On the sign-up page when the user enters the email that was used before, this exception happens (Null check operator used on a null value)
[firebase_auth/email-already-in-use] The email address is already in use by another account.
════════ Exception caught by widgets library ═══════════════════════════════════ The following _CastError was thrown building Builder(dirty): Null check operator used on a null value
this is my code:
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:toto/main.dart';
import 'home.dart';
class CreateAccount extends StatefulWidget {
@override
_CreateAccountState createState() => _CreateAccountState();
}
class _CreateAccountState extends State<CreateAccount> {
//FirebaseAuth fireauth = FirebaseAuth.instance;
//FirebaseFirestore firestore = FirebaseFirestore.instance;
final _auth = FirebaseAuth.instance;
final _Key = GlobalKey<FormState>();
final emailController = TextEditingController();
final passwordController = TextEditingController();
final ageController = TextEditingController();
final usernameController = TextEditingController();
final nameController = TextEditingController();
final numericRegex = RegExp(r'[0-9]');
final CharRegex = RegExp(r'[!@#\$&*~]');
final LetterRegex = RegExp(r'[a-z A-Z]');
bool isVisible = false;
var errorMessage = '';
//--------------------------------------validations-----------------------
String? validateName(String? formName) {
final nameRegex = RegExp(
r'^[\u0600-\u065F\u066A-\u06EF\u06FA-\u06FFa-zA-Z] [\u0600-\u065F\u066A-\u06EF\u06FA-\u06FFa-zA-Z-_]{1,20}$');
if (formName == null || formName.isEmpty)
return 'الاسم مطلوب';
else if (!nameRegex.hasMatch(formName))
return 'يجب أن يتكون الأسم من حروف فقط';
else
return null;
}
String? validateEmail(String? formEmail) {
if (formEmail == null || formEmail.isEmpty)
return 'البريد الالكتروني مطلوب';
String pattern = r'\w @\w \.\w ';
RegExp regex = RegExp(pattern);
if (!regex.hasMatch(formEmail))
return 'صيغة البريد الالكتروني غير صحيحة';
else
return null;
}
String? validatePassword(String? formPassword) {
if (formPassword == null || formPassword.isEmpty)
return 'كلمة المرور مطلوبة';
else if (formPassword.length < 8)
return 'يجب ان تحتوي كلمة السر على 8 خانات أو أكثر';
else if (!numericRegex.hasMatch(formPassword) &&
!LetterRegex.hasMatch(formPassword))
return 'يجب أن تحتوي كلمة المرور على أرقام وحروف';
else
return null;
}
bool obscure_text = true;
Icon iconfirst = Icon(
Icons.visibility_off,
color: Color.fromARGB(255, 255, 255, 255),
);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body:
//SafeArea(
Container(
alignment: Alignment.center,
padding: const EdgeInsets.symmetric(vertical: 0.0, horizontal: 35.0),
//padding: const EdgeInsets.fromLTRB(0, 70, 0, 0),
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/housebg.png'),
fit: BoxFit.cover),
),
child: Center(
child: SingleChildScrollView(
child: Form(
key: _Key,
child: Column(
children: [
SizedBox(
height: 90,
),
Text(
"تسجيل حساب جديد",
style: TextStyle(
fontSize: 33.0,
color: Color.fromARGB(255, 29, 22, 13),
fontWeight: FontWeight.bold,
fontFamily: "ElMessiri"),
),
Padding(
padding: EdgeInsets.fromLTRB(0, 20, 0, 0),
),
//------------------------------name---------------------------------------
SizedBox(
height: 20.0,
),
Container(
alignment: Alignment.centerRight,
padding: EdgeInsets.fromLTRB(0, 0, 30, 0),
child: Text(
"الاسم",
textAlign: TextAlign.right,
style: TextStyle(
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 34, 75, 12),
fontWeight: FontWeight.bold,
),
),
),
TextFormField(
controller: nameController,
validator: validateName,
textAlign: TextAlign.right,
cursorColor: Color(0xFF90B28D),
decoration: InputDecoration(
fillColor: Colors.white,
counterText: "",
filled: true,
contentPadding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 10.0),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
suffixIcon: Icon(
Icons.person,
color: Color(0xFF90B28D),
),
hintText: "الاسم",
hintStyle: TextStyle(
color: Color(0xFF909A99),
),
),
),
//------------------------age---------------------
SizedBox(
height: 10.0,
),
Container(
alignment: Alignment.centerRight,
padding: EdgeInsets.fromLTRB(0, 0, 30, 0),
child: Text(
"العمر",
textAlign: TextAlign.right,
style: TextStyle(
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 34, 75, 12),
fontWeight: FontWeight.bold,
),
),
),
TextFormField(
controller: ageController,
textAlign: TextAlign.right,
cursorColor: Color(0xFF90B28D),
decoration: InputDecoration(
fillColor: Colors.white,
counterText: "",
filled: true,
contentPadding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 10.0),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
suffixIcon: Icon(
Icons.calendar_month,
color: Color(0xFF90B28D),
),
hintText: "العمر",
hintStyle: TextStyle(
color: Color(0xFF909A99),
),
),
keyboardType: TextInputType.number,
),
//------------------------Username-----------------------------
SizedBox(
height: 10.0,
),
Container(
alignment: Alignment.centerRight,
padding: EdgeInsets.fromLTRB(0, 0, 30, 0),
child: Text(
"اسم المستخدم",
textAlign: TextAlign.right,
style: TextStyle(
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 34, 75, 12),
fontWeight: FontWeight.bold,
),
),
),
TextFormField(
controller: usernameController,
validator: (value) {
////////// validator /////////////
if (value!.isEmpty) {
return 'يجب ادخال اسم المستخدم';
} else if (value.contains('0')) {
// اشيك في الداتابيس
return 'اسم المستخدم محجوز';
} else
return null;
},
textAlign: TextAlign.right,
decoration: InputDecoration(
fillColor: Colors.white.withOpacity(0.9),
filled: true,
counterText: "",
contentPadding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 10.0),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
suffixIcon: Icon(
Icons.account_box,
color: Color(0xFF90B28D),
),
hintText: "اسم المستخدم",
hintStyle: TextStyle(
color: Color(0xFF909A99),
),
),
),
//-----------------------------email----------------------------------
SizedBox(
height: 10.0,
),
Container(
alignment: Alignment.centerRight,
padding: EdgeInsets.fromLTRB(0, 0, 30, 0),
child: Text(
"البريد الإلكتروني",
textAlign: TextAlign.right,
style: TextStyle(
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 34, 75, 12),
fontWeight: FontWeight.bold,
),
),
),
TextFormField(
controller: emailController,
autovalidateMode: AutovalidateMode.onUserInteraction,
validator: validateEmail,
textAlign: TextAlign.right,
cursorColor: Color(0xFF90B28D),
decoration: InputDecoration(
fillColor: Colors.white.withOpacity(0.9),
counterText: "",
filled: true,
contentPadding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 10.0),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
suffixIcon: Icon(
Icons.mail,
color: Color(0xFF90B28D),
),
hintText: '[email protected]',
hintStyle: TextStyle(
color: Color(0xFF909A99),
),
),
keyboardType: TextInputType.emailAddress,
),
//-------------------------------password-----------------------------
SizedBox(
height: 10.0,
),
Container(
alignment: Alignment.centerRight,
padding: EdgeInsets.fromLTRB(0, 0, 30, 0),
child: Text(
"كلمة المرور",
textAlign: TextAlign.right,
style: TextStyle(
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 34, 75, 12),
fontWeight: FontWeight.bold,
),
),
),
TextFormField(
controller: passwordController,
validator: validatePassword,
textAlign: TextAlign.right,
obscureText: obscure_text,
decoration: InputDecoration(
fillColor: Colors.white.withOpacity(0.9),
counterText: "",
filled: true,
contentPadding: const EdgeInsets.symmetric(
vertical: 10.0, horizontal: 10.0),
border: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
enabledBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.white),
borderRadius: BorderRadius.circular(30)),
suffixIcon: Icon(
Icons.lock,
color: Color(0xFF90B28D),
),
prefixIcon: GestureDetector(
onTap: () {
setState(() {
if (obscure_text == true) {
obscure_text = false;
iconfirst = Icon(
Icons.visibility,
color: Color(0xFF90B28D),
);
} else {
obscure_text = true;
iconfirst = Icon(
Icons.visibility_off,
color: Colors.grey.shade300,
);
}
});
},
child: iconfirst,
),
hintText: "كلمة المرور",
hintStyle: TextStyle(
color: Color(0xFF909A99),
),
),
),
SizedBox(
height: 20.0,
),
Padding(
padding: EdgeInsets.fromLTRB(0, 20, 0, 0),
),
ElevatedButton(
onPressed: () async {
register(emailController.text.trim(),
passwordController.text);
},
style: ElevatedButton.styleFrom(
fixedSize: Size(280, 40),
backgroundColor: Color(0xFFA03C1B),
elevation: 0.0,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(30),
),
)),
child: Text(
"تسجيل ",
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: "ElMessiri",
fontSize: 22.0,
color: Colors.white),
textAlign: TextAlign.center,
),
),
//////////////////////////////////////// have an account
Container(
child: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
TextButton(
onPressed: main,
style: ButtonStyle(
alignment: Alignment.center,
),
child: Text(
"تسجيل دخول",
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 0, 0, 0)),
),
),
Text(
"لديك حساب؟",
style: TextStyle(
fontWeight: FontWeight.bold,
fontFamily: "ElMessiri",
fontSize: 16.0,
color: Color.fromARGB(255, 0, 0, 0)),
),
],
),
),
),
],
),
),
),
),
),
),
);
}
void register(String email, String password) async {
if (_Key.currentState!.validate()) {
try {
await _auth
.createUserWithEmailAndPassword(email: email, password: password)
.then((value) => {postDetailsToFirestore()});
} on FirebaseAuthException catch (error) {
print(error);
errorMessage = error.message!;
Map<String, String?> codeResponses = {
// Re-auth responses
"user-mismatch": 'المستخدم غير متطابق',
"user-not-found": 'لم يتم العثور على المستخدم',
"invalid-credential": 'invalid credential',
"invalid-email": 'الايميل غير موجود',
"wrong-password": 'كلمة المرور الحالية خاطئة',
"invalid-verification-code": 'رمز التحقق غير صالح',
"invalid-verification-id": 'معرّف التحقق غير صالح',
"user-disabled": 'المستخدم لهذا الايميل معطّل',
"too-many-requests": 'طلبات كثيرة',
"operation-not-allowed":
'تسجيل الدخول من خلال الايميل وكلمة المرور غير مسموح',
// Update password error codes
"weak-password": 'كلمة المرور غير قوية',
"requires-recent-login": 'يتطلب تسجيل دخول حديث'
};
showDialog(
context: context,
builder: (context) {
return AlertDialog(
content: Text(codeResponses[error.code]!),
actions: [
TextButton(
onPressed: () => Navigator.pop(context, 'حسنًا'),
child: const Text('حسنًا'),
)
]);
});
}
}
}
postDetailsToFirestore() async {
User? user = _auth.currentUser;
try {
await FirebaseFirestore.instance.collection("users").doc(user?.uid).set({
'userID': user?.uid,
'name': nameController.text,
'age': ageController.text,
'username': usernameController.text,
'email': emailController.text,
});
print(nameController.text);
print(ageController.text);
print(usernameController.text);
print(emailController.text);
//if(ageController.text>='60'){
Navigator.pushAndRemoveUntil((context),
MaterialPageRoute(builder: (context) => home()), (route) => false);
} on FirebaseAuthException catch (error) {
errorMessage = error.message!;
}
}
}
CodePudding user response：
Two ways to fix this,
- Make the below change
showDialog(
context: context,
builder: (context) {
return AlertDialog(
// add -> ?? "Unknown Error" to below line
content: Text(codeResponses[error.code] ?? "Unknown error"),
actions: [
TextButton(
onPressed: () => Navigator.pop(context, 'حسنًا'),
child: const Text('حسنًا'),
)
]);
});
Or
- Add
email-already-in-usetocodeResponses
Map<String, String?> codeResponses = {
// Re-auth responses
"user-mismatch": 'المستخدم غير متطابق',
"user-not-found": 'لم يتم العثور على المستخدم',
"email-already-in-use" : 'Email already in use',