I tried to make Dialog function on my app.
But the "No MaterialLocalizations found." error came out and it didn't open the popup window.
I don't know how to solve this issue even though I tried to find other references.
Please let me know how to fix this issue.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() {
runApp(OverApp());
}
class OverApp extends StatefulWidget {
#override
_OverAppState createState() => _OverAppState();
}
class _OverAppState extends State<OverApp> {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('List'),
),
body: RaisedButton(
child: Text('Show Material Dialog'),
onPressed: _showMaterialDialog,
),
),
);
}
_showMaterialDialog() {
showDialog(
context: context,
builder: (_) => new AlertDialog(
title: new Text("Material Dialog"),
content: new Text("Hey!"),
actions: <Widget>[
FlatButton(
child: Text('Close me!'),
onPressed: () {
Navigator.of(context).pop();
},
)
],
));
}
}
You need to put the MaterialApp in runApp (or make another widget and put the Scaffold in its build and use this new widget as the home of the MaterialApp).
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(home: OverApp()));
}
class OverApp extends StatefulWidget {
#override
_OverAppState createState() => _OverAppState();
}
class _OverAppState extends State<OverApp> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('List'),
),
body: RaisedButton(
child: Text('Show Material Dialog'),
onPressed: _showMaterialDialog,
),
);
}
_showMaterialDialog() {
showDialog(
context: context,
builder: (_) => new AlertDialog(
title: new Text("Material Dialog"),
content: new Text("Hey!"),
actions: <Widget>[
FlatButton(
child: Text('Close me!'),
onPressed: () {
Navigator.of(context).pop();
},
)
],
));
}
}
Related
I was just put official Doc code for see how Navigation work in web(chrome). But when I click button I get an error->
Navigator operation requested with a context that does not include a Navigator.
code->
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('First Route'),
),
body: Center(
child: ElevatedButton(
child: Text('Open route'),
// Within the `FirstRoute` widget
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),
);
}),
),
),
);
}
}
class SecondRoute extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Route"),
),
body: Center(
child: ElevatedButton(
// Within the SecondRoute widget
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
Thanks...
How to use MaterialPageRoute with a new file dart?
My codes:
main.dart
import 'package:flutter/material.dart';
import 'package:hello_world/settings_page.dart';
void main() => runApp(Belajar());
class Belajar extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
leading: Icon(Icons.android),
title: Text('Hello World'),
actions: [
IconButton(
icon: Icon(Icons.settings),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return SettingsPage();
},
),
);
},
)
],
),
),
);
}
}
settings_page.dart
import 'package:flutter/material.dart';
class SettingsPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
Navigator.pop(context);
},
),
),
);
}
}
I tried the code above. But, give me an error:
Navigator operation requested with a context that does not include a Navigator.
What wrong with my code?
you are missing just one thing
MaterialApp(
home:Builder(
//use this context to push new route
builder:(context){
return Scaffold(
appBar://..
);
}
)
)
here builder will introduce a new context which will contain the navigator introduced by material app
First create a class for example runFunction()
and you can use these code for going to that screen
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => runFunction(),
),
);
an example of runFuction
class _recipeSearchState extends State<recipeSearch> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('hello'),
),
body: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: [
Text("Text"),
],
),
),
);
}
}
Functionality behind the app:
The soccer ball in the upper right corner is a IconButton.
Once the soccer IconButton is clicked, it creates a modal pop up in the middle of the screen and the outside of the modal box is blurred.
The alert box shows heading "Success!" and then the content "You are in the football universe!".
I have included an image example of how it would look like once the the code is successful.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Welcome to Flutter',
home: Scaffold(
appBar: AppBar(
backgroundColor: Colors.deepPurple[200],
actions: <Widget>[
IconButton(
icon: Icon(
MdiIcons.soccer,
color: Colors.grey[800],
),
iconSize: 30,
onPressed: () => {
CupertinoAlertDialog(
title: Text('Success!'),
content: Text('You are in the football universe!'),
),
},
),
],
),
body: Center(
child: Text('Hello World'),
),
),
);
}
}
Issues:
There is no error being displayed.
The functionality for the modal being popped up is not being excuted.
Things I have tried that were unsuccessful:
I have tried to make another stateless widget and then included the name of that stateless widget inside appBar.
You can copy paste run full code below
Step 1: You can use showDialog
Step 2: Move MaterialApp to upper level void main() => runApp(MaterialApp(title: 'Welcome to Flutter', home: MyApp()));
code snippet
Future<void> _handleClickMe() async {
return showDialog<void>(
context: context,
barrierDismissible: false, // user must tap button!
builder: (BuildContext context) {
return CupertinoAlertDialog(
title: Text('Success!'),
content: Text('You are in the football universe!'),
);
},
);
}
working demo
full code
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
void main() => runApp(MaterialApp(title: 'Welcome to Flutter', home: MyApp()));
class MyApp extends StatefulWidget {
#override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
Future<void> _handleClickMe() async {
return showDialog<void>(
context: context,
barrierDismissible: false, // user must tap button!
builder: (BuildContext context) {
return CupertinoAlertDialog(
title: Text('Success!'),
content: Text('You are in the football universe!'),
);
},
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.deepPurple[200],
actions: <Widget>[
IconButton(
icon: Icon(
MdiIcons.soccer,
color: Colors.grey[800],
),
iconSize: 30,
onPressed: () => _handleClickMe(),
),
],
),
body: Center(
child: Text('Hello World'),
),
);
}
}
Looks like you need to call showDialog and pass your CupertinoAlertDialog to the builder
onPressed: () => {
showDialog(
context: context,
builder: (BuildContext context) => CupertinoAlertDialog(
title: Text('Success!'),
content: Text('You are in the football universe!')
),
),
},
Can someone explain why not printing efeioi when it is back from pageE?
Page A
Navigator.pushNamed(context, PageB.ROUTE).then((onValue) {
print("efeioi");
});
Page B
Navigator.of(context)
.pushReplacementNamed(PageC.ROUTE, arguments: onValue);
PageC
Navigator.pushNamed(context, PageD.ROUTE,
arguments: onValue);
PageD
Navigator.pop(context); // back to Page C
Page C
Navigator.pushNamed(context, PageE.ROUTE,
arguments: onValue);
Page E
Navigator.of(context).popUntil(ModalRoute.withName(PageA.ROUTE));
I can't use Navigator.pop in Page E because it will back to Page C!
I have uploaded full code here
https://github.com/tony123S/navigation
As per your requirement I have implemented as below
main.dart
initState : this will be called when you navigate from E to A
refreshPage : it will not called as you already popped before returning to A Page
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: A(),
routes: <String, WidgetBuilder>{
'/A': (BuildContext context) => new A(),
'/B': (BuildContext context) => new B(),
'/C': (BuildContext context) => new C(),
'/D': (BuildContext context) => new D(),
'/E': (BuildContext context) => new E(),
},
);
}
}
class A extends StatefulWidget {
#override
_FirstRouteState createState() => _FirstRouteState();
}
class _FirstRouteState extends State<A> {
final String fromPage;
_FirstRouteState({Key key, #required this.fromPage});
#override
void initState() {
// TODO: implement initState
super.initState();
print("Called askdfjaksdfj");
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Page A'),
),
body: Center(
child: RaisedButton(
child: Text('Open B'),
onPressed: () {
// Navigate to second route when tapped.
// Navigator.push(
// context,
// MaterialPageRoute(builder: (context) => B()),
// );
Navigator.push(
context,
MaterialPageRoute(builder: (context) => B()),
).then((res) => refreshPage());
},
),
),
);
}
refreshPage() {
print("refresh page is called");
}
}
class B extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("B Page"),
),
body: Center(
child: RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.of(context).pushNamed(
"/C",
);
},
child: Text('Go to C'),
),
),
);
}
}
class C extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("C Page"),
),
body: Center(
child: Column(
children: <Widget>[
RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.pushNamed(
context,
"/D",
);
},
child: Text('Go to D'),
),
RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.pushNamed(
context,
"/E",
);
},
child: Text('Go to E'),
),
],
),
),
);
}
}
class D extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("D Page"),
),
body: Center(
child: RaisedButton(
onPressed: () {
// Navigate back to first route when tapped.
Navigator.pop(context);
},
child: Text('Go back to C'),
),
),
);
}
}
class E extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("E Page"),
),
body: Center(
child: RaisedButton(
onPressed: () {
// Navigator.pop(context);
// Navigator.of(context).pushNamed("/A");
// Navigator.of(context).popUntil(ModalRoute.withName('/A'));
Navigator.of(context)
.pushNamedAndRemoveUntil('/A', (Route<dynamic> route) => false,);
},
child: Text('Go to A'),
),
),
);
}
}
Please run code for better understanding and reply if you found any difficulty
I am trying to show an Alert Dialog on press of a button in Flutter.
Following is my code
main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return MyAppState();
}
}
class MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: "Different Widgets",
debugShowCheckedModeBanner: false,
home: showAlertDialog()
);
}
void _dialogResult(String value) {
if (value == "YES") {
print("YES");
} else {
print("NO");
}
Navigator.pop(context);
}
Widget showAlertDialog() {
TextEditingController textEditingController = TextEditingController();
return Scaffold(
appBar: AppBar(
title: Text("Different Widgets"),
),
body: Container(
child: Center(
child: Column(
children: <Widget>[
TextField(
controller: textEditingController,
),
RaisedButton(
onPressed: () {
print("Hi");
AlertDialog dialog = AlertDialog(
title: Text("Hi"),
content: Text(
textEditingController.text,
style: TextStyle(fontSize: 30.0),
),
actions: <Widget>[
FlatButton(
onPressed: () {
_dialogResult("YES");
},
child: Text("YES")),
FlatButton(
onPressed: () {
_dialogResult("NO");
},
child: Text("NO")),
],
);
showDialog(context: context, builder: (BuildContext context) => dialog);
},
child: Text("Click Me"),
)
],
),
),
),
);
}
What does this has to do with Localisation, I cannot follow. I did the same steps as per the docs. I am able to see the button but on click of that button I keep getting error. I tried writing print statement inside of button click and the print statement appears in the log, definitely something wrong with AlertDialog.
You may get No MaterialLocalizations found error while showing dialog using showDialog() class in Flutter. The issue is putting child widget on home property of MaterialApp() widget without creating new widget class.
One way to solve is putting MaterialApp() inside runApp() and create new class for home property.
import 'package:flutter/material.dart';
main() {
runApp(
MaterialApp(
home: MyApp(),
title: "Different Widgets",
debugShowCheckedModeBanner: false,
),
);
}
/*
place MaterialApp() widget on runApp() and create
new class for its 'home' property
to escape 'No MaterialLocalizations found' error
*/
class MyApp extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return MyAppState();
}
}
class MyAppState extends State<MyApp> {
#override
Widget build(BuildContext context) {
return showAlertDialog();
}
void _dialogResult(String value) {
if (value == "YES") {
print("YES");
} else {
print("NO");
}
Navigator.pop(context);
}
Widget showAlertDialog() {
TextEditingController textEditingController = TextEditingController();
return Scaffold(
appBar: AppBar(
title: Text("Different Widgets"),
),
body: Container(
child: Center(
child: Column(
children: <Widget>[
TextField(
controller: textEditingController,
),
RaisedButton(
onPressed: () {
print("Hi");
AlertDialog dialog = AlertDialog(
title: Text("Hi"),
content: Text(
textEditingController.text,
style: TextStyle(fontSize: 30.0),
),
actions: <Widget>[
FlatButton(
onPressed: () {
_dialogResult("YES");
},
child: Text("YES")),
FlatButton(
onPressed: () {
_dialogResult("NO");
},
child: Text("NO")),
],
);
showDialog(
context: context,
builder: (BuildContext context) => dialog);
},
child: Text("Click Me"),
)
],
),
),
),
);
}
}