E / MethodChannel＃plugins.flutter.io / firebase_auth16707：java.lang.IllegalArgumentException：给定的String为空或null

分类：编程问答

如何解决E / MethodChannel＃plugins.flutter.io / firebase_auth16707：java.lang.IllegalArgumentException：给定的String为空或null

我在使用Firebase进行电子邮件身份验证时遇到问题。我不知道如何解决它，尽管我尝试了许多在线建议，但这些建议似乎都不起作用，所以我有点被这件事卡住了

代码-

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter_facebook_login/flutter_facebook_login.dart';
import 'package:flutter_auth/main.dart';





class Body extends StatefulWidget {


@override
_BodyState createState() => _BodyState();
} 

class _BodyState extends State<Body> {
final _formKey = GlobalKey<FormState>();


TextEditingController _emailController = TextEditingController();
TextEditingController _passwordController = TextEditingController();




@override

Widget build(BuildContext context) {
Size size = MediaQuery
    .of(context)
    .size;
return Background(
  child: SingleChildScrollView(
    child: Form(
      key: _formKey,child: Column(
        mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
          Text(
            "SIGNUP",style: TextStyle(fontWeight: FontWeight.bold),),SizedBox(height: size.height * 0.03),SvgPicture.asset(
            "assets/icons/signup.svg",height: size.height * 0.35,RoundedInputField(
            hintText: "Your Email",onChanged: (val) {
            },RoundedPasswordField(
            onChanged: (val) {
            },RoundedButton(
              text: "SIGNUP",press: ()
              async {
                try {
                  FirebaseUser user = (await FirebaseAuth.instance
                      .createUserWithEmailAndPassword(
                    email: _emailController.text,password: _passwordController.text,)).user;
                  if(user != null){
                    UserUpdateInfo updateUser = UserUpdateInfo();
                    user.updateProfile(updateUser);
                    Navigator.of(context).pushNamed(AppRoutes.menu);
                  }
                } catch (e) {
                  print(e);
                  _passwordController.text = "";
                  _emailController.text = "";
                  // TODO: alertdialog with error
                }
              },AlreadyHaveAnAccountCheck(
            login: false,press: () {
              Navigator.push(
                context,MaterialPageRoute(
                  builder: (context) {
                    return LoginScreen();
                  },);
            },OrDivider(),Row(
            mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
              SocalIcon(
                iconSrc: "assets/icons/fbb.svg",press: () => signUpWithFacebook(),SocalIcon(
                iconSrc: "assets/icons/twitterr.svg",press: () {},SocalIcon(
                iconSrc: "assets/icons/google.svg",press: () => _signIn(context),],)
                ],);
                }

圆形的输入字段-

import 'package:flutter/material.dart';
import 
'package:flutter_auth/login_Signup/components/text_field_container.dart';
 import 'package:flutter_auth/constants.dart';
Import 'package:firebase_auth/firebase_auth.dart';
import 
'package:flutter_auth/login_Signup/Screens/Signup/components/body.dart';

class RoundedInputField extends StatefulWidget {


final String hintText;
 final IconData icon;
final ValueChanged<String> onChanged;
const RoundedInputField({
Key key,this.hintText,this.icon = Icons.person,this.onChanged,}) : super(key: key);

@override
Widget build(BuildContext context) {
return TextFieldContainer(
  child: TextFormField(
    controller: _emailController,onChanged: widget.onChanged,cursorColor: kPrimaryColor,decoration: InputDecoration(
      icon: Icon(
        widget.icon,color: kPrimaryColor,hintText: widget.hintText,border: InputBorder.none,);
  }
  }

我的调试控制台!!-

E/MethodChannel#plugins.flutter.io/firebase_auth(16707): Failed to handle 
method call
E/MethodChannel#plugins.flutter.io/firebase_auth(16707): 
java.lang.IllegalArgumentException: Given String is empty or null
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):                        
at 
com.google.android.gms.common.internal.Preconditions.checkNotEmpty(com.google.android.gms:play-services-basement@@17.1.1:5)
    E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at 
com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword(com.google.firebase:firebase-auth@@19.3.2:288)
   E/MethodChannel#plugins.flutter.io/firebase_auth(16707):     at 
io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.handleCreateUserWithEmailAndPa 
   ssword(FirebaseAuthPlugin.java:361)
   E/MethodChannel#plugins.flutter.io/firebase_auth(16707):     at 
io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.onMethodCall(FirebaseAuthPlugin.java:143)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:230)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.MessageQueue.next(MessageQueue.java:335)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.Looper.loop(Looper.java:183)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.app.ActivityThread.main(ActivityThread.java:7656)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
I/flutter (16707): PlatformException(error,Given String is empty or null,null)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707): Failed to handle method call
E/MethodChannel#plugins.flutter.io/firebase_auth(16707): java.lang.IllegalArgumentException: Given String is empty or null
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.google.android.gms.common.internal.Preconditions.checkNotEmpty(com.google.android.gms:play-services-basement@@17.1.1:5)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.google.firebase.auth.FirebaseAuth.createUserWithEmailAndPassword(com.google.firebase:firebase-auth@@19.3.2:288)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.handleCreateUserWithEmailAndPassword(FirebaseAuthPlugin.java:361)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.plugins.firebaseauth.FirebaseAuthPlugin.onMethodCall(FirebaseAuthPlugin.java:143)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:230)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:85)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:692)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.MessageQueue.next(MessageQueue.java:335)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.os.Looper.loop(Looper.java:183)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at android.app.ActivityThread.main(ActivityThread.java:7656)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
E/MethodChannel#plugins.flutter.io/firebase_auth(16707):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
I/flutter (16707): PlatformException(error,null)

似乎我将一个空字符串放在某个地方，但是由于添加的自定义文本字段或类似内容，我似乎无法弄清我的感觉。任何帮助将不胜感激！

解决方法

.createUserWithEmailAndPassword(
                    email: _emailController.text,password: _passwordController.text,)

此方法中的email和password均为空。您必须使用TextFormField并将控制器绑定到它，然后才能访问text，例如：

        body: Form(
            key: _formKey,child: SingleChildScrollView(
                child: Column(children: <Widget>[
              Padding(
                padding: EdgeInsets.all(20.0),child: TextFormField(
                  controller: emailController,decoration: InputDecoration(
                    labelText: "Enter Email Address",enabledBorder: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(10.0),),// The validator receives the text that the user has entered.
                  validator: (value) {
                    if (value.isEmpty) {
                      return 'Enter Email Address';
                    }
                    else if(!value.contains('@')){
                      return 'Please enter a valid email address!';
                    }
                    return null;
                  },Padding(
                padding: EdgeInsets.all(20.0),child: TextFormField(
                  obscureText: true,controller: passwordController,decoration: InputDecoration(
                    labelText: "Enter Password",// The validator receives the text that the user has entered.
                  validator: (value) {
                    if (value.isEmpty) {
                      return 'Enter Password';
                    } else if (value.length < 6) {
                      return 'Password must be atleast 6 characters!';
                    }
                    return null;
                  },

检查文档

https://flutter.dev/docs/cookbook/forms/text-field-changes#2-use-a-texteditingcontroller

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