Develop Reference

How to make page transition when use bottomNavigationBar in flutter

I use a basic bottomNavigationBar and now it shows just page without any transition,i want to use page transition when tap different bottomNavigationBars item.

Use IndexedStack Widget
int _currentIndex = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: IndexedStack(
index: _currentIndex,
children: const [
HomePage(),
SettingsPage(),
],
),
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _currentIndex,
onTap: (int index) => setState(() => _currentIndex = index),
items: [
BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
BottomNavigationBarItem(icon: Icon(Icons.settings), label: 'Settings'),
],
),
);
}

use PageView or TabView
Check this article

List pages = [
HomeScreen(),
DiscoverScreen(),
Container(),
MessageScreen(),
ProfileScreen(),
];
Scaffold(
body: pages.elementAt(current!),
bottomNavigationBar: BottomNavigationBar(
currentIndex: widget.current!,
unselectedItemColor: Colors.black,
selectedItemColor: Colors.green,
showSelectedLabels: true,
showUnselectedLabels: true,
onTap: (val) {
setState(() {
current = val;
});

Bottom Nav Transition With Persisting Ui
import 'package:flutter/material.dart';
class BottomNavTransitionWithPersistingUi extends StatefulWidget {
const BottomNavTransitionWithPersistingUi({Key? key}) : super(key: key);
#override
State<BottomNavTransitionWithPersistingUi> createState() => _BottomNavTransitionWithPersistingUiState();
}
class _BottomNavTransitionWithPersistingUiState extends State<BottomNavTransitionWithPersistingUi> {
late PageController _pageController;
late List<Widget> _tabBody;
int _currentIndex = 0;
#override
void initState() {
super.initState();
_pageController = PageController(
initialPage: 0,
keepPage: true, // for ui state
);
_tabBody = [
const NavHomeView(key: PageStorageKey("NavHomeView")),
const NavMoreView(key: PageStorageKey("NavMoreView")),
];
}
#override
Widget build(BuildContext context) {
return Scaffold(
bottomNavigationBar: _bottomNavigationBarItems,
body: PageView(
controller: _pageController,
onPageChanged: _onPageChanged,
children: _tabBody,
),
);
}
Widget get _bottomNavigationBarItems => BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.home),
label: 'Home',
),
BottomNavigationBarItem(
icon: Icon(Icons.menu),
label: 'More',
),
],
currentIndex: _currentIndex,
selectedItemColor: Colors.red,
elevation: 0.1,
unselectedItemColor: Colors.grey,
enableFeedback: true,
onTap: _onNavBarTapped,
);
void _onNavBarTapped(int index) {
setState(() {
_currentIndex = index;
});
_pageController.animateToPage(
index,
duration: const Duration(milliseconds: 500),
curve: Curves.easeOut,
);
}
void _onPageChanged(int index) {
setState(() {
_currentIndex = index;
});
}
}
class NavHomeView extends StatelessWidget {
const NavHomeView({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return ListView(
children: [
Container(
height: 500,
color: Colors.purple,
),
Container(
height: 500,
color: Colors.blue,
),
Container(
height: 500,
color: Colors.grey,
),
],
);
}
}
class NavMoreView extends StatelessWidget {
const NavMoreView({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return ListView(
children: [
Container(
height: 500,
color: Colors.red,
),
Container(
height: 500,
color: Colors.green,
),
Container(
height: 500,
color: Colors.amber,
),
],
);
}
}

bottomNavigationBar are not displaying in the flutter

Hi I am trying to build an app in the flutter. I want to have bottom Navigation Bar in my screen. I am trying like below but it is not displaying bottom Navigation Bar .
When I have below code then it display the text correctly !!.
Does anyone know what is the reason of it ?
image after Run
class _TabsScreenState extends State<TabsScreen> {
void _selectScreen(int index) {
setState(() {
_selectedScreenIndex = index;
});
}
int _selectedScreenIndex = 0;
late List<Map<String, Object>> _screens;
#override
void initState() {
_screens = [
{
'Screen': CentersScreen(),
'Title': ' الصفحة الرئيسية',
},
{
'Screen': AdvertisementScreen(),
'Title': 'صفحة الإعلانات',
},
{
'Screen': ProfileScreen(),
'Title': ' الملف الشخصي ',
},
];
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(_screens[_selectedScreenIndex]['Title'].toString()),
backgroundColor: Colors.purple[300],
),
body: _screens[_selectedScreenIndex]['Screen']as Widget,
bottomNavigationBar: BottomNavigationBar(
onTap: _selectScreen,
backgroundColor: Colors.purple[300],
selectedItemColor: Theme.of(context).accentColor,
unselectedItemColor: Colors.white,
currentIndex: _selectedScreenIndex,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home_outlined),
label: 'الرئيسية',
),
BottomNavigationBarItem(
icon: Icon(Icons.campaign_rounded),
label: 'الاعلانات',
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
label: 'حسابي',
),
],
),
);
}
}

Try something like this:
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
int _indexNow = 0;
#override
Widget build(BuildContext context) {
List<Widget> _screens = [
screen1(),
screen2(),
screen3(),
];
return Scaffold(
appBar: AppBar(
title: Text("Some text"),
),
body: Container(
padding: EdgeInsets.all(10),
child: _screens[_indexNow],
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _indexNow,
type: BottomNavigationBarType.fixed,
fixedColor: Colors.black,
onTap: (indice) {
setState(() {
_indexNow = indice;
});
},
items: [
BottomNavigationBarItem(
icon: Icon(Icons.notifications),
label: "Text screen1",
),
BottomNavigationBarItem(
icon: Icon(Icons.book),
label: "Text screen2",
),
BottomNavigationBarItem(
icon: Icon(Icons.video_camera_back),
label: "Text screen3",
),
],
),
);
}
}
I hope to help you!

Flutter : Staying inside wrapper when navigating with AppBar

I have a bottom navigation bar, that lets me navigate between pages, while keeping the Bottom Navigation bar in place (Using Persistent Bottom Navigation bar package)
I also want to have a extra navigation button, that sends me to another page not listed on the Bottom Navigation bar, but all the different ways I have tried, it pushes me to another page, that is not inside the wrapper.
How could I navigate to another page from AppBar (Page is not listed on the bottom navigation bar) without losing the Navigation bar?
Attatching wrapper code
class Wrapper extends StatefulWidget {
final BuildContext menuScreenContext;
Wrapper({Key key, this.menuScreenContext}) : super(key: key);
#override
_WrapperState createState() => _WrapperState();
}
class _WrapperState extends State<Wrapper> {
final AuthService _auth = AuthService();
PersistentTabController _controller;
bool _hideNavBar;
#override
void initState() {
super.initState();
_controller = PersistentTabController(initialIndex: 0);
_hideNavBar = false;
}
List<Widget> _buildScreens() {
return [
HomePage(
hideStatus:_hideNavBar,
),
Page1(),
Page2(),
Page3(),
Page4(
hideStatus:_hideNavBar,
),
];
}
List<PersistentBottomNavBarItem> _navBarsItems() {
return [
PersistentBottomNavBarItem(
icon: Icon(Icons.home),
title: "Home",
activeColor: Colors.blue,
inactiveColor: Colors.grey,
),
PersistentBottomNavBarItem(
icon: Icon(Icons.search),
title: ("Search"),
activeColor: Colors.teal,
inactiveColor: Colors.grey,
),
PersistentBottomNavBarItem(
icon: Icon(Icons.add),
title: ("Add"),
activeColor: Colors.deepOrange,
inactiveColor: Colors.grey,
),
PersistentBottomNavBarItem(
icon: Icon(Icons.settings),
title: ("Settings"),
activeColor: Colors.indigo,
inactiveColor: Colors.grey,
),
PersistentBottomNavBarItem(
icon: Icon(Icons.settings),
title: ("Settings"),
activeColor: Colors.indigo,
inactiveColor: Colors.grey,
),
];
}
#override
Widget build(BuildContext context)
{
final user = Provider.of<NUser>(context);
if(user==null){
return Authenticate();}
else {
return Scaffold
(
drawer: Drawer(
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>
[
TextButton
(child:Text('hey'), onPressed: ()
{
pushNewScreenWithRouteSettings(
context,
settings: RouteSettings(name:'/home'),
screen: HomePage());
}
),
ElevatedButton.icon(
onPressed: () async {await _auth.signOut();},
icon: Icon(Icons.person),
label: Text('Logout'),
),
],
),
),
),
appBar: AppBar(
actions: [
IconButton(iconSize: 150,icon: Image.asset("assets/BUTTON.png", color: Colors.black,height: 1000,width: 1000,), onPressed: ()
{
Navigator.push(context, MaterialPageRoute(builder: (context) => Profile()));
}),
ButtonTheme(
minWidth: 100.0,
height: 100.0,
child: TextButton(
onPressed: () {},
child: Text(" 4444 "),
),
),
],
),
body: PersistentTabView.custom
(
context,
controller: _controller,
screens: _buildScreens(),
confineInSafeArea: true,
itemCount: 5,
handleAndroidBackButtonPress: true,
resizeToAvoidBottomInset: false,
stateManagement: true,
hideNavigationBar: _hideNavBar,
screenTransitionAnimation: ScreenTransitionAnimation(
animateTabTransition: true,
curve: Curves.ease,
duration: Duration(milliseconds: 200),
),
customWidget: CustomNavBarWidget
(
items: _navBarsItems(),
onItemSelected: (index) {
setState(() {
_controller.index = index; // THIS IS CRITICAL!! Don't miss it!
});
},
selectedIndex: _controller.index,
),
),
);
}
}
}
class Profile extends StatefulWidget {
Profile({Key key}): super(key: key);
#override
_ProfileState createState() => _ProfileState();
}
class _ProfileState extends State<Profile> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title:Text('sample'),
),
);
}
}
I tried creating a class for the page in wrapper, but no luck. Other pages are individual files. I am trying to navigate with the AppBar Button

How to open this type of alert dialog in flutter

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");
}),
],
),
),
];
}
),
],
),
);
}
}

Black-Screen with the FlatButton in the AppBar

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(),
),