=' was called on null.
Receiver: null
Tried calling: ptk="Person"
The relevant error-causing widget was
MaterialApp

Answer 1

我刚刚算出并修改了api.dart 中的代码

api.dart

uploadInitRPP(
InitRPP initRPP, bool isUpdating, Function initRPPUploaded) async {
CollectionReference initRPPRef = Firestore.instance.collection('RPP');
if (isUpdating) {
initRPP.updatedAt = Timestamp.now();
await initRPPRef.document(initRPP.id).updateData(initRPP.toMap());
initRPPUploaded(initRPP);
print('update Data Awal RPP dengan id: ${initRPP.id}');
} else {
initRPP.createdAt = Timestamp.now();
final FirebaseAuth auth = FirebaseAuth.instance;
final FirebaseUser user = await auth.currentUser();
final uid = user.uid;
final udn = user.displayName;
DocumentReference documentRef = await initRPPRef.add(initRPP.toMap());
initRPP.id = documentRef.documentID;
initRPP.uid = uid;
initRPP.ptk = udn;
print('unggah Data Awal RPP sukses: ${initRPP.toString()}');
await documentRef.setData(initRPP.toMap(), merge: true);
initRPPUploaded(initRPP);
}
}

Answer 2

一种方法是创建一个用户集合，并以用户id作为documentID存储用户数据，登录后使用用户id访问用户的所有详细信息。通过这种方式，您将能够将用户数据保存到云存储中，还可以获得姓名电子邮件等数据。您可以像这样将用户数据存储到cloudfirestore中。

final CollectionReference userCollection =
Firestore.instance.collection('userData');
Future<void> updateUserData(String name, String email, String phoneNumber,
String address, String type) async {
return await userCollection.document(uid).setData({
'Name': name,
'Email': email,
'Phone Number': phoneNumber,
'Address': address,
});

}