Flutter: BottomNavigationBar rebuilds Page on change of tab - flutter

I have a problem with my BottomNavigationBar in Flutter. I want to keep my page alive if I change the tabs.
here my implementation
BottomNavigation
class Home extends StatefulWidget {
#override
State<StatefulWidget> createState() {
return _HomeState();
}
}
class _HomeState extends State<Home> {
int _currentIndex = 0;
List<Widget> _children;
final Key keyOne = PageStorageKey("IndexTabWidget");
#override
void initState() {
_children = [
IndexTabWidget(key: keyOne),
PlaceholderWidget(Colors.green),
NewsListWidget(),
ShopsTabWidget(),
PlaceholderWidget(Colors.blue),
];
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(MyApp.appName),
textTheme: Theme.of(context).textTheme.apply(
bodyColor: Colors.black,
displayColor: Colors.blue,
),
),
body: _children[_currentIndex],
bottomNavigationBar: BottomNavigationBar(
onTap: onTabTapped,
key: IHGApp.globalKey,
fixedColor: Colors.green,
type: BottomNavigationBarType.fixed,
currentIndex: _currentIndex,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.home),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(Icons.message),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(Icons.settings),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(Icons.perm_contact_calendar),
title: Container(height: 0.0),
),
BottomNavigationBarItem(
icon: Icon(Icons.business),
title: Container(height: 0.0),
),
],
),
);
}
void onTabTapped(int index) {
setState(() {
_currentIndex = index;
});
}
Column buildButtonColumn(IconData icon) {
Color color = Theme.of(context).primaryColor;
return Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(icon, color: color),
],
);
}
}
This is my index page (first tab):
class IndexTabWidget extends StatefulWidget {
IndexTabWidget({Key key}) : super(key: key);
#override
State<StatefulWidget> createState() {
return new IndexTabState();
}
}
class IndexTabState extends State<IndexTabWidget>
with AutomaticKeepAliveClientMixin {
List<News> news = List();
FirestoreNewsRepo newsFirestore = FirestoreNewsRepo();
#override
Widget build(BuildContext context) {
return Material(
color: Colors.white,
child: new Container(
child: new SingleChildScrollView(
child: new ConstrainedBox(
constraints: new BoxConstraints(),
child: new Column(
children: <Widget>[
HeaderWidget(
CachedNetworkImageProvider(
'https://static1.fashionbeans.com/wp-content/uploads/2018/04/50-barbershop-top-savill.jpg',
),
"",
),
AboutUsWidget(),
Padding(
padding: const EdgeInsets.all(16.0),
child: SectionTitleWidget(title: StringStorage.salonsTitle),
),
StreamBuilder(
stream: newsFirestore.observeNews(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return CircularProgressIndicator();
} else {
news = snapshot.data;
return Column(
children: <Widget>[
ShopItemWidget(
AssetImage('assets/images/picture.png'),
news[0].title,
news[0],
),
ShopItemWidget(
AssetImage('assets/images/picture1.png'),
news[1].title,
news[1],
)
],
);
}
},
),
Padding(
padding: const EdgeInsets.only(
left: 16.0, right: 16.0, bottom: 16.0),
child: SectionTitleWidget(title: StringStorage.galleryTitle),
),
GalleryCategoryCarouselWidget(),
],
),
),
),
),
);
}
#override
bool get wantKeepAlive => true;
}
So if I switch from my index tab to any other tab and back to the index tab, the index tab will always rebuild. I debugged it and saw that the build function is always being called on the tab switch.
Could you guys help me out with this issue?
Thank you a lot
Albo

None of the previous answers worked out for me.
The solution to keep the pages alive when switching the tabs is wrapping your Pages in an IndexedStack.
class Tabbar extends StatefulWidget {
Tabbar({this.screens});
static const Tag = "Tabbar";
final List<Widget> screens;
#override
State<StatefulWidget> createState() {
return _TabbarState();
}
}
class _TabbarState extends State<Tabbar> {
int _currentIndex = 0;
Widget currentScreen;
#override
Widget build(BuildContext context) {
var _l10n = PackedLocalizations.of(context);
return Scaffold(
body: IndexedStack(
index: _currentIndex,
children: widget.screens,
),
bottomNavigationBar: BottomNavigationBar(
fixedColor: Colors.black,
type: BottomNavigationBarType.fixed,
onTap: onTabTapped,
currentIndex: _currentIndex,
items: [
BottomNavigationBarItem(
icon: new Icon(Icons.format_list_bulleted),
title: new Text(_l10n.tripsTitle),
),
BottomNavigationBarItem(
icon: new Icon(Icons.settings),
title: new Text(_l10n.settingsTitle),
)
],
),
);
}
void onTabTapped(int index) {
setState(() {
_currentIndex = index;
});
}
}

You need to wrap every root page (the first page you see when you press a bottom navigation item) with a navigator and put them in a Stack.
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
final int _pageCount = 2;
int _pageIndex = 0;
#override
Widget build(BuildContext context) {
return Scaffold(
body: _body(),
bottomNavigationBar: _bottomNavigationBar(),
);
}
Widget _body() {
return Stack(
children: List<Widget>.generate(_pageCount, (int index) {
return IgnorePointer(
ignoring: index != _pageIndex,
child: Opacity(
opacity: _pageIndex == index ? 1.0 : 0.0,
child: Navigator(
onGenerateRoute: (RouteSettings settings) {
return new MaterialPageRoute(
builder: (_) => _page(index),
settings: settings,
);
},
),
),
);
}),
);
}
Widget _page(int index) {
switch (index) {
case 0:
return Page1();
case 1:
return Page2();
}
throw "Invalid index $index";
}
BottomNavigationBar _bottomNavigationBar() {
final theme = Theme.of(context);
return new BottomNavigationBar(
fixedColor: theme.accentColor,
currentIndex: _pageIndex,
items: [
BottomNavigationBarItem(
icon: Icon(Icons.list),
title: Text("Page 1"),
),
BottomNavigationBarItem(
icon: Icon(Icons.account_circle),
title: Text("Page 2"),
),
],
onTap: (int index) {
setState(() {
_pageIndex = index;
});
},
);
}
}
The pages will be rebuild but you should separate your business logic from you UI anyway. I prefer to use the BLoC pattern but you can also use Redux, ScopedModel or InhertedWidget.

Just use an IndexedStack
IndexedStack(
index: selectedIndex,
children: <Widget> [
ProfileScreen(),
MapScreen(),
FriendsScreen()
],
)

I'm not sure but CupertinoTabBar would help.
If you don't want it, this video would be great url.
import 'dart:async';
import 'dart:io';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_inapp_purchase/flutter_inapp_purchase.dart';
class HomeScreen extends StatefulWidget {
#override
_HomeScreenState createState() => new _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final List<dynamic> pages = [
new Page1(),
new Page2(),
new Page3(),
new Page4(),
];
int currentIndex = 0;
#override
Widget build(BuildContext context) {
return new WillPopScope(
onWillPop: () async {
await Future<bool>.value(true);
},
child: new CupertinoTabScaffold(
tabBar: new CupertinoTabBar(
iconSize: 35.0,
onTap: (index) {
setState(() => currentIndex = index);
},
activeColor: currentIndex == 0 ? Colors.white : Colors.black,
inactiveColor: currentIndex == 0 ? Colors.green : Colors.grey,
backgroundColor: currentIndex == 0 ? Colors.black : Colors.white,
currentIndex: currentIndex,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.looks_one),
title: Text(''),
),
BottomNavigationBarItem(
icon: Icon(Icons.looks_two),
title: Text(''),
),
BottomNavigationBarItem(
icon: Icon(Icons.looks_3),
title: Text(''),
),
BottomNavigationBarItem(
icon: Icon(Icons.looks_4),
title: Text(''),
),
],
),
tabBuilder: (BuildContext context, int index) {
return new DefaultTextStyle(
style: const TextStyle(
fontFamily: '.SF UI Text',
fontSize: 17.0,
color: CupertinoColors.black,
),
child: new CupertinoTabView(
routes: <String, WidgetBuilder>{
'/Page1': (BuildContext context) => new Page1(),
'/Page2': (BuildContext context) => new Page2(),
'/Page3': (BuildContext context) => new Page3(),
'/Page4': (BuildContext context) => new Page4(),
},
builder: (BuildContext context) {
return pages[currentIndex];
},
),
);
},
),
);
}
}
class Page1 extends StatefulWidget {
#override
_Page1State createState() => _Page1State();
}
class _Page1State extends State<Page1> {
String title;
#override
void initState() {
title = 'Page1';
super.initState();
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text(title),
leading: new IconButton(
icon: new Icon(Icons.text_fields),
onPressed: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: (context) => Page13()));
},
)),
body: new Center(
child: new Text(title),
),
);
}
}
class Page2 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Page2'),
leading: new IconButton(
icon: new Icon(Icons.airline_seat_flat_angled),
onPressed: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: (context) => Page12()));
},
)),
body: new Center(
child: Column(
children: <Widget>[
CupertinoSlider(
value: 25.0,
min: 0.0,
max: 100.0,
onChanged: (double value) {
print(value);
}
),
],
),
),
);
}
}
class Page3 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Page3'),
),
body: new Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new RaisedButton(
child: new Text('Cupertino'),
textColor: Colors.white,
color: Colors.red,
onPressed: () {
List<int> list = List.generate(10, (int i) => i + 1);
list.shuffle();
var subList = (list.sublist(0, 5));
print(subList);
subList.forEach((li) => list.remove(li));
print(list);
}
),
new SizedBox(height: 30.0),
new RaisedButton(
child: new Text('Android'),
textColor: Colors.white,
color: Colors.lightBlue,
onPressed: () {
var mes = 'message';
var messa = 'メッセージ';
var input = 'You have a new message';
if (input.contains(messa) || input.contains(mes)) {
print('object');
} else {
print('none');
}
}
),
],
),
),
);
}
}
class Page4 extends StatelessWidget {
static List<int> ints = [1, 2, 3, 4, 5];
static _abc() {
print(ints.last);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Page4'),
),
body: new Center(
child: new RaisedButton(
child: new Text('Static', style: new TextStyle(color: Colors.white)),
color: Colors.lightBlue,
onPressed: _abc,
)),
);
}
}
class Page12 extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Page12'),
actions: <Widget>[
new FlatButton(
child: new Text('GO'),
onPressed: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: (context) => Page13()));
},
)
],
),
body: new Center(
child: new RaisedButton(
child: new Text('Swiper', style: new TextStyle(color: Colors.white)),
color: Colors.redAccent,
onPressed: () {},
)),
);
}
}
class Page13 extends StatefulWidget {
#override
_Page13State createState() => _Page13State();
}
class _Page13State extends State<Page13> with SingleTickerProviderStateMixin {
final List<String> _productLists = Platform.isAndroid
? [
'android.test.purchased',
'point_1000',
'5000_point',
'android.test.canceled',
]
: ['com.cooni.point1000', 'com.cooni.point5000'];
String _platformVersion = 'Unknown';
List<IAPItem> _items = [];
List<PurchasedItem> _purchases = [];
#override
void initState() {
super.initState();
initPlatformState();
}
Future<void> initPlatformState() async {
String platformVersion;
try {
platformVersion = await FlutterInappPurchase.platformVersion;
} on PlatformException {
platformVersion = 'Failed to get platform version.';
}
var result = await FlutterInappPurchase.initConnection;
print('result: $result');
if (!mounted) return;
setState(() {
_platformVersion = platformVersion;
});
// refresh items for android
String msg = await FlutterInappPurchase.consumeAllItems;
print('consumeAllItems: $msg');
}
Future<Null> _buyProduct(IAPItem item) async {
try {
PurchasedItem purchased = await FlutterInappPurchase.buyProduct(item.productId);
print('purchased: ${purchased.toString()}');
} catch (error) {
print('$error');
}
}
Future<Null> _getProduct() async {
List<IAPItem> items = await FlutterInappPurchase.getProducts(_productLists);
print(items);
for (var item in items) {
print('${item.toString()}');
this._items.add(item);
}
setState(() {
this._items = items;
this._purchases = [];
});
}
Future<Null> _getPurchases() async {
List<PurchasedItem> items = await FlutterInappPurchase.getAvailablePurchases();
for (var item in items) {
print('${item.toString()}');
this._purchases.add(item);
}
setState(() {
this._items = [];
this._purchases = items;
});
}
Future<Null> _getPurchaseHistory() async {
List<PurchasedItem> items = await FlutterInappPurchase.getPurchaseHistory();
for (var item in items) {
print('${item.toString()}');
this._purchases.add(item);
}
setState(() {
this._items = [];
this._purchases = items;
});
}
List<Widget> _renderInApps() {
List<Widget> widgets = this
._items
.map((item) => Container(
margin: EdgeInsets.symmetric(vertical: 10.0),
child: Container(
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 5.0),
child: Text(
item.toString(),
style: TextStyle(
fontSize: 18.0,
color: Colors.black,
),
),
),
FlatButton(
color: Colors.orange,
onPressed: () {
print("---------- Buy Item Button Pressed");
this._buyProduct(item);
},
child: Row(
children: <Widget>[
Expanded(
child: Container(
height: 48.0,
alignment: Alignment(-1.0, 0.0),
child: Text('Buy Item'),
),
),
],
),
),
],
),
),
))
.toList();
return widgets;
}
List<Widget> _renderPurchases() {
List<Widget> widgets = this
._purchases
.map((item) => Container(
margin: EdgeInsets.symmetric(vertical: 10.0),
child: Container(
child: Column(
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 5.0),
child: Text(
item.toString(),
style: TextStyle(
fontSize: 18.0,
color: Colors.black,
),
),
)
],
),
),
))
.toList();
return widgets;
}
#override
Widget build(BuildContext context) {
double screenWidth = MediaQuery.of(context).size.width-20;
double buttonWidth=(screenWidth/3)-20;
return new Scaffold(
appBar: new AppBar(),
body: Container(
padding: EdgeInsets.all(10.0),
child: ListView(
children: <Widget>[
Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Container(
child: Text(
'Running on: $_platformVersion\n',
style: TextStyle(fontSize: 18.0),
),
),
Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(
width: buttonWidth,
height: 60.0,
margin: EdgeInsets.all(7.0),
child: FlatButton(
color: Colors.amber,
padding: EdgeInsets.all(0.0),
onPressed: () async {
print("---------- Connect Billing Button Pressed");
await FlutterInappPurchase.initConnection;
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20.0),
alignment: Alignment(0.0, 0.0),
child: Text(
'Connect Billing',
style: TextStyle(
fontSize: 16.0,
),
),
),
),
),
Container(
width: buttonWidth,
height: 60.0,
margin: EdgeInsets.all(7.0),
child: FlatButton(
color: Colors.amber,
padding: EdgeInsets.all(0.0),
onPressed: () async {
print("---------- End Connection Button Pressed");
await FlutterInappPurchase.endConnection;
setState(() {
this._items = [];
this._purchases = [];
});
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20.0),
alignment: Alignment(0.0, 0.0),
child: Text(
'End Connection',
style: TextStyle(
fontSize: 16.0,
),
),
),
),
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Container(
width: buttonWidth,
height: 60.0,
margin: EdgeInsets.all(7.0),
child: FlatButton(
color: Colors.green,
padding: EdgeInsets.all(0.0),
onPressed: () {
print("---------- Get Items Button Pressed");
this._getProduct();
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20.0),
alignment: Alignment(0.0, 0.0),
child: Text(
'Get Items',
style: TextStyle(
fontSize: 16.0,
),
),
),
)),
Container(
width: buttonWidth,
height: 60.0,
margin: EdgeInsets.all(7.0),
child: FlatButton(
color: Colors.green,
padding: EdgeInsets.all(0.0),
onPressed: () {
print(
"---------- Get Purchases Button Pressed");
this._getPurchases();
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20.0),
alignment: Alignment(0.0, 0.0),
child: Text(
'Get Purchases',
style: TextStyle(
fontSize: 16.0,
),
),
),
)),
Container(
width: buttonWidth,
height: 60.0,
margin: EdgeInsets.all(7.0),
child: FlatButton(
color: Colors.green,
padding: EdgeInsets.all(0.0),
onPressed: () {
print(
"---------- Get Purchase History Button Pressed");
this._getPurchaseHistory();
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 20.0),
alignment: Alignment(0.0, 0.0),
child: Text(
'Get Purchase History',
style: TextStyle(
fontSize: 16.0,
),
),
),
)),
]),
],
),
Column(
children: this._renderInApps(),
),
Column(
children: this._renderPurchases(),
),
],
),
],
),
),
);
}
}

Use IndexedStack widget:
class Home extends StatefulWidget {
const Home({Key? key}) : super(key: key);
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
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'),
],
),
);
}
}
class HomePage extends StatelessWidget {
const HomePage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
print('build home');
return Center(child: Text('Home'));
}
}
class SettingsPage extends StatelessWidget {
const SettingsPage({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
print('build settings');
return Center(child: Text('Settings'));
}
}
Make sure the IndexedStack children widget list is constant. This will prevent the widgets from rebuilding when setState() is called.
IndexedStack(
index: _currentIndex,
children: const [
HomeWidget(),
SettingsWidget(),
],
),
The problem with IndexedStack is that all the widgets will be built at the same time when IndexedStack is initialized. For small widgets (like the example above), it won't be a problem. But for big widgets, you may see some performance issues.
Consider using the lazy_load_indexed_stack package. According to the package:
[LazyLoadIndexedStack widget] builds the required widget only when it is needed, and returns the pre-built widget when it is needed again
Again, make sure the LazyLoadIndexedStack children widgets are constant, otherwise they will keep rebuilding when setState is called.

If, you just need to remember the scroll position inside a list, the best option is to simply use a PageStoreKey object for the key property:
#override
Widget build(BuildContext context) {
return Container(
child: ListView.builder(
key: PageStorageKey<String>('some-list-key'),
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: items.length,
itemBuilder: (BuildContext context, int index) {
return GestureDetector(
onTap: () => _onElementTapped(index),
child: makeCard(items[index])
);
},
),
);
}
According to https://docs.flutter.io/flutter/widgets/PageStorageKey-class.html, this should work on ANY scrollable widget.

if i use the IndexedStack in the body it is loading only the main screen content not every other screen which is present in the bottom nativation bar.

Using IndexedStack with bloc pattern solved everthing.

Related

Flutter:How can i change the color of selected menu item from drawer

I am creating an app in flutter, I have got some issue in drawer. I want to change the color of the selected drawer item.Here is my full code it looks fine to me but its not working for me... please help me find out what i am doing wrong
class _DrawerClassState extends State<DrawerClass> {
Here is my full code it looks fine to me but its not working for me... please help me find out what i am doing wrong
List<String> menuStrings = [
'HOME',
'NOTIFICATIONS',
'PARTNERS',
'LOCATIONS',
'FEEDBACK',
'CONTACT US',
'AWARDS'
];
Here is my full code it looks fine to me but its not working for me... please help me find out what i am doing wrong
List menuScreens = [
HomeScreen(),
Notifications(),
Partners(),
Locations(),
FeedbackScreen(),
const ContactUs(),
Awards()
];
Here is my full code it looks fine to me but its not working for me... please help me find out what i am doing wrong
List<bool> isHighlighted = [false, false, false, false, true, false, false];
#override
Widget build(BuildContext context) {
return Theme(
data: Theme.of(context).copyWith(
canvasColor: Colors.black,
),
child: Drawer(
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
drawerTop("HI USER"),
ListView.builder(
shrinkWrap: true,
itemCount: menuScreens.length,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {
for (int i = 0; i < isHighlighted.length; i++) {
setState(() {
if (index == i) {
isHighlighted[index] = true;
} else {
//the condition to change the highlighted item
isHighlighted[i] = false;
}
});
}
},
child: drawerItems(
context,
menuStrings[index],
menuScreens[index],
isHighlighted[index] ? Colors.amber : Colors.white,
),
);
},
),
],
),
),
);
}
}
Here is the method drawerItems() to build drawer items
drawerItems(BuildContext context, String title, path, Color color) {
return Padding(
padding: EdgeInsets.only(
top: 0.0, left: MediaQuery.of(context).size.width * 0.1),
child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
GestureDetector(
onTap: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: ((context) => path)));
},
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 8.0),
child: Text(
title,
style: TextStyle(
color: color,
fontFamily: "Raleway Reg",
fontSize: 23,
letterSpacing: 2),
),
),
),
SizedBox(
width: MediaQuery.of(context).size.width * 0.5,
child: const Divider(
thickness: 1,
color: Colors.white,
height: 3,
),
),
]));
}
Update your drawerItems
drawerItems(BuildContext context, String title, path, Color color) {
return Container(
color: color,
padding: EdgeInsets.only(
top: 0.0, left: MediaQuery.of(context).size.width * 0.1),
child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
GestureDetector(
onTap: () {
Navigator.of(context)
.push(MaterialPageRoute(builder: ((context) => path)));
},
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 8.0),
child: Text(
title,
style: TextStyle(
color: color,
fontFamily: "Raleway Reg",
fontSize: 23,
letterSpacing: 2),
),
),
),
SizedBox(
width: MediaQuery.of(context).size.width * 0.5,
child: const Divider(
thickness: 1,
color: Colors.white,
height: 3,
),
),
]));
}
the root widget that is returned from the method, change it from Padding to Container and give it a color
I think it's a very complex solution to solve this simple task in Flutter.
I suggest my solution:
Publish it on my git:
https://github.com/igdmitrov/flutter-drawer
Create a new Abstract Page State:
abstract class MyPageState<T extends StatefulWidget> extends State {
List<Widget> drawerItems(BuildContext context) {
return menuItems
.map(
(item) => ListTile(
leading: const Icon(Icons.my_library_books),
title: Text(
item['menuName'] as String,
style: TextStyle(
color: isHighlighted[menuItems.toList().indexOf(item)]
? Colors.amber
: Colors.grey),
),
onTap: () {
isHighlighted = isHighlighted.map((mark) => false).toList();
isHighlighted[menuItems.toList().indexOf(item)] = true;
Navigator.of(context).push(MaterialPageRoute(
builder: ((context) => item['route'] as Widget)));
},
),
)
.toList();
}
}
Create drawer.dart file with code:
final menuItems = {
{'menuName': 'HOME', 'route': const HomeScreen()},
{'menuName': 'NOTIFICATIONS', 'route': const Notifications()},
};
List<bool> isHighlighted = [false, false];
And create pages:
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
MyPageState<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends MyPageState<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Main page'),
),
drawer: Drawer(
child: ListView(
children: [
const Text("HI USER"),
...drawerItems(context),
],
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [
Text(
'New app',
),
],
),
),
);
}
}
And Notifications page:
class Notifications extends StatefulWidget {
static String routeName = '/notifications';
const Notifications({Key? key}) : super(key: key);
#override
MyPageState<Notifications> createState() => _NotificationsState();
}
class _NotificationsState extends MyPageState<Notifications> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Notifications'),
),
drawer: Drawer(
child: ListView(
children: [
const Text("HI USER"),
...drawerItems(context),
],
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const [
Text(
'Notifications page',
),
],
),
),
);
}
}

Flutter|Updating a ListView

everyone!
I have a HomeScreen, with this code:
return SafeArea(
child: Scaffold(
body: Stack(
children: [
Padding(
padding: const EdgeInsets.only(left: 8, right: 8),
child: Column(children: [
ActiveTaskInfo(
task: tasks.first,
),
const TextWidget(),
Expanded(child: TasksList()),
const SizedBox(height: 80),
]),
),
BottomBarClass(),
],
),
),
);
TasksList() - ListView.
BottomBarClass() - It is a container with a button inside.
If you return the code itself to the main HomeScreen file, everything works, but if you put it in a separate class and when you add a new item to the list (through the button) nothing happens, but if you press Hot Reload, then the new item in the list is displayed.
Code BottomBarClass():
Positioned(
bottom: 0, left: 0,
child: ClipRRect(
borderRadius: const BorderRadius.only(topRight: Radius.circular(30), topLeft: Radius.circular(30)),
child: Container(
height: 80, width: MediaQuery.of(context).size.width,
color: const Color(0xff070417),
child: Row(mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Icon(Icons.watch_later, color: Colors.white.withOpacity(0.4)),
IconButton(icon: Icon(Icons.add, color: Colors.white.withOpacity(0.4),), iconSize: 32, onPressed: () async {
bool result = await Navigator.push(context, MaterialPageRoute(builder: (context) {
return TaskAdding();
}));
if (result == true) {
setState(() {
});
}
}),
Icon(Icons.pie_chart_rounded, color: Colors.white.withOpacity(0.4), size: 24,),
],),
),
));
Вот пример GIF: https://gifyu.com/image/Spp1O
TaskAdding():
import 'package:flutter/material.dart';
import '../expansions/task_tags_decorations.dart';
import '../expansions/tasks_data.dart';
class TaskAdding extends StatefulWidget {
const TaskAdding({Key? key}) : super(key: key);
#override
State<TaskAdding> createState() => _TaskAddingState();
}
class _TaskAddingState extends State<TaskAdding> {
late String _addField;
late Widget _selectedValue;
late bool _active;
late int _selectedIndex;
#override
void initState() {
_addField = 'Empty';
_active = false;
_selectedValue = tasks[0].icon;
_selectedIndex = 0;
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Add'), backgroundColor: Colors.pink),
body: Column(children: [
Text('Add Task', style: TextStyle(color: Colors.white, fontSize: 24),),
TextField(onChanged: (String value) {
_addField = value;
}),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
DropdownButton<Widget>(
value: _selectedValue,
onChanged: (newValue) {
setState(() {
_selectedValue = newValue!;
});
},
items: dropdownItems,
),
ElevatedButton(
onPressed: () {
setState(() {
tasks.addAll({
TaskData(
taskName: _addField,
tagOne: _active
? tasks[0].tagOne
: tasks[1].tagOne,
tagTwo: tagTwoContainer[_selectedIndex],
icon: _selectedValue,
taskTime: '00:32:10',
)
});
decorations.addAll({
TaskTagsDecorations(
iconColor: const Color(0xff7012CF))
});
});
Navigator.of(context).pop(true);
},
child: const Text('Add')),
],
),
Center(
child: ListTile(
title: _active
? Center(
child: tasks[0].tagOne,
)
: Center(child: tasks[1].tagOne),
selected: _active,
onTap: () {
setState(() {
_active = !_active;
});
},
),
),
SizedBox(
height: 52,
child: ListView.builder(
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemCount: tagTwoContainer.length,
itemBuilder: (context, index) {
var tagTwoList = tasks[index].tagTwo;
return SizedBox(
height: MediaQuery.of(context).size.height, width: 160,
child: ListTile(
visualDensity: VisualDensity.compact,
selected: index == _selectedIndex,
selectedTileColor: Colors.indigo.withOpacity(0.6),
title: Align(
alignment: Alignment.topCenter,
child: tagTwoList),
onTap: () {
setState(() {
_selectedIndex = index;
});
},
),
);
}),
),
],),
);
}
List<DropdownMenuItem<Widget>> get dropdownItems {
List<DropdownMenuItem<Widget>> menuItems = [
DropdownMenuItem(
child: const Icon(Icons.free_breakfast),
value: iconCircle[0],
),
DropdownMenuItem(
child: const Icon(Icons.grade_outlined), value: iconCircle[1]),
DropdownMenuItem(child: const Icon(Icons.gamepad), value: iconCircle[2]),
DropdownMenuItem(
child: const Icon(Icons.face_rounded), value: iconCircle[3]),
];
return menuItems;
}
}
You question is not clear. Try to add TasksList()
My solution:
Navigator.push(context,
MaterialPageRoute(builder: (context) {
return HomeScreen();
}));

Search delegate , When I click on Search button it shows red screen with error child! =null

I create a search option by search delegate but When I click on search button it shows the red screen with this error "The following assertion was thrown building _SearchPage(dirty, dependencies: [_LocalizationsScope-[GlobalKey#69e74], _InheritedTheme], state: _SearchPageState#72bb6): 'package:flutter/src/widgets/basic.dart': Failed assertion: line 6938 pos 15: 'child != null': is not true.
import 'package:flutter/material.dart';
import 'package:grk_001/screen/main_screen.dart';
import 'widgets/entry_item.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:grk_001/screen/favourite_screen.dart';
import 'package:grk_001/Provider/Auth.dart';
import 'package:provider/provider.dart';
import 'package:grk_001/Provider/cart.dart';
import 'package:grk_001/widgets/badge.dart';
import 'package:grk_001/screen/cart_screen.dart';
import 'package:grk_001/widgets/drawer.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:grk_001/models/main_screen_categories_entry.dart';
class HomeScreen extends StatefulWidget {
static const String routename = 'homescreen';
#override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final GlobalKey<ScaffoldState> _scaffoldkey = GlobalKey<ScaffoldState>();
FirebaseUser Loggedinuser;
#override
void didChangeDependencies() {
// TODO: implement didChangeDependencies
Future.delayed(Duration.zero).then((_) async {
await Provider.of<Auth>(context, listen: false).getcurrentuser();
});
super.didChangeDependencies();
}
#override
Widget build(BuildContext context) {
final devicesize = MediaQuery.of(context).size;
return SafeArea(
child: Scaffold(
key: _scaffoldkey,
appBar: AppBar(
leading: IconButton(
onPressed: () {
_scaffoldkey.currentState.openDrawer();
},
icon: Icon(
Icons.list,
color: Colors.white,
size: 35.0,
),
),
bottom: PreferredSize(
preferredSize: const Size.fromHeight(50.0),
child: Container(
padding: const EdgeInsets.all(8.0),
child: Row(
children: <Widget>[
const SizedBox(
width: 10.0,
),
Expanded(
child: GestureDetector(
onTap: () {
_scaffoldkey.currentState.openEndDrawer();
},
child: Container(
padding: const EdgeInsets.all(8.0),
alignment: Alignment.center,
height: 40.0,
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(5.0),
),
child: Text(
'Categories',
),
),
),
),
],
),
),
),
title: Text('HomeScreen'),
actions: <Widget>[
IconButton(
icon: Icon(Icons.search),
onPressed: () {
showSearch(context: context, delegate: DataSearch());
},
),
IconButton(
icon: Icon(
FontAwesomeIcons.heart,
size: 30.0,
),
tooltip: 'My Wish List',
onPressed: () {
Navigator.pushNamed(context, FavouriteScreen.routename);
},
),
IconButton(
icon: Icon(
Icons.notifications,
size: 30.0,
),
tooltip: 'My Notifications',
onPressed: () {},
),
Consumer<Cart>(
builder: (_, cartdata, ch) => Badge(
child: ch,
value: cartdata.itemcount.toString(),
),
child: IconButton(
onPressed: () {
Navigator.pushNamed(context, CartScreen.routename);
},
icon: Icon(
Icons.shopping_cart,
size: 40.0,
),
),
),
],
),
body: MainScreen(),
// body: CategoryScreen(),
endDrawer: Drawer(
child: Column(
children: <Widget>[
Container(
color: Color(0XFFFF4081),
height: devicesize.height * 0.10,
child: DrawerHeader(
margin: EdgeInsets.zero,
child: InkWell(
onTap: () {
Navigator.of(context).pop();
},
child: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Icon(
Icons.apps,
color: Colors.white,
),
SizedBox(
width: 10.0,
),
Text(
'Categories',
style:
TextStyle(color: Colors.white, fontSize: 20.0),
),
],
),
)
// child: Text('Categories'),
),
),
Container(
height: devicesize.height * 0.85,
child: ListView.builder(
itemBuilder: (context, index) => EntryItem(data[index]),
itemCount: data.length,
),
)
],
),
),
drawer: Container(
width: devicesize.width * 0.65,
child: DrawerItem(devicesize, context),
),
),
);
}
}
class DataSearch extends SearchDelegate<String> {
final statelist = [
'Andaman and Nicobar Islands',
' Andhra Pradesh',
'Arunachal Pradesh',
'Assam',
'Bihar',
'Chandigarh ',
'Chhattisgarh',
'Dadra and Nagar Havel',
'Daman and Diu',
'Delhi',
'Goa',
'Gujrat',
'Haryana',
'Himachal Pradesh',
'Uttar Pradesh',
'Uttarakhand',
'West Bengal',
'Sikkim',
'Meghalya',
'Mizoram',
];
final recentlist = ['Modingar', 'Ghaziabad', 'Merrut', 'Hapur', 'Delhi'];
#override
List<Widget> buildActions(BuildContext context) {
// action for app bar
return [
IconButton(
onPressed: () {
query = "";
},
icon: Icon(Icons.clear),
)
];
}
#override
Widget buildLeading(BuildContext context) {
// leading icon on the left of the app bar
return IconButton(
icon: AnimatedIcon(
icon: AnimatedIcons.menu_arrow,
progress: transitionAnimation,
),
onPressed: () {
close(context, null);
},
);
}
#override
Widget buildResults(BuildContext context) {
// TODO: implement buildResults
return Container(
height: 150.0,
child: Card(
color: Colors.red,
shape: StadiumBorder(),
child: Text(query),
),
);
}
#override
Widget buildSuggestions(BuildContext context) {
// TODO: implement buildSuggestions
final suggestionList = query.isEmpty
? recentlist
: statelist.where((element) => element.startsWith(query)).toList();
ListView.builder(
itemBuilder: (context, index) => ListTile(
onTap: () {
showResults(context);
},
title: RichText(
text: TextSpan(
text: suggestionList[index].substring(0, query.length),
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
),
children: [
TextSpan(
text: suggestionList[index].substring(query.length),
style: TextStyle(color: Colors.grey))
]),
)),
itemCount: suggestionList.length,
);
}
}
You can copy paste run full code below
You need return keyword in buildSuggestions
You can return ListView.builder
code snippet
#override
Widget buildSuggestions(BuildContext context) {
// TODO: implement buildSuggestions
final suggestionList = query.isEmpty
? recentlist
: statelist.where((element) => element.startsWith(query)).toList();
return ListView.builder(
working demo
full code
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
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 _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text(widget.title), actions: <Widget>[
IconButton(
icon: Icon(Icons.search),
onPressed: () {
showSearch(context: context, delegate: DataSearch());
},
),
]),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class DataSearch extends SearchDelegate<String> {
final statelist = [
'Andaman and Nicobar Islands',
' Andhra Pradesh',
'Arunachal Pradesh',
'Assam',
'Bihar',
'Chandigarh ',
'Chhattisgarh',
'Dadra and Nagar Havel',
'Daman and Diu',
'Delhi',
'Goa',
'Gujrat',
'Haryana',
'Himachal Pradesh',
'Uttar Pradesh',
'Uttarakhand',
'West Bengal',
'Sikkim',
'Meghalya',
'Mizoram',
];
final recentlist = ['Modingar', 'Ghaziabad', 'Merrut', 'Hapur', 'Delhi'];
#override
List<Widget> buildActions(BuildContext context) {
// action for app bar
return [
IconButton(
onPressed: () {
query = "";
},
icon: Icon(Icons.clear),
)
];
}
#override
Widget buildLeading(BuildContext context) {
// leading icon on the left of the app bar
return IconButton(
icon: AnimatedIcon(
icon: AnimatedIcons.menu_arrow,
progress: transitionAnimation,
),
onPressed: () {
close(context, null);
},
);
}
#override
Widget buildResults(BuildContext context) {
// TODO: implement buildResults
return Container(
height: 150.0,
child: Card(
color: Colors.red,
shape: StadiumBorder(),
child: Text(query),
),
);
}
#override
Widget buildSuggestions(BuildContext context) {
// TODO: implement buildSuggestions
final suggestionList = query.isEmpty
? recentlist
: statelist.where((element) => element.startsWith(query)).toList();
return ListView.builder(
itemBuilder: (context, index) => ListTile(
onTap: () {
showResults(context);
},
title: RichText(
text: TextSpan(
text: suggestionList[index].substring(0, query.length),
style: TextStyle(
color: Colors.black,
fontWeight: FontWeight.bold,
),
children: [
TextSpan(
text: suggestionList[index].substring(query.length),
style: TextStyle(color: Colors.grey))
]),
)),
itemCount: suggestionList.length,
);
}
}

How to change price on button pressed in flutter

SCENARIO
I have a dummy image, under image there is price and under price there three widget
Two widget are buttons (+) and (-) and one widget is Text('1') which is a QTY.
QUESTION
When i click on the button it increment and decrement the number but how do i change the price based on QTY (if QTY is 2 then price must be double)
class Quantities extends StatefulWidget {
final productprice;
final productimage;
Quantities({this.productprice, this.productimage});
#override
_QuantitiesState createState() => _QuantitiesState(productprice,productimage);
}
class _QuantitiesState extends State<Quantities> {
int counter = 1;
final productprice;
final productimage;
_QuantitiesState(this.productprice, this.productimage);
void increment() {
setState(() {
counter++;
});
}
void decrement() {
setState(() {
counter--;
});
}
#override
Widget build(BuildContext context) {
return PlatformScaffold(
appBar: PlatformAppBar(
backgroundColor: Colors.lightBlue[900],
title: Text('Quantities'),
),
body: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: ListView(
children: <Widget>[
new Container(
height: 200.0,
child: GridTile(
child: Container(
color: Colors.white,
child: Image.asset(productimage),),),),
Center(
child: Text(
productprice,),),
Padding(
padding: const EdgeInsets.only(top: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 10.0),
child: PlatformButton(
onPressed: () {
decrement();
if (counter < 1) {
counter = 1;
}
},
child: Text(
'-',
),
androidFlat: (_) =>
MaterialFlatButtonData(color: Colors.cyan),
ios: (_) => CupertinoButtonData(
color: Colors.cyan
)),
),
Text(
'$counter',
),
Padding(
padding: const EdgeInsets.only(left: 10.0),
child: PlatformButton(
onPressed: () {
increment();
},
child: Text(
'+',
style: TextStyle(color: Colors.white, fontSize: 30.0),
),
androidFlat: (_) =>
MaterialFlatButtonData(color: Colors.cyan),
ios: (_) => CupertinoButtonData(
color: Colors.cyan
)),
this is the full code example:
import 'package:flutter/material.dart';
import 'package:project_app/proyects/home.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Product price',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Quantities(productimage: "",productprice: "20$",),
);
}
}
class Quantities extends StatefulWidget {
final productprice;
final productimage;
Quantities({this.productprice, this.productimage});
#override
_QuantitiesState createState() =>
_QuantitiesState(productprice, productimage);
}
class _QuantitiesState extends State<Quantities> {
int counter = 1;
final productprice;
double finalprice;
final productimage;
final productp =productprice.replaceAll(new RegExp(r'\$'), '');
_QuantitiesState(this.productprice, this.productimage);
void increment() {
setState(() {
counter++;
finalprice=double.parse(productp)*counter;
});
}
void decrement() {
setState(() {
counter--;
finalprice=double.parse(productp)*counter;
});
}
#override
void initState() {
super.initState();
finalprice= double.parse(productp);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.lightBlue[900],
title: Text('Quantities'),
),
body: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: ListView(
children: <Widget>[
Center(
child: Text(
finalprice.toString(),
),
),
Padding(
padding: const EdgeInsets.only(top: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(right: 10.0),
child: FlatButton(
onPressed: () {
if (counter > 1) {
decrement();
}
},
child: Text(
'-',
),
),
),
Text(
'$counter',
),
Padding(
padding: const EdgeInsets.only(left: 10.0),
child: FlatButton(
onPressed: () {
increment();
},
child: Text(
'+',
style:
TextStyle(color: Colors.white, fontSize: 30.0),
),
),
),
]),
),
],
),
));
}
}
In this case you need to multiply the value of product price in
setstate(){
productprice=productprice*counter;
}
or
productprice*=counter;

How do I insert my Hero-Widget-Page to a BottomNavigationBar?

I am trying to build an App with a Bottomnavigationbar, which has my Home Screen on the first tab and my Hero-Widget-Page on the other tab.
The Problem is, that I need the context variable inside my Hero widget, and by using the List<Widget> for my different BottomNavigationBar Pages I only can display simple widgets like Text.
class _MyHomePageState extends State<MyHomePage>
{
int _selectedIndex = 0;
static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
static const List<Widget> _widgetOptions = <Widget>[
Text( // on this place I want to add what is in the body now
'Home',
style: optionStyle,
),
Text(
'Devices',
style: optionStyle,
)
];
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: color_1,
title: Text("Device Manager"),
),
body: Row( // here I want to insert _widgetOptions.elementAt(_selectedIndex) instead of the Herowidget itself
children: [
Hero(
tag: 'matrix1',
child: GestureDetector(
onTap: () => Navigator.push(context, MaterialPageRoute(builder: (context) => MatrixPageOne())),
child: Column(
children: <Widget>[
Image( image: new AssetImage('imgs/matrix1.png'),
height: 100,
width: 100,),
Text("Matrix Kitchen", style: mytextStyle,),
]
)
),
),
Hero(
tag: 'matrix2',
child: GestureDetector(
onTap: () => Navigator.push(context, MaterialPageRoute(builder: (context) => MatrixPageTwo())),
child: Column(
children: <Widget>[
Image( image: new AssetImage('imgs/matrix2.png'),
height: 100,
width: 100,),
Text("PARTY ROOM", style: mytextStyle,),
]
)
),
),
] // wrap children
),
bottomNavigationBar: BottomNavigationBar(
backgroundColor: color_1,
currentIndex: _selectedIndex,
selectedItemColor: color_2,
onTap: _onItemTapped,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.devices),
title: Text("Home")),
BottomNavigationBarItem(
icon: Icon(Icons.devices),
title: Text("Devices"))
]
)
);
} // Widget build
} // class _MyHomePageState
}
Like this the Hero widget will be displayed on both pages, so the bottomNavigationBar is not working.
I thank everyone who has an idea on doing this right, I've already been trying this for two days!
This should work for you
class _MyHomePageStateState extends State<MyHomePageState> {
static const TextStyle optionStyle = TextStyle(fontSize: 30, fontWeight: FontWeight.bold);
final _widgetOptions = <Widget>[
HeroPageHome(),
HeroPageDevices()
];
int _selectedIndex = 0;
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: color_1,
title: Text("Device Manager"),
),
body: _widgetOptions.elementAt(_selectedIndex),
bottomNavigationBar: BottomNavigationBar(
backgroundColor: color_1,
currentIndex: _selectedIndex,
selectedItemColor: color_2,
onTap: _onItemTapped,
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.devices),
title: Text("Home")
),
BottomNavigationBarItem(
icon: Icon(Icons.devices),
title: Text("Devices")
)
]
)
);
}
}
Note that I created separate classes for your Hero pages.
class HeroPageHome extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Hero(
tag: 'matrix1',
child: GestureDetector(
onTap: () => Navigator.push(context, MaterialPageRoute(builder: (context) => MatrixPageOne())),
child: Column(
children: <Widget>[
Image( image: new AssetImage('imgs/matrix1.png'),
height: 100,
width: 100,
),
Text("Matrix Kitchen", style: mytextStyle,),
]
)
),
);
}
}
class HeroPageDevices extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Hero(
tag: 'matrix2',
child: GestureDetector(
onTap: () => Navigator.push(context, MaterialPageRoute(builder: (context) => MatrixPageTwo())),
child: Column(
children: <Widget>[
Image( image: new AssetImage('imgs/matrix2.png'),
height: 100,
width: 100,
),
Text("PARTY ROOM", style: mytextStyle,),
]
)
),
);
}
}