当我单击“创建帐户”时，没有任何反应。在调试控制台viewpostime指针上点击

Question

我使用Flutter创建了一个登录和注册应用程序，其中显示了两个按钮（登录或注册）， 在点击注册没有任何反应。调试控制台还显示viewpostime指针0或1。我是android开发的初学者，任何帮助将不胜感激。谢谢。

    import 'package:flutter/material.dart';
    import 'package:firebase_auth/firebase_auth.dart';


    class LoginPage extends StatefulWidget {
    @override
    State<StatefulWidget> createState() => new _LoginPageState();
    }

    enum FormType {
    login,
    register
    }

    class _LoginPageState extends State<LoginPage> {
    final formKey = new GlobalKey<FormState>();
    String _email;
    String _password;
    FormType _formType = FormType.login;

    bool validateAndSave() {
    final form = formKey.currentState;
    if (form.validate()){
     form.save();
     return true;
    } return false;

    }

    void validateAndSubmit() async {
    if (validateAndSave()){
      try{
        if (_formType == FormType.login){
        AuthResult user = await FirebaseAuth.instance.signInWithEmailAndPassword(email: _email, 
        password: _password);
        print('Signed in : ${user.user.uid}');} 
        else{
          AuthResult user = await FirebaseAuth.instance.createUserWithEmailAndPassword(email: _email,  
          password: _password);
          print('Registered User: ${user.user.uid}');
        }
       } catch (e){ print('Error: $e');}
      }
     }

    void moveToRegister () {
    formKey.currentState.reset();
    setState(() {
    _formType = FormType.register;
    });
    }

    void moveToLogin(){
      setState(() {
    _formType = FormType.login;
     });
    }

    @override
    Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text('Flutter login demo'),
        ),
        body: new Container(
            padding: EdgeInsets.all(16.0),
            child: Form(
                key: formKey,
                child: Column(
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: buildInputs() + buildSubmitButtons() ))));
     } 

    List<Widget> buildInputs(){
    return [
       new TextFormField(
                      decoration: new InputDecoration(labelText: 'Email'),
                      validator: (value) => value.isEmpty ? 'Email can\'t be empty' : null,
                      onSaved: (value) => _email=value),
       new TextFormField(
                    decoration: new InputDecoration(labelText: 'Password'),
                    obscureText: true,
                    validator: (value) => value.isEmpty ? 'Password can\'t be empty' : null,
                     onSaved: (value) => _password=value,
                  ),

     ];
     }

     List<Widget> buildSubmitButtons(){
     if (_formType == FormType.login){
     return [
      new RaisedButton(
                    child:
                        new Text('Login', style: new TextStyle(fontSize: 20.0)),
                    onPressed: validateAndSave,),

      new FlatButton(
                    child: new Text('Create an Account', style: TextStyle(fontSize: 20.0)),
                    onPressed: moveToRegister,
                  )];

    }else{
      return [
      new RaisedButton(
                    child:
                        new Text('Create an Account', style: new TextStyle(fontSize: 20.0)),
                    onPressed: validateAndSave,),

      new FlatButton(
                    child: new Text('Have an Account? Login', style: TextStyle(fontSize: 20.0)),
                    onPressed: moveToLogin,
                  )

      ];
     }

      }}

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