PlatformException(error, Given String is empty or null, null) 错误颤动
Posted
技术标签:
【中文标题】PlatformException(error, Given String is empty or null, null) 错误颤动【英文标题】：PlatformException(error, Given String is empty or null, null) error flutter 【发布时间】：2020-09-24 06:06:50 【问题描述】：嘿，伙计们，我正在尝试在我的应用程序中使用登录系统，但进度条始终显示登录但从未登录我可以注册，而且我可以在控制台的 firestore bur 端看到用户详细信息我收到了那个错误 "PlatformException(error, Given String is empty or null, null) error" 如果您有任何建议，是否可以解决该错误，请告诉我谢谢
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:resat/src/pages/LoginPages/model/User.dart';
import 'package:resat/src/pages/LoginPages/ui/home/HomeScreen.dart';
import 'package:resat/src/pages/LoginPages/ui/services/Authenticate.dart';
import 'package:resat/src/pages/LoginPages/ui/utils/helper.dart';
import 'package:http/http.dart' as http;
import '../../constants.dart' as Constants;
import '../../main.dart';
final _fireStoreUtils = FireStoreUtils();
class LoginScreen extends StatefulWidget
@override
State createState()
return _LoginScreen();
class _LoginScreen extends State<LoginScreen>
TextEditingController _emailController = new TextEditingController();
TextEditingController _passwordController = new TextEditingController();
GlobalKey<FormState> _key = new GlobalKey();
bool _validate = false;
String email, password;
@override
Widget build(BuildContext context)
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.transparent,
iconTheme: IconThemeData(color: Colors.black),
elevation: 0.0,
),
body: Form(
key: _key,
autovalidate: _validate,
child: ListView(
children: <Widget>[
Padding(
padding:
const EdgeInsets.only(top: 32.0, right: 16.0, left: 16.0),
child: Text(
'Sign In',
style: TextStyle(
color: Color(Constants.COLOR_PRIMARY),
fontSize: 25.0,
fontWeight: FontWeight.bold),
),
),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding:
const EdgeInsets.only(top: 32.0, right: 24.0, left: 24.0),
child: TextFormField(
textAlignVertical: TextAlignVertical.center,
textInputAction: TextInputAction.next,
validator: validateEmail,
onSaved: (String val)
email = val;
,
onFieldSubmitted: (_) =>
FocusScope.of(context).nextFocus(),
controller: _emailController,
style: TextStyle(fontSize: 18.0),
keyboardType: TextInputType.emailAddress,
cursorColor: Color(Constants.COLOR_PRIMARY),
decoration: InputDecoration(
contentPadding:
new EdgeInsets.only(left: 16, right: 16),
fillColor: Colors.white,
hintText: 'E-mail Address',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(Constants.COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))),
),
),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding:
const EdgeInsets.only(top: 32.0, right: 24.0, left: 24.0),
child: TextFormField(
textAlignVertical: TextAlignVertical.center,
validator: validatePassword,
onSaved: (String val)
email = val;
,
onFieldSubmitted: (password) async
await onClick(_emailController.text, password);
,
textInputAction: TextInputAction.done,
style: TextStyle(fontSize: 18.0),
cursorColor: Color(Constants.COLOR_PRIMARY),
decoration: InputDecoration(
contentPadding:
new EdgeInsets.only(left: 16, right: 16),
fillColor: Colors.white,
hintText: 'Password',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(Constants.COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))),
),
),
Padding(
padding:
const EdgeInsets.only(right: 40.0, left: 40.0, top: 40),
child: ConstrainedBox(
constraints: const BoxConstraints(minWidth: double.infinity),
child: RaisedButton(
color: Color(Constants.COLOR_PRIMARY),
child: Text(
'Log In',
style:
TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
),
textColor: Colors.white,
splashColor: Color(Constants.COLOR_PRIMARY),
onPressed: () async
await onClick(
_emailController.text, _passwordController.text);
,
padding: EdgeInsets.only(top: 12, bottom: 12),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(25.0),
side:
BorderSide(color: Color(Constants.COLOR_PRIMARY))),
),
),
),
Padding(
padding: const EdgeInsets.all(32.0),
child: Center(
child: Text(
'OR',
style: TextStyle(color: Colors.black),
),
),
),
],
),
),
);
onClick(String email, String password) async
if (_key.currentState.validate())
_key.currentState.save();
showProgress(context, 'Logging in, please wait...', false);
User user =
await loginWithUserNameAndPassword(email, password.trim());
if (user != null)
pushAndRemoveUntil(context, HomeScreen(user: user), false);
else
setState(()
_validate = true;
);
Future<User> loginWithUserNameAndPassword(String email,
String password) async
try
AuthResult result = await FirebaseAuth.instance
.signInWithEmailAndPassword(email: email, password: password);
DocumentSnapshot documentSnapshot = await FireStoreUtils.firestore
.collection(Constants.USERS)
.document(result.user.uid)
.get();
User user;
if (documentSnapshot != null && documentSnapshot.exists)
user = User.fromJson(documentSnapshot.data);
user.active = true;
await _fireStoreUtils.updateCurrentUser(user, context);
hideProgress();
MyAppState.currentUser = user;
return user;
catch (exception)
hideProgress();
switch ((exception as PlatformException).code)
case 'ERROR_INVALID_EMAIL':
showAlertDialog(
context, 'Couldn\'t Authinticate', 'email address is malformed');
break;
case 'ERROR_WRONG_PASSWORD':
showAlertDialog(context, 'Couldn\'t Authinticate', 'wrong password');
break;
case 'ERROR_USER_NOT_FOUND':
showAlertDialog(context, 'Couldn\'t Authinticate',
'no user corresponding to the given email address');
break;
case 'ERROR_USER_DISABLED':
showAlertDialog(
context, 'Couldn\'t Authinticate', 'user has been disabled');
break;
case 'ERROR_TOO_MANY_REQUESTS':
showAlertDialog(context, 'Couldn\'t Authinticate',
'too many attempts to sign in as this user');
break;
case 'ERROR_OPERATION_NOT_ALLOWED':
showAlertDialog(context, 'Couldn\'t Authinticate',
'Email & Password accounts are not enabled');
break;
print(exception.toString());
return null;
@override
void dispose()
_emailController.dispose();
_passwordController.dispose();
super.dispose();
【问题讨论】：
你在哪一行得到错误.. 我在登录时遇到错误，所有行都在工作，只是没有登录 【参考方案1】：您需要将_passwordController 绑定到该字段：
child: TextFormField(
textAlignVertical: TextAlignVertical.center,
validator: validatePassword,
onSaved: (String val)
email = val;
,
onFieldSubmitted: (password) async
await onClick(_emailController.text, _passwordController.text);
,
controller : _passwordController,
textInputAction: TextInputAction.done,
style: TextStyle(fontSize: 18.0),
【讨论】：
以上是关于PlatformException(error, Given String is empty or null, null) 错误颤动的主要内容，如果未能解决你的问题，请参考以下文章
未处理的异常：PlatformException（错误，java.lang.IllegalStateException：尝试创建已创建的平台视图，视图 ID：0
PlatformException（错误，java.lang.IllegalStateException：尝试创建未注册类型的平台视图：plugins.flutter.io/webview
flutter_local_notifications：“PlatformException（PlatformException（INVALID_ICON，找不到资源））
PlatformException (PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: