在颤动中路由到另一个屏幕时，未为类仪表板定义方法 RegisterCustomer

如何解决在颤动中路由到另一个屏幕时，未为类仪表板定义方法 RegisterCustomer

我在 lib 目录中有仪表板屏幕。 register_customer.dart 文件位于 lib 文件夹中的 customers 子目录下。我在仪表板屏幕中导入了 register_customer.dart。但是，register_customer.dart 中的 RegisterCustomer 类没有解析。这是我的代码：

lib/dashboard.dart

import 'package:Flutter/material.dart';
import './customers/register_customer.dart';

class MyDashboard extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            backgroundColor: defaultBackgroundColor,elevation: 0,leading: IconButton(
              icon: Icon(
                Icons.arrow_back,color: btnTextColor,),onpressed: () {
                //navigate to the prevIoUs page
                Navigator.pop(context);
              },//navabar title text text
            title: Text('Dashboard'),body: Center(
              child: Column(
            children: <Widget>[
              Container(
                margin: const EdgeInsets.all(20.0),//color: Colors.Amber[600],width: 200.0,height: 250.0,child: ListView(
                  children: <Widget>[
                    GestureDetector(
                      child: ListTile(
                        title: Text(
                          'Register Customer',style:
                              TextStyle(fontSize: 20,color: Color(0xffE06C19)),leading: Icon(
                          Icons.user,color: Colors.Amber,onTap: () {
         **//this is where the error is being raised**
                        Navigator.push(
                            context,MaterialPageRoute(
                                builder: (context) => RegisterCustomer()));
                      },],))),);
  }
}
lib/customers/register_customer.dart
import 'package:Flutter/material.dart';
class RegisterCustomer extends StatefulWidget {
  @override
  _RegisterCustomerState createState() => _RegisterCustomerState();
}

String _first_name;
String _last_name;

class _RegisterCustomerState extends State<RegisterCustomer> {
final GlobalKey<FormState> _formkey = GlobalKey<FormState>();
 
  

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
          primaryColor: Colors.purple[800],accentColor: Colors.Amber,accentColorBrightness: Brightness.dark),home: Scaffold(
        appBar: AppBar(
          title: Text(
            'Register Customer',style: TextStyle(fontSize: 20),textAlign: TextAlign.center,body: Container(
          margin: EdgeInsets.all(12),child: Form(
            key: _formkey,child: Column(
              mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[                       
               
                       SizedBox(
                  height: 50,RaisedButton(
                  color: Color(0xff980CF0),textColor: Colors.white,splashColor: Colors.grey,padding: EdgeInsets.fromLTRB(10,10,10),child: Text(
                    'Register',style: TextStyle(
                      color: Colors.orangeAccent,fontSize: 17,onpressed: () {
                    if (!_formkey.currentState.validate()) {
                      return;
                    }
                    //submit data to the server
                   
                  },)
              ],);
  }
}

我在其他路线上遇到了同样的问题。我做错了什么？

解决方法

我认为导入路径不正确：

import 'package:projectname/customer/register_customer.dart

如果文件在 lib/customer/register_customer.dart