如何注册电话号码并保持登录状态，直到我注销。我正在使用flutter，我已经可以使用电话号码注册用户，但是当重新打开该应用程序时，它将从登录页面开始。
想法是在注册后甚至关闭应用程序后仍保持登录状态。而且我也无法通过圆形指示器显示应用程序正在加载（如果您也向我展示了如何执行此操作，我会非常喜欢的）
这是我的代码。
import 'package:country_code_picker/country_code_picker.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'BottomBarPages/home.dart';
class SignIn extends StatefulWidget {
@override
_SignInState createState() => _SignInState();
}
class _SignInState extends State<SignIn> {
TextEditingController phoneController = new TextEditingController();
String phoneNumber = "";
bool shower = false;
String smsCode;
String verificationCode;
void _onCountryChange(CountryCode countryCode) {
this.phoneNumber = countryCode.toString();
print("New Country selected: " + countryCode.toString());
}
void check() {
final myPhone = this.phoneNumber + phoneController.text;
print("Full Text: " + myPhone);
}
Future<void> man() async{
}
Future<void> submit() async {
final myPhone = this.phoneNumber + phoneController.text;
final PhoneVerificationCompleted verificationCompleted =
(AuthCredential credential) {
setState(() {
print(credential);
});
};
final PhoneVerificationFailed verificationFailed =
(AuthException exception) {};
final PhoneCodeSent phoneCodeSent = (String verId, [int forceCodeResend]) {
this.verificationCode = verId;
smsCodeDialog(context).then((value) => print("signed"));
};
final PhoneCodeAutoRetrievalTimeout autoRetrievalTimeout = (String verId) {
this.verificationCode = verId;
};
await FirebaseAuth.instance.verifyPhoneNumber(
phoneNumber: myPhone,
timeout: const Duration(seconds: 5),
verificationCompleted: verificationCompleted,
verificationFailed: verificationFailed,
codeSent: phoneCodeSent,
codeAutoRetrievalTimeout: autoRetrievalTimeout);
}
Future<bool> smsCodeDialog(BuildContext context) {
return showDialog(
context: context,
barrierDismissible: false,
builder: (BuildContext context) {
return AlertDialog(
title: Text(
'Enter Code',
style: TextStyle(color: Colors.lightGreen, fontSize: 24),
),
content: TextField(
keyboardType: TextInputType.number,
onChanged: (Value) {
smsCode = Value;
},
),
contentPadding: EdgeInsets.all(10),
actions: [
FlatButton(
onPressed: () {
FirebaseAuth.instance.currentUser().then((user) {
if (user != null) {
Navigator.of(context).pop();
Navigator.push(context,
MaterialPageRoute(builder: (context) => Home()));
} else {
Navigator.of(context).pop();
signIn();
}
});
},
child: Text(
'Verify',
style: TextStyle(fontSize: 20, color: Colors.lightGreen),
))
],
);
});
// CircularProgressIndicator(
// valueColor: new AlwaysStoppedAnimation<Color>(Colors.lightGreen),
// value: 0.25,
// );
}
signIn() {
AuthCredential phoneAuthCredential = PhoneAuthProvider.getCredential(
verificationId: verificationCode, smsCode: smsCode);
FirebaseAuth.instance
.signInWithCredential(phoneAuthCredential)
.then((user) => Navigator.push(
context, MaterialPageRoute(builder: (context) => Home())))
.catchError((e) => print(e));
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
child: Scaffold(
body: Column(
//mainAxisAlignment: MainAxisAlignment.start,
children: [
Expanded(
flex: 1,
child: Container(
height: MediaQuery.of(context).size.height,
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
stops: [0.1, 0.3, 1.0],
colors: [
Colors.lightGreen[300],
Colors.white,
Colors.lightGreen[50]
],
),
),
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 15),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
SizedBox(
height: 150,
child: Image.asset('images/phone.png'),
),
SizedBox(
height: 20,
),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 20),
child: Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(50),
border: Border.all(color: Colors.lightGreen)),
width: double.infinity,
height: 40,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 30),
child: Row(
// crossAxisAlignment: CrossAxisAlignment.start,
//mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
CountryCodePicker(
dialogTextStyle: TextStyle(fontSize: 20),
onChanged: _onCountryChange,
initialSelection: 'US',
favorite: ['+251', 'ET'],
),
Padding(
padding: const EdgeInsets.only(bottom: 10),
child: SizedBox(
width: 150,
child: TextFormField(
controller: phoneController,
keyboardType: TextInputType.phone,
decoration: InputDecoration(
border: InputBorder.none,
),
),
),
),
],
),
),
),
),
SizedBox(
height: 20,
),
MaterialButton(
onPressed: submit,
minWidth: MediaQuery.of(context).size.width - 80,
height: 45,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
color: Colors.lightGreen,
splashColor: Colors.green,
child: Text(
"Confirm",
style: TextStyle(color: Colors.white, fontSize: 18),
),
),
Padding(
padding:
EdgeInsets.symmetric(vertical: 14, horizontal: 64),
child: Text(
"you'll receive a 6 digit code click Confirm to verify",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 22,
color: Colors.lightGreen,
),
),
),
],
),
),
),
),
],
),
),
);
}
}
请帮助我。
答案 0 :(得分：0)
打开应用程序时，请使用以下命令检查用户是否已经登录：
User user = FirebaseAuth.instance.currentUser;
如果用户不为null，则应将应用导航到主屏幕或其他屏幕。尝试以下代码：
@override
void initState() {
super.initState();
getUser();
}
getUser() {
User firebaseUser = FirebaseAuth.instance.currentUser;
if (firebaseUser != null)
WidgetsBinding.instance.addPostFrameCallback((_) =>
Navigator.pushReplacement(
context, MaterialPageRoute(builder: (context) => HomePage())));
}