尝试使用电子邮件和密码创建帐户时，Flutter 应用程序崩溃

Posted 2023-02-23

【中文标题】尝试使用电子邮件和密码创建帐户时，Flutter 应用程序崩溃

【英文标题】：Flutter app is crashing when trying to creating account with email and password

【发布时间】：2019-05-22 17:45:25

【问题描述】：

这是我创建帐户的代码，但是当电子邮件 ID 已注册时，应用程序崩溃并且我的 try catch 方法无法捕获它。 如何解决这个问题？

void careteAccount() async 
if (in_email.text.trim().length > 0 && in_password.text.trim().length > 0) 
  try 
    //   FirebaseAuth.instance.verifyPhoneNumber(phoneNumber: "[phone]", codeAutoRetrievalTimeout: (String verificationId) , codeSent: (String verificationId, int forceResendingToken) , timeout: null, verificationCompleted: (FirebaseUser firebaseUser) , verificationFailed: (AuthException error) );

    FirebaseUser user = await FirebaseAuth.instance
        .createUserWithEmailAndPassword(
            email: in_email.value.text.trim(), password: in_password.value.text.trim())
            .catchError((e)
              print(e.toString());
              Fluttertoast.showToast(
        msg: e.toString(),
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.TOP,
        timeInSecForios: 1,
        backgroundColor: Colors.black54,
        textColor: Colors.white);
            )
            .then((u)
              if(u!=null?u.email!=null?true:false:false)
                print("account created "+u.email);
              else
                print("account creatin failed");
              
            );
    print("create accound in $user.email");
   catch (e) 
    print(e.toString());
    Fluttertoast.showToast(
        msg: e.toString(),
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.TOP,
        timeInSecForIos: 1,
        backgroundColor: Colors.black54,
        textColor: Colors.white);
    print('Error $e');
  
 else 
  print("login called and countroler is null");

错误消息“给定的密码无效。[密码应至少为 6 个字符]”

我需要以编程方式解决错误，而不是像上图那样

D/ (8896): HostConnection::get() 新主机连接建立 0xb40f0c90, tid 8923 D/EGL_emulation(8896): eglMakeCurrent：0xb42bc4c0：ver 2 0 W/BiChannelGoogleApi（8896）： [FirebaseAuth: ] getGoogleApiForMethod() 返回 Gms： com.google.firebase.auth.api.internal.zzal@3b1fc27b

成功创建帐户时出错

I/flutter ( 9012): account created [e-mail]
Unhandled exception:
NoSuchMethodError: The getter 'className' was called on null.
Receiver: null
Tried calling: className
#0      Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:50:5)
#1      serializeProcedure (package:front_end/src/fasta/kernel/utils.dart:99:29)
#2      FrontendCompiler.compileExpression (package:vm/frontend_server.dart:482:16)
<asynchronous suspension>
#3      _FlutterFrontendCompiler.compileExpression (package:frontend_server/server.dart:62:22)
#4      listenAndCompile.<anonymous closure> (package:vm/frontend_server.dart:797:20)
<asynchronous suspension>
#5      _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#6      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#7      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#8      _SinkTransformerStreamSubscription._add (dart:async/stream_transformers.dart:68:11)
#9      _EventSinkWrapper.add (dart:async/stream_transformers.dart:15:11)
#10     _StringAdapterSink.add (dart:convert/string_conversion.dart:268:11)
#11     _LineSplitterSink._addLines (dart:convert/line_splitter.dart:154:13)
#12     _LineSplitterSink.addSlice (dart:convert/line_splitter.dart:129:5)
#13     StringConversionSinkMixin.add (dart:convert/string_conversion.dart:189:5)
#14     _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:120:24)
#15     _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#16     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#17     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#18     _SinkTransformerStreamSubscription._add (dart:async/stream_transformers.dart:68:11)
#19     _EventSinkWrapper.add (dart:async/stream_transformers.dart:15:11)
#20     _StringAdapterSink.add (dart:convert/string_conversion.dart:268:11)
#21     _StringAdapterSink.addSlice (dart:convert/string_conversion.dart:273:7)
#22     _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:348:20)
#23     _Utf8ConversionSink.add (dart:convert/string_conversion.dart:341:5)
#24     _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:86:18)
#25     _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:120:24)
#26     _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#27     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#28     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)

【参考方案1】：

在 firebase 中，密码必须至少为 6 个字符。

【讨论】：

我需要在程序上捕获错误，而不是像崩溃错误

我不明白解决方案

你能帮帮我吗？

【参考方案2】：

为了使代码更安全，避免抛出异常，您必须在 firebase 中创建身份验证帐户或登录时检查代码是否抛出它

例如在你的状态中使用这个在你的 FirebaseAuthUtil class 中添加这个方法作为例子

static Future<dynamic> createEmailAndPassword(String email,String pass) async

    FirebaseAuth mAuth = FirebaseAuth.instance;


    try 
      AuthResult result =await mAuth.createUserWithEmailAndPassword(email: email, password: pass);

      FirebaseUser userFirebase = await mAuth.currentUser();
      if (userFirebase != null && result.user.uid == userFirebase.uid) 
        return userFirebase;
       else 
        return PlatformException(code: "-1", message: "error assign uid");
      
     on PlatformException catch (ex) 
      debugPrint("ex :$ex.code");
      return ex;
    

并从您的注册页面调用上述方法

dynamic result = FirebaseAuthUtil.createEmailAndPassword(email, pass);

    if(result is FirebaseUser )
      // create account is success
    else if(result is PlatformException)
      debugPrint("ereor signUp :$result.code");