颤振吐司插件错误"No overlay widget found"

Question

E/flutter (12906): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: No Overlay widget found.
E/flutter (12906): Some widgets require an Overlay widget ancestor for correct operation.
E/flutter (12906): The most common way to add an Overlay to an application is to include a MaterialApp, CupertinoApp or Navigator widget in the runApp() call.
E/flutter (12906): The context from which that widget was searching for an overlay was:
E/flutter (12906):   MyApp
E/flutter (12906): #0      Overlay.of.<anonymous closure>
overlay.dart:384
E/flutter (12906): #1      Overlay.of
overlay.dart:387
E/flutter (12906): #2      ToastView.createView
toast.dart:97
E/flutter (12906): #3      Toast.show
toast.dart:68

My Main dart

import 'package:flutter/material.dart';
import 'package:minwentaryzacja/screens/loginForm.dart';
import 'package:minwentaryzacja/screens/signupForm.dart';
import 'package:toast/toast.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
ToastContext().init(context);
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'm-Inwentaryzacja',
theme: ThemeData(
primarySwatch: Colors.blue,
primaryColor: Colors.white,
accentColor: Colors.black,
backgroundColor: Color.fromARGB(255, 0, 36, 66),
buttonTheme: ButtonThemeData(
buttonColor: Color.fromARGB(255, 190, 2, 58),
),
),
home: const LoginForm(title: 'm-Inwentaryzacja'),
routes: {
SignUpForm.routeName: (ctx) => SignUpForm(),
},
);
}
}

我toastHelper.dart

import 'package:flutter/material.dart';
import 'package:toast/toast.dart';
alertDialog(BuildContext context, String msg) {
Toast.show(msg, duration: Toast.lengthLong, gravity: Toast.bottom);
}

我loginForm.dart

import 'package:flutter/material.dart';
import 'package:flutter/src/widgets/framework.dart';
import 'package:flutter/src/widgets/placeholder.dart';
import 'package:minwentaryzacja/common/textFormField.dart';
import 'package:minwentaryzacja/common/toastHelper.dart';
import 'package:minwentaryzacja/databaseHandler/dbHelper.dart';
import 'package:minwentaryzacja/screens/signupForm.dart';
class LoginForm extends StatefulWidget {
const LoginForm({super.key, required this.title});
// static const routeName = '/loginPange';
final String title;
@override
State<LoginForm> createState() => _LoginFormState();
}
class _LoginFormState extends State<LoginForm> {
bool _obscureText = true;
final _formKey = new GlobalKey<FormState>();
final _conUserId = TextEditingController();
final _conPassword = TextEditingController();
var dbHelper;
@override
void initState() {
super.initState();
dbHelper = DbHelper();
}
void login() {
final form = _formKey.currentState;
String uid = _conUserId.text;
String password = _conPassword.text;
// String passwordR = _conPasswordR.text;
if (uid.isEmpty) {
alertDialog(context, "Wpisz nazwę Użytkownika");
} else if (password.isEmpty) {
alertDialog(context, "Podaj Hasło");
}
}
void _toggle() {
setState(() {
_obscureText = !_obscureText;
});
}
@override
Widget build(BuildContext context) {
return Container(
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage("assets/images/background.png"),
fit: BoxFit.cover)),
child: Scaffold(
backgroundColor: Colors.transparent,
// appBar: AppBar(
//   title: Text(widget.title),
// ),
body: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Container(
width: double.infinity,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
SizedBox(
height: 30.0,
),
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
// Expanded(
//     child: SizedBox(
//   width: 10.0,
// )),
Padding(
padding: EdgeInsets.only(left: 20, top: 20),
child: Image.asset(
"assets/images/logo.png",
width: 100,
),
),
Expanded(
child: SizedBox(
width: 10.0,
)),
],
),
SizedBox(
height: 80.0,
),
Text(
"Inwentaryzacja",
style: TextStyle(
fontWeight: FontWeight.bold,
color: Theme.of(context).primaryColor,
fontSize: 45),
),
SizedBox(
height: 70.0,
),
Text(
"Logowanie",
style: TextStyle(
fontWeight: FontWeight.normal,
color: Theme.of(context).primaryColor,
fontSize: 25.0),
),
SizedBox(
height: 10,
),
getTextFormField(
controller: _conUserId,
hintName: "Użytkownik",
icon: Icons.person,
),
SizedBox(
height: 10,
),
// getTextFormField(
//   controller: _conUserId,
//   hintName: "Hasło",
//   icon: Icons.person,
//   isobscureText: true,
// ),
Container(
margin: EdgeInsets.only(left: 50, right: 50),
child: TextFormField(
obscureText: _obscureText,
decoration: InputDecoration(
border: InputBorder.none,
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20)),
borderSide: BorderSide(color: Colors.transparent)),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20)),
),
prefixIcon: Icon(Icons.lock),
suffixIcon: IconButton(
onPressed: _toggle,
icon: Icon(_obscureText
? Icons.visibility
: Icons.visibility_off),
),
hintText: "Hasło",
fillColor: Colors.grey[200],
filled: true),
),
),
Container(
width: double.infinity,
margin: EdgeInsets.only(top: 30, left: 50, right: 50),
child: TextButton(
child: Text(
"Zaloguj",
style:
TextStyle(color: Theme.of(context).primaryColor),
),
onPressed: login,
style: TextButton.styleFrom(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(12),
),
foregroundColor: Theme.of(context).primaryColor,
padding: const EdgeInsets.all(20.0),
backgroundColor:
// Theme.of(context).colorScheme.primary,
Theme.of(context).backgroundColor,
))),
Container(
width: double.infinity,
margin: EdgeInsets.only(top: 10, left: 50, right: 50),
child: TextButton(
child: Text(
"Przejdź do rejestracji",
style: TextStyle(color: Theme.of(context).primaryColor),
),
onPressed: () {
Navigator.of(context).pushNamed(SignUpForm.routeName);
},
)),
],
),
),
),
),
);
}
}

我textFormField.dart

import 'package:flutter/material.dart';
import 'package:flutter/src/widgets/framework.dart';
import 'package:flutter/src/widgets/placeholder.dart';
import 'package:minwentaryzacja/common/toastHelper.dart';
class getTextFormField extends StatelessWidget {
TextEditingController controller;
String hintName;
IconData icon;
bool isobscureText;
getTextFormField(
{required this.controller,
required this.hintName,
required this.icon,
this.isobscureText = false});
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.only(top: 10, left: 50, right: 50),
child: TextFormField(
controller: this.controller,
obscureText: isobscureText,
validator: (value) {
if (value == null || value.isEmpty) {
return "Wprowadź $hintName";
}
if (hintName == "Hasło" && value.length < 6) {
return 'Hasło musi zawierać wiecej niż 6 znakoów';
}
return null;
},
// validator: (val) => (val == null) ? "Proszę wprowadź $hintName" : null,
// onSaved: (val) => controller.text = val!,
decoration: InputDecoration(
errorStyle:
TextStyle(color: Colors.black, fontWeight: FontWeight.bold),
border: InputBorder.none,
enabledBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20)),
borderSide: BorderSide(color: Colors.transparent)),
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(20)),
),
prefixIcon: Icon(icon),
hintText: hintName,
// labelText: hintName,
labelStyle: TextStyle(color: Theme.of(context).accentColor),
fillColor: Colors.grey[200],
filled: true),
),
);
}
}

我在显示我的助手时遇到了问题。我得到一个错误，我不知道如何修复。依赖关系:颤振:sdk:颤振path_provider: ^ 2.0.142.2.6 sqflite: ^。面包:^ 0.2.9

当我的输入(uid.isEmpty)我有错误，当我点击登录"alertDialog(context， "Podaj Hasło");"不工作。没有提示窗口

Answer 1

您的Main.dart应该是这样的:

import 'package:flutter/material.dart';
import 'package:minwentaryzacja/screens/loginForm.dart';
import 'package:minwentaryzacja/screens/signupForm.dart';
import 'package:toast/toast.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
ToastContext().init(context);
return OverlaySupport.global(
child: MaterialApp(
debugShowCheckedModeBanner: false,
title: 'm-Inwentaryzacja',
theme: ThemeData(
primarySwatch: Colors.blue,
primaryColor: Colors.white,
accentColor: Colors.black,
backgroundColor: Color.fromARGB(255, 0, 36, 66),
buttonTheme: ButtonThemeData(
buttonColor: Color.fromARGB(255, 190, 2, 58),
),
),
home: const LoginForm(title: 'm-Inwentaryzacja'),
routes: {
SignUpForm.routeName: (ctx) => SignUpForm(),
},
),
);
}
}