Develop Reference

Flutter Nested ListView in FutureBuilder with CheckboxListTyle Returns Constraint Error

Hello so the problem i am having is the following code
return Scaffold(
body: Padding(
padding: EdgeInsets.all(20),
child: Row(
children: [
const SizedBox(width: 15),
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(widget.routine.title!, style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20)),
SizedBox(height: 6),
Text(widget.routine.description!),
const Divider(
height: 10,
thickness: 2,
indent: 20,
endIndent: 0,
color: Colors.white,
),
FutureBuilder<List<RoutineTask>>(
future: _getRoutineTasks(widget.routine.id!),
builder: (BuildContext context, AsyncSnapshot<List<RoutineTask>> snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if(snapshot.data == null) {
return Center(
child: Text("No Tasks!"),
);
} else if (snapshot.hasError) {
return Center(
child: Text("An Error has Occured: ${snapshot.error}"),
);
} else {
return ListView.separated(
reverse: false,
itemCount: snapshot.data!.length,
scrollDirection: Axis.vertical,
shrinkWrap: true,
separatorBuilder: (BuildContext context, index) => const Divider(),
itemBuilder: (BuildContext context, index) {
return Container(
height: MediaQuery.of(context).size.height * 0.45,
decoration: BoxDecoration(
color: Colors.blue,
borderRadius: BorderRadius.circular(25)
),
child: CheckboxListTile(
value: snapshot.data![index].isComplete,
onChanged: (bool? value) {
setState(() {
snapshot.data![index].isComplete = value;
});
},
),
);
},
);
}
} else {
return Center(child: CircularProgressIndicator(),);
}
}
)
],
),
],
)),
);
is Returning the error
'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1869 pos 16: 'constraints.hasBoundedWidth': is not true.
and i have no idea how to fix it, been trying every possible combination i can come up with.

Edited: This works. Try to follow this tree structure.
return Scaffold(
body: Row(
children:[
Text('ROWWWWWWWWWWW'),
Expanded(
child: Column(
children:[
Text('COLUMN'),
Expanded(
child: ListView(
children:[
Text('LISTVIEW'),
],
),
),
]
),
)
],
),
);

Flutter DraggableScrollableSheet Lock One Part on top

I Had Question For how create Scroll List Like this
Flutter Scroll List Over Header
According to the answers given, I used DraggableScrollableSheet for implementing this scroll view
but now i have new problem
The Result is here:
now I need to when im scrolling the top Child Stay On Top, like a header
how can do this?
Here is my Code
class HomeScreen extends StatelessWidget {
const HomeScreen({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
double height = MediaQuery.of(context).size.height;
AppController appController = Provider.of<AppController>(context);
HomeController homeController = Provider.of<HomeController>(context);
String selectedCategory = homeController.selectedCategory;
return SafeArea(
child: Container(
//height: 450,
width: double.infinity,
decoration: const BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/images/home_header.png'),
alignment: Alignment.topCenter,
)),
child: Scaffold(
appBar: AppBar(
backgroundColor: Colors.transparent,
elevation: 0,
flexibleSpace: Padding(
padding: const EdgeInsets.only(left: 20, right: 20),
child: ChiscoAppbar(
icon: MENU,
iconAlignment: Alignment.centerLeft,
title: 'خانه',
onClick: () {
Navigator.pushNamed(context, '/account');
},
),
),
),
backgroundColor: Colors.transparent,
body: Stack(
children: [
Positioned(
child: Container(
color: Colors.transparent,
height: 200,
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
const Expanded(
flex: 3,
child: Align(
alignment: Alignment.center,
child: ChiscoText(
text: 'دستگاه‌های هوشمند چیسکو',
fontWeight: FontWeight.w500,
textColor: Colors.white,
fontSize: 16,
)),
),
Expanded(
flex: 1,
child: Padding(
padding: EdgeInsets.only(left: 20, right: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: const [
HeaderItem(
titleText: 'کنترلر',
icon: COOLER,
counterText: '2',
),
HeaderItem(
titleText: 'سه راهی',
icon: SOCKET,
counterText: '2',
)
],
),
)),
],
),
),
),
Positioned(
child: DraggableScrollableSheet(
expand: true,
minChildSize: 0.70,
maxChildSize: 0.95,
initialChildSize: 0.70,
builder: (context, scrollController) {
return SingleChildScrollView(
controller: scrollController,
child: Container(
decoration: BoxDecoration(
color: Colors.blue[100],
borderRadius: const BorderRadius.only(
topLeft: Radius.circular(25),
topRight: Radius.circular(25))),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
ListHandlerView(),
Container(
margin: const EdgeInsets.fromLTRB(20, 8, 20, 10),
height: 30,
child: ListView.builder(
shrinkWrap: true,
physics: const BouncingScrollPhysics(),
itemCount: appController
.listOfDevicesCategory.length,
scrollDirection: Axis.horizontal,
primary: true,
addSemanticIndexes: false,
itemBuilder: (context, index) {
String category = appController
.listOfDevicesCategory[index];
return CategoryListItem(
isSelected: selectedCategory == category,
category: category,
);
}),
),
ListView.builder(
physics: const NeverScrollableScrollPhysics(),
shrinkWrap: true,
itemCount: 25,
itemBuilder: (BuildContext context, int index) {
return ListTile(title: Text('Item $index'));
},
),
],
),
),
);
},
),
)
],
),
floatingActionButton: Container(
margin: const EdgeInsets.only(bottom: 16),
child: const ChiscoSpeedDial()),
floatingActionButtonLocation:
FloatingActionButtonLocation.startDocked,
),
),
);
}
}

I think it is better to use bottom from SliverAppBar. Run below widget to see the result
class DAX extends StatefulWidget {
DAX({Key? key}) : super(key: key);
#override
State<DAX> createState() => _DAXState();
}
class _DAXState extends State<DAX> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: CustomScrollView(
slivers: [
SliverAppBar(
expandedHeight: 200,
pinned: true,
backgroundColor: Colors.blue,
elevation: 0,
bottom: PreferredSize(
preferredSize: Size.fromHeight(60),
child: ColoredBox(
color: Colors.blue,
child: Container(
clipBehavior: Clip.hardEdge,
padding: EdgeInsets.all(8),
decoration: BoxDecoration(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(12),
topRight: Radius.circular(12),
),
color: Colors.white,
),
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
children: List.generate(
12,
(index) => Chip(
label: Text("chip $index"),
),
),
),
),
),
)),
),
SliverList(
delegate: SliverChildBuilderDelegate(
(context, index) => Container(
alignment: Alignment.center,
height: 100,
child: Text("$index"),
),
),
),
],
),
),
);
}
}

The method 'MaterialPageRoute' isn't defined

I have been learning to make an app in flutter for 2 weeks using flutter documentation. Today, I have come to this problem regarding Navigator.push(). This was working fine, but it is not after I restart my laptop. And I can't find a solution, I tried
flutter clean
reinstalled flutter and dart plugins
These solutions didn't help.
Code:
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_foodybite/screens/trending.dart';
import 'package:flutter_foodybite/util/categories.dart';
import 'package:flutter_foodybite/util/friends.dart';
import 'package:flutter_foodybite/util/restaurants.dart';
import 'package:flutter_foodybite/widgets/category_item.dart';
import 'package:flutter_foodybite/widgets/search_card.dart';
import 'package:flutter_foodybite/widgets/slide_item.dart';
class Home extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: buildSearchBar(context),
body: Padding(
padding: EdgeInsets.fromLTRB(10.0, 0, 10.0, 0),
child: ListView(
children: <Widget>[
SizedBox(height: 20.0),
buildCategoryRow('Trending Restaurants', context),
SizedBox(height: 10.0),
buildRestaurantList(context),
SizedBox(height: 10.0),
buildCategoryRow('Category', context),
SizedBox(height: 10.0),
buildCategoryList(context),
SizedBox(height: 20.0),
buildCategoryRow('Friends', context),
SizedBox(height: 10.0),
buildFriendsList(),
SizedBox(height: 30.0),
],
),
),
);
}
buildCategoryRow(String category, BuildContext context) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"$category",
style: TextStyle(
fontSize: 20.0,
fontWeight: FontWeight.w800,
),
),
FlatButton(
child: Text(
"Trending",
style: TextStyle(
color: Theme.of(context).accentColor,
),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (BuildContext context) {
return Trending();
},
),
);
},
),
],
);
}
buildSearchBar(BuildContext context) {
return PreferredSize(
child: Padding(
padding: EdgeInsets.only(
top: Platform.isAndroid ? 30.0 : 50.0,
left: 10.0,
right: 10.0,
),
child: SearchCard(),
),
preferredSize: Size(
MediaQuery.of(context).size.width,
60.0,
),
);
}
buildCategoryList(BuildContext context) {
return Container(
height: MediaQuery.of(context).size.height / 6,
child: ListView.builder(
primary: false,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: categories == null ? 0 : categories.length,
itemBuilder: (BuildContext context, int index) {
Map cat = categories[index];
return CategoryItem(
cat: cat,
);
},
),
);
}
buildRestaurantList(BuildContext context) {
return Container(
height: MediaQuery.of(context).size.height / 2.4,
width: MediaQuery.of(context).size.width,
child: ListView.builder(
primary: false,
shrinkWrap: true,
scrollDirection: Axis.horizontal,
itemCount: restaurants == null ? 0 : restaurants.length,
itemBuilder: (BuildContext context, int index) {
Map restaurant = restaurants[index];
return Padding(
padding: EdgeInsets.only(right: 10.0),
child: SlideItem(
img: restaurant["img"],
title: restaurant["title"],
address: restaurant["address"],
rating: restaurant["rating"],
),
);
},
),
);
}
buildFriendsList() {
return Container(
height: 50.0,
child: ListView.builder(
primary: false,
scrollDirection: Axis.horizontal,
shrinkWrap: true,
itemCount: friends == null ? 0 : friends.length,
itemBuilder: (BuildContext context, int index) {
String img = friends[index];
return Padding(
padding: EdgeInsets.only(right: 5.0),
child: CircleAvatar(
backgroundImage: AssetImage(
img,
),
radius: 25.0,
),
);
},
),
);
}
}
Please have a look at the attached picture below for the highlighted error.
Here is error encountered
This is an error

Try this
flutter upgrade --force

You should use like this
Navigator.of(context)
.push(
MaterialPageRoute(
builder: (BuildContext context) => Trending(),
),
);

How to remove empty space below tab.. FLUTTER

This is my code implementation:
return Scaffold(
appBar: CustomAppBar(
scaffoldKey: widget.scaffoldKey,
// icon: AppIcon.settings,
// onActionPressed: onSettingIconPressed,
onSearchChanged: (text) {
setState(() {
if (text.length > 0) {
searching = true;
} else {
searching = false;
}
});
state.filterByUsername(text);
},
),
backgroundColor: Colors.white,
body:
// Column(children: [
RefreshIndicator(
backgroundColor: Colors.white,
onRefresh: () async {
HapticFeedback.selectionClick();
setState(() {
list3 = state2.getTweetList(authstate.userModel);
list3.shuffle();
onlyImages.shuffle();
});
state.getDataFromDatabase();
return Future.value(true);
},
// mesto povise greed, i ispod search boxa
child: Column(
children: <Widget>[
CarouselSlider.builder(
itemCount: images.length,
options: CarouselOptions(
// autoPlayInterval: Duration(milliseconds: 30),
autoPlay: true,
aspectRatio: 2.0,
enlargeCenterPage: true,
),
itemBuilder: (context, index) {
return Container(
child: Center(
child: (imageUrl != null)
? Image.network(imageUrl)
: Placeholder(
fallbackHeight: 200,
fallbackWidth: double.infinity,
),
// Center(
// child: Image.network(images[index],
// fit: BoxFit.cover, width: 1000)
),
);
},
),
SizedBox(
height: 5,
),
Expanded(
// flex: 1,
child: CustomScrollView(slivers: <Widget>[
SliverToBoxAdapter(
child: Container(
padding: EdgeInsets.only(top: 0),
height: 30,
margin: EdgeInsets.only(top: 5, bottom: 5),
child: ListView(
scrollDirection: Axis.horizontal,
children: <Widget>[
_tagItem('#DAJGI'),
_tagItem('#Advertisements'),
_tagItem('Animal'),
_tagItem('Travel'),
_tagItem('Happy'),
_tagItem(
'Art',
),
]))),
]),
),
searching
? ListView.separated(
addAutomaticKeepAlives: false,
physics: BouncingScrollPhysics(),
itemBuilder: (context, index) =>
_UserTile(user: list[index]),
separatorBuilder: (_, index) => Divider(
color: Colors.transparent,
height: 0,
),
itemCount: list?.length ?? 0,
)
: Expanded(
child: GridView.count(
crossAxisCount: 3,
children:
List.generate(onlyImages.length, (index) {
return GestureDetector(
onTap: () {
FeedModel model = onlyImages[index];
onTweetPressed(context, model);
},
onLongPress: () {
_createPopupContext;
FeedModel model = onlyImages[index];
onTweetPressed(context, model);
},
child: Container(
child: Card(
child: onlyImages
.elementAt(index)
.imagesPath
.length >
0
? CachedNetworkImage(
imageUrl: onlyImages
.elementAt(index)
.imagesPath[0],
fit: BoxFit.cover,
)
:
//Container()
Center(
child: Text(onlyImages
.elementAt(index)
.description),
)),
));
}),
),
),
],
)))
Result:

hi in your column you have 2 Expanded Widget so your Tags get more space;
column(
children:[
CarouselSlider
Expanded(
// flex: 1,
child: CustomScrollView // Your Tags )
Expanded(
child: GridView.count( // Your Grid)
]
)
now you can remove Expanded and CustomScrollView and SliverToBoxAdapter
and make your column like below
column(
children:[
CarouselSlider
Container( // Your Tags )
Expanded(
child: GridView.count( // Your Grid)
]
)

Flutter ListView don't scroll on a page

I'm working in a restaurant delivery app, I purchase it in Codecanyon but the support is so bad... I discover a bug in a Cart Dart and the scroll don't work... I receive the "Bottom Overflow Error"
I try all Google tutorials but don't have idea what is bad.
This is my code:
#override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: Helper.of(context).onWillPop,
child: Scaffold(
key: _con.scaffoldKey,
bottomNavigationBar: CartBottomDetailsWidget(con: _con),
appBar: AppBar(
automaticallyImplyLeading: false,
leading: IconButton(
onPressed: () {
if (widget.routeArgument != null) {
Navigator.of(context).pushReplacementNamed(widget.routeArgument.param, arguments: RouteArgument(id: widget.routeArgument.id));
} else {
Navigator.of(context).pushReplacementNamed('/Pages', arguments: 2);
}
},
icon: Icon(Icons.arrow_back),
color: Theme.of(context).hintColor,
),
backgroundColor: Colors.transparent,
elevation: 0,
centerTitle: true,
title: Text(
S.of(context).cart,
style: Theme.of(context).textTheme.headline6.merge(TextStyle(letterSpacing: 1.3)),
),
),
body: RefreshIndicator(
onRefresh: _con.refreshCarts,
child: _con.carts.isEmpty
? EmptyCartWidget()
: Stack(
alignment: AlignmentDirectional.bottomCenter,
children: [
Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.only(left: 20, right: 10),
child: ListTile(
contentPadding: EdgeInsets.symmetric(vertical: 0),
leading: Icon(
Icons.shopping_cart,
color: Theme.of(context).hintColor,
),
title: Text(
S.of(context).shopping_cart,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.headline4,
),
subtitle: Text(
S.of(context).verify_your_quantity_and_click_checkout,
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: Theme.of(context).textTheme.caption,
),
),
),
ListView.separated(
padding: EdgeInsets.symmetric(vertical: 15),
scrollDirection: Axis.vertical,
shrinkWrap: true,
primary: true,
itemCount: _con.carts.length,
separatorBuilder: (context, index) {
return SizedBox(height: 15);
},
itemBuilder: (context, index) {
return CartItemWidget(
cart: _con.carts.elementAt(index),
heroTag: 'cart',
increment: () {
_con.incrementQuantity(_con.carts.elementAt(index));
},
decrement: () {
_con.decrementQuantity(_con.carts.elementAt(index));
},
onDismissed: () {
_con.removeFromCart(_con.carts.elementAt(index));
},
);
},
),`

Without trying this but perhaps put Expanded around the ListView
Being a direct child of a Column it does not know how big it should be.
Expanded(
child: ListView.separated(...)
)