Currently, I have write codes for making up the counter app with two buttons. 1 raised button to reset and one fab button for increment counter.
is it possible to add the countdown timer to implement on FAB button? When FAB button clicks 20-second countdown timer start.
Also, I have found below thread for the same type of function implement. But I don't where to put codes in my app to implement countdown work on FAB button.
How to make a countdown in flutter?
import 'package:flutter/material.dart';
import 'dart:ui';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Counter App',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Counter App'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
int _counter = 0;
AnimationController controller;
bool _isButtonDisabled;
Duration get duration => controller.duration * controller.value;
bool get expired => duration.inSeconds == 0;
#override
void initState() {
controller = AnimationController(
vsync: this,
duration: Duration(seconds: 20),
);
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'number $_counter added',
),
AnimatedBuilder(
animation: controller,
builder: (BuildContext context, Widget child) {
return new Text(
'${duration.inSeconds}',
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: 50.0,
),
);
}),
new Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new RaisedButton(
padding: const EdgeInsets.all(15.0),
textColor: Colors.white,
color: Colors.redAccent,
onPressed: () {
setState(() {
controller.reset();
_counter = 0;
});
},
child: new Text("Reset"),
),
new RaisedButton(
onPressed: () => setState(() {
controller.reverse(from: 1);
}),
textColor: Colors.white,
color: Colors.purple,
padding: const EdgeInsets.all(15.0),
child: new Text(
"Start",
),
),
],
),
],
),
),
bottomNavigationBar: BottomAppBar(
child: Container(
height: 50.0,
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => setState(() {
_counter++;
}),
tooltip: 'Increment Counter',
child: Icon(Icons.add),
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
);
}
}
you can use anywhere this code.
Timer(Duration(seconds: 30), () {
//checkFirstSeen(); your logic
});
try the following:
import 'package:flutter/material.dart';
import 'dart:ui';
import 'dart:async';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Counter App',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Counter App'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
int _counter = 0;
AnimationController controller;
Duration get duration => controller.duration * controller.value;
bool get expired => duration.inSeconds == 0;
#override
void initState() {
controller = AnimationController(
vsync: this,
duration: Duration(seconds: 20),
);
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
AnimatedBuilder(
animation: controller,
builder: (BuildContext context, Widget child) {
return new Text(
'${duration.inSeconds}',
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: 50.0,
),
);
}),
new Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new RaisedButton(
padding: const EdgeInsets.all(15.0),
textColor: Colors.white,
color: Colors.redAccent,
onPressed: () {
setState(() {
controller.reset();
});
},
child: new Text("Reset"),
),
],
),
],
),
),
bottomNavigationBar: BottomAppBar(
child: Container(
height: 50.0,
),
),
floatingActionButton: FloatingActionButton(
onPressed: () => setState(() {
controller.reverse(from: 1);
}),
tooltip: 'Increment Counter',
child: Icon(Icons.add),
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
);
}
}
Related
I have an app with a page that has a ListView.builder().
Each row of the list is a stateful widget (match_chat_row.dart).
When you click on that stateful widget, it's navigating to another stateful widget (chat_screen.dart).
chat_screen.dart has a TextField.
The problem is that last few widgets(match_chat_row.dart) of the ListView are being disposed when the keyboard pops up on one of the first match_chat_row's chat_screen.dart.
I made this simple app to demonstrate it:
main.dart
import 'package:flutter/material.dart';
import 'match_chat_row.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: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final String _pageName = "Screen";
List<String> _chats = ["A","B","C","D","E","F","G","H","I","J"];
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: _body()
);
}
_body(){
return ListView.builder(
itemCount: _chats.length,
itemBuilder: (_, index) => _buildRow(_chats[index]),
);
}
Widget _buildRow(String chat) {
return
Column(
key: ValueKey<String>('chat-$chat'),
children: [
Center(
child:
MatchChatRow(
content: chat,
),
),
Divider(color: Colors.grey.withOpacity(0.20), thickness: 0.8, height: 0.0,)
],
);
}
}
match_chat_row.dart
import 'package:flutter/material.dart';
import 'chat_screen.dart';
class MatchChatRow extends StatefulWidget {
final String content;
const MatchChatRow({required this.content});
#override
_MatchChatRowState createState() => _MatchChatRowState();
}
class _MatchChatRowState extends State<MatchChatRow> {
#override
void dispose(){
print("Disposed ROW! ${widget.content}");
super.dispose();
}
#override
Widget build(BuildContext context) {
final rowHeight = 100.0;
final rowPadding = 10.0;
return
InkWell(
onTap: () =>
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ChatScreen(
key: ValueKey(widget.content),
),
),
),
child:
Container(
height: rowHeight,
padding: EdgeInsets.all(rowPadding),
child: Row(
children: <Widget>[
SizedBox(
width: 20.0,
),
Expanded(
child:
Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(widget.content),
Text("_buildSubtitle()"),
],
)
),
],
),
)
);
}
}
chat_screen.dart
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class ChatScreen extends StatefulWidget {
const ChatScreen({required Key key,}): super(key: key);
#override
_ChatScreenState createState() => _ChatScreenState();
}
class _ChatScreenState extends State<ChatScreen> with TickerProviderStateMixin {
final TextEditingController _messageController = TextEditingController();
bool _isComposingMessage = false;
bool _isChatExist = false;
bool _isLoading = false;
bool _isSending = false;
#override
void initState() {
super.initState();
}
#override
void dispose(){
print("disposed chat! ${widget.key}");
super.dispose();
}
Container _buildMessageTF() {
return Container(
margin: const EdgeInsets.only(left: 8, right: 8, bottom: 8),
decoration: BoxDecoration(
border:
Border.all(color: Theme.of(context).accentColor.withOpacity(0.3)),
borderRadius: BorderRadius.circular(30)),
child: Row(
children: <Widget>[
Expanded(
child:
TextField(
minLines: 1,
maxLines: 4,
controller: _messageController,
textCapitalization: TextCapitalization.sentences,
onChanged: (messageText) {
setState(() => _isComposingMessage = messageText.isNotEmpty);
},
decoration: InputDecoration(
focusedBorder: InputBorder.none,
enabledBorder: InputBorder.none,
hintText: 'Message...'),
),
),
],
),
);
}
#override
Widget build(BuildContext context) {
return
WillPopScope(
onWillPop: () {
return Future.value(true);
},
child:
SafeArea(
child: Scaffold(
appBar: AppBar(
title: Text("Hi")
),
body:
SafeArea(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
if (!_isChatExist && !_isLoading) SizedBox.shrink(),
_buildMessageTF(),
],
),
),
),
)
);
}
}
And whenever I click on the TextField and the Keyboard pops up the below widgets are being disposed (this is my debug console):
I/flutter (23372): Disposed ROW! I
I/flutter (23372): Disposed ROW! J
I/flutter (23372): Disposed ROW! H
update your _body from main
_body(){
return SingleChildScrollView(
child: ListView.builder(
shrinkWrap: true,
physics: ScrollPhysics(),
itemCount: _chats.length,
itemBuilder: (_, index) => _buildRow(_chats[index]),
),
);
}
I wanted to show dialog in my application. How can i achieve this using flutter
You can use a PopupMenuButton (https://api.flutter.dev/flutter/material/PopupMenuButton-class.html) to achieve this in flutter.
See example code below:
PopupMenuButton<int>(
itemBuilder: (context) => [
const PopupMenuItem(
value: 1,
child: Center(
child: Icon(
Icons.download_outlined,
size: 30.0,
),
),
),
const PopupMenuItem(
value: 2,
child: Center(
child: Icon(
Icons.link,
size: 30.0,
),
),
),
const PopupMenuItem(
value: 2,
child: Center(
child: Icon(
Icons.share,
size: 30.0,
),
),
),
],
icon: const Icon(
Icons.more_horiz,
size: 40.0,
),
offset: const Offset(150, -150),
);
The above example popups a list of Icons when the PopupMenuButton is pressed.
You can adapt this to your use-case above.
Finally I found a Solution thanks enfinity. Here how i solve the problem.
import 'package:flutter/material.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
home: new MyHomePage(),
);
}
}
/// An arbitrary widget that lives in a popup menu
class PopupMenuWidget<T> extends PopupMenuEntry<T> {
const PopupMenuWidget({ Key key, this.height, this.child }) : super(key: key);
#override
final Widget child;
#override
final double height;
#override
bool get enabled => false;
#override
_PopupMenuWidgetState createState() => new _PopupMenuWidgetState();
}
class _PopupMenuWidgetState extends State<PopupMenuWidget> {
#override
Widget build(BuildContext context) => widget.child;
}
class MyHomePage extends StatelessWidget {
MyHomePage({Key key}) : super(key: key);
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
actions: <Widget>[
new PopupMenuButton<String>(
onSelected: (String value) {
print("You selected $value");
},
itemBuilder: (BuildContext context) {
return [
new PopupMenuWidget(
height: 40.0,
child: new Row(
children: [
IconButton(
icon: Icon(
Icons.remove,
color: Colors.green,
),
onPressed: () {
print("Remove");
}),
Text("1"),
IconButton(
icon: Icon(
Icons.add,
color: Colors.green,
),
onPressed: () {
print("Add");
}),
],
),
),
];
}
),
],
),
);
}
}
I am new to Flutter and I am creating a notes app. i want to pass the title and text of the new note from a "new note" page to the home page where all other notes are.
I want to pass the title and text to the first page where I can create a list of saved notes as the number of notes grow using a List view. What am I doing wrong?
Here is my code for the home page:
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:notes/newnote.dart';
void main() {
runApp(MaterialApp(home: MyApp(), initialRoute: 'main.dart', routes: {
'/home': (context) => MyApp(),
'/newnote': (context) => NewNote(),
}));
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Notes',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: FirstPage(),
);
}
}
int x = 0;
class FirstPage extends StatefulWidget {
String title ;
String text ;
FirstPage({Key key, #required this.title,#required this.text}) : super(key: key);
void pri() {print(title);}
#override
_MyAppState createState() => _MyAppState();
}
Map data = {};
class _MyAppState extends State<FirstPage> {
#override
Widget build(BuildContext context) {
//final dat args = ModalRoute.of(context).settings.arguments;
return Scaffold(
appBar: AppBar(
title: Text(
"Note-It!",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.black,
),
body: Column(
//
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 19.0),
),
Expanded(
child: ListView.builder(
itemCount: x,
itemBuilder: (context, index) {
return ListTile(
title: Text(widget.title),
// onTap: () {
// Navigator.push( context,MaterialPageRoute( builder: (context) =>
// DetailScreen(notedata: datas[index])));
// }
);
}),
),
Align(
alignment: Alignment.bottomRight,
child: FloatingActionButton(
child: Icon(Icons.add),
backgroundColor: Colors.black,
onPressed: () {
setState(() {
Navigator.push(context, new MaterialPageRoute(
builder: (context) =>
new NewNote(t1: null, t2: null)
));
});
}),
),
],
),
);
}
}
and here is my code for "new note" page
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:notes/main.dart';
void main() {
runApp(MaterialApp(home: NewNote()));
}
final fromController1 = TextEditingController();
final fromController2 = TextEditingController();
var instance;
class NewNote extends StatelessWidget {
String t1; //requesting data here
String t2;
NewNote({Key key, #required this.t1,#required this.t2}) : super(key: key);
// final String d;
//
// NewNote({
// Key key,
// #required this.d,
// }) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("New Note"),
backgroundColor: Colors.black,
),
body: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 19.0),
child: SingleChildScrollView(
child: Column(children: <Widget>[
TextField(
controller: fromController1,
decoration: InputDecoration(
border: OutlineInputBorder(), labelText: "Title"),
style: TextStyle(fontSize: 28.0),
),
Padding(padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 0.0)),
TextField(
controller: fromController2,
decoration: InputDecoration(
border: OutlineInputBorder(), labelText: "Text"),
style: TextStyle(fontSize: 20.0),
maxLines: null,
),
Padding(padding: EdgeInsets.fromLTRB(19.0, 19.0, 19.0, 0.0)),
Align(
alignment: Alignment.bottomCenter,
child: FloatingActionButton.extended(
label: Text("Save Note"),
icon: Icon(Icons.save),
backgroundColor: Colors.black,
onPressed: () {
x++;
t1 = fromController1.text;
t2 = fromController2.text;
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => MyApp(), //pass your title and text to NewNote
),
).then((value){
FirstPage(title: t1, text: t2);
});
},
),
),
]),
),
),
),
);
}
}
You have already passed the title and string in the first page from new note page. You are just not displaying it onto the screen with right syntax.
Change this
title: Text(
"Note-It!",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
to
title: Text(
this.widget.title,
textAlign: TextAlign.center,
style: TextStyle(color: Colors.white),
),
My App contains basically 2 parts -> Appbar (with 1 Button) and BottomNavigationBar (with some buttons that works properly). The problem came when I pressed the Appbar button (goes to a black screen instead of show the "manual_page.dart")
this is the content of the 2 files (the home_page.dart and manual_page.dart):
home_page.dart
import 'package:flutter/material.dart';
import 'package:opening_a_pdf/manual_page.dart';
import 'package:opening_a_pdf/first_page.dart';
import 'package:opening_a_pdf/second_page.dart';
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _selectedPage = 0;
List<Widget> pageList = List<Widget>();
#override
void initState() {
pageList.add(FirstPage());
pageList.add(SecondPage());
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Color(0xFFFAFAFA),
appBar: AppBar(
backgroundColor: Colors.black,
title: const Text('Aplicación en Desarrollo'),
actions: <Widget>[
FlatButton(
textColor: Colors.white,
child: Text(
'MANUAL',
style: TextStyle(
fontSize: 16.0,
fontWeight: FontWeight.bold,
),
),
onPressed: (){
Navigator.push(
context,
MaterialPageRoute(builder: (context) => Voice()),
);
}
)
],
),
body: IndexedStack(
index: _selectedPage,
children: pageList,
),
bottomNavigationBar: BottomNavigationBar(
// type: BottomNavigationBarType.fixed,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
backgroundColor: Colors.black,
icon: Icon(Icons.compare_arrows),
title: Text('Conectividad'),
),
BottomNavigationBarItem(
backgroundColor: Colors.black,
icon: Icon(Icons.blur_on),
title: Text('Captura Datos'),
),
BottomNavigationBarItem(
backgroundColor: Colors.black,
icon: Icon(Icons.graphic_eq),
title: Text('Voz'),
),
BottomNavigationBarItem(
backgroundColor: Colors.black,
icon: Icon(Icons.list),
title: Text('Comandos'),
),
BottomNavigationBarItem(
backgroundColor: Colors.black,
icon: Icon(Icons.settings),
title: Text('Ajustes'),
),
],
currentIndex: _selectedPage,
selectedItemColor: Colors.amber[800],
onTap: _onItemTapped,
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
void _onItemTapped(int index) {
setState(() {
_selectedPage = index;
});
}
}
manual_page.dart
import 'package:flutter/material.dart';
// ignore: camel_case_types
class Voice extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Sección de Órdenes por Voz"),
),
body: Stack(
fit: StackFit.expand,
children: <Widget>[
Positioned(
bottom: 0,
width: MediaQuery.of(context).size.width,
child: Center(
child: MaterialButton(
onPressed: () {},
color: Colors.red,
),
),
)
],
),
);
}
}
Try to initial the height of container in the second screen before Stack
There are no errors in the code. Works correctly. Maybe the fault is in the main () or in the emulator.
Code in main:
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
I executed your code and found no problem with it:
But you can put empty Container() as the child of MaterialButton().
Corrected code:
MaterialButton(
onPressed: () {},
color: Colors.red,
child:Container(),
),
I am trying to get a dropdownlist to navigate to another screen once one of the items in the list is pressed via the dropdownbutton. I have tried using Navigator.push straight into onChanged but that doesnt work. And i have tried creating a new button in set state in onChanged. How can I do this because I do not know how?
import 'package:flutter/material.dart';
void main() => runApp(new HomeNavigator());
class HomeNavigator extends StatefulWidget {
#override
_HomeNavigator createState() => _HomeNavigator();
}
class _HomeNavigator extends State<HomeNavigator> {
List<DropdownMenuItem<String>> listMunicipalities = [];
String selected = null;
void loadData() {
listMunicipalities = [];
listMunicipalities.add(new DropdownMenuItem(
child: new Text('Port Moody'),
value: 'Port Moody',
));
listMunicipalities.add(new DropdownMenuItem(
child: new Text('Vancouver Downtown'),
value: 'Vancouver Downtown',
));
listMunicipalities.add(new DropdownMenuItem(
child: new Text('Coquitlam'),
value: 'Coquitlam',
));
}
#override
Widget build(BuildContext context) {
loadData();
Color gradientStart = Colors.deepOrange[700];
Color gradientEnd = Colors.purple[500];
return new MaterialApp(
home: new Scaffold(
body: new Container(
decoration: new BoxDecoration(
gradient: new LinearGradient(
colors: [gradientEnd, gradientStart],
begin: new FractionalOffset(0.0, 0.5),
end: new FractionalOffset(0.5, 0.0),
stops: [0.0, 1.0]),
),
child: Stack(children: [
Container(
child: Text('',
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 30.0,
fontFamily: 'College-Block',
color: Colors.white.withOpacity(0.7))),
alignment: Alignment(0.0, -0.5)),
Padding(
padding: const EdgeInsets.all(8.0),
child: new Center(
child: new Container(
alignment: Alignment(0.0, 0.05),
child: Container(
width: 350.0,
child: DropdownButtonHideUnderline(
child: new DropdownButton(
value: selected,
items: listMunicipalities,
hint: Text(
'Select City',
textAlign: TextAlign.center,
style: TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white.withOpacity(0.5)),
),
onChanged: (value){
}),
)),
)))
]))));
}
}
class HomePage extends StatefulWidget{
#override
_HomePage createState() => _HomePage();
}
class _HomePage extends State<HomePage> {
Widget build(BuildContext context){
return Scaffold(
appBar: AppBar(
title: Text('')
),
);
}
}
you can just use simple switch case over there. refer below example to clear idea.
import 'package:flutter/material.dart';
void main() {
runApp(MaterialApp(
title: 'Navigation Basics',
home: FirstScreen(),
));
}
class FirstScreen extends StatelessWidget {
String _selectedGender=null;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('First Screen'),
),
body: Column(
children: <Widget>[
DropdownButton(
value: _selectedGender,
items: _dropDownItem(),
onChanged: (value){
_selectedGender=value;
switch(value){
case "Male" :
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondScreen()),
);
break;
case "Others" :
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondScreen()),
);
break;
case "Female" :
Navigator.push(
context,
MaterialPageRoute(builder: (context) => third()),
);
break;
}
},
hint: Text('Select Gender'),
),
],
),
);
}
List<DropdownMenuItem<String>> _dropDownItem() {
List<String> ddl = ["Male", "Female", "Others"];
return ddl.map(
(value) =>
DropdownMenuItem(
value: value,
child: Text(value),
)
).toList();
}
}
class SecondScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Second Screen"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
class third extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("tgird Screen"),
),
body: Center(
child: RaisedButton(
onPressed: () {
Navigator.pop(context);
},
child: Text('Go back!'),
),
),
);
}
}
for detail go to document https://flutter.io/cookbook/navigation/navigation-basics/
Add below line in your code for Navigation
onChanged: (value){
Navigator.push(context,MaterialPageRoute(builder: (context) =>
YourScreenInstance()),);
}
Navigator.popAndPushNamed(context, "/YourScreenInstance");
Navigator.of(context).pushNamed('/NewPage');