I just started flutter. I tried to make a card structure but I think it is quite wrong. I could never fix it. I am using Gridview extend. In this way, the column numbers change dynamically as the screen gets smaller or larger. but i keep getting overflow error what should i do.
var response = sepet.itemsCount[item.name];
return SizedBox(
child: Padding(
padding: EdgeInsets.all(0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.all(Radius.circular(8.0))),
child: InkWell(
customBorder: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(8),
),
onTap: () {},
child: Column(
children: <Widget>[
ListTile(
title: Text(item.name ?? ''),
subtitle: Text(item.defaultPrice.toString() + '\$'),
),
Padding(
padding: EdgeInsets.all(8.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
countChanger(sepet, false, item),
Padding(
padding: EdgeInsets.only(left: 8.0, right: 8.0),
child: Text(
response != null ? response.toString() : '0',
style: TextStyle(fontSize: 18.0),
),
),
countChanger(sepet, true, item),
],
),
ButtonTheme(
height: 25,
minWidth: 25,
child: ElevatedButton(
onPressed: () {
!isAdded
? sepet.sepeteEkle(item)
: sepet.deleteItem(item);
},
style: ElevatedButton.styleFrom(
primary: !isAdded
? Colors.teal
: Colors.red,
),
child: Text(!isAdded ? 'Ekle' : 'Çıkar'),
),
),
],
),
)
],
),
),
),
],
),
),
);
My gridview extend structure is like this
child: GridView.extent(
physics: NeverScrollableScrollPhysics(),
shrinkWrap: true,
maxCrossAxisExtent: 250.0,
crossAxisSpacing: 20.0,
mainAxisSpacing: 20.0,
children: List.generate(foods!.length, (index) {
return itemCard(foods[index].menuItem ?? MenuItem(), value);
}),
The question you need to answer is what would you like to happen if the width of that card is so small? Do you want a different arrangement of those elements? If you do decide on what that would look like and check the constraint with LayoutBuilder Or the whole screen width with MediaQuery whatever you feel is best. You could also make that bit scroll horizontally by using SingleChildScrollView. This is a design decision. You must image what things look like when screen size changes, and be as deliberate as possible with the responsiveness rather then to just try to find some magic widget which we are all guilty of doing sometimes.
Try below code hope its helpful to you I have try similar to your code and add your widgets in Expanded or Flexible Widgets.
flexible widgets
expanded Widgets
GridView.builder(
padding: const EdgeInsets.all(8),
itemCount: 4,
itemBuilder: (ctx, i) {
return Container(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
child: Text('data'),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Expanded(
child: Container(
padding: const EdgeInsets.symmetric(horizontal: 5.0),
margin: EdgeInsets.all(10),
height: 35.0,
width: 100.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
border: Border.all(
color: Colors.grey,
),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
InkWell(
child: Icon(Icons.remove, color: Colors.green),
onTap: () {},
),
Spacer(),
Text(
'0',
style: Theme.of(context)
.textTheme
.subtitle2!
.copyWith(fontSize: 16.0),
),
Spacer(),
InkWell(
child: Icon(
Icons.add,
color: Colors.green,
),
onTap: () {},
),
],
),
),
),
Expanded(
child: ElevatedButton(
onPressed: () {},
child: Text(
'Sub Total',
style: TextStyle(
fontSize: 15,
),
),
),
),
],
),
],
),
);
},
gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
maxCrossAxisExtent: 170.0,
mainAxisExtent: 93,
),
),
Your Result screen like->
Related
i want to make an this function on the product but i don't know how to since I'm too fresh with flutter...
so here is the picture of how I want it to be
The Sample
and here is my codes.
child: GridTile(
footer: Container(
color: Colors.white,
child: Row(
children: [
Expanded(
flex: 8,
child: Text(product_name),
),
Text("\$$product_price",
style: const TextStyle(fontWeight: FontWeight.w600)),
TextButton(
onPressed: (){
debugPrint('added to cart');
},
child: Text("ADD TO CARD"),
style: TextButton.styleFrom(
primary: Colors.lightBlue[800],
shadowColor: Colors.deepPurple,
// elevation: 5,
),
),
],
),
),
child: Image.asset(
product_picture,
fit: BoxFit.cover,
),
),
),
),
),
and it is how it looks
How it looks
I will appreciate any help!
Here is something similar to the sample
GridView.count(
shrinkWrap: true,
childAspectRatio: .8,
crossAxisCount: 2,
mainAxisSpacing: 4,
crossAxisSpacing: 4,
children: List.generate(10, (index) {
return Container(
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(8),
),
child: Stack(
children: [
Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
ClipRRect(
borderRadius: BorderRadius.circular(5),
child: Image.network('https://i.ytimg.com/vi/6OovMIjDtAM/maxresdefault.jpg',)
),
const SizedBox(height: 14),
const Text('My Drink 101',
style: TextStyle(color: Colors.black, fontSize: 16, fontWeight: FontWeight.w600),
),
const SizedBox(height: 14),
Padding(
padding: const EdgeInsets.symmetric(horizontal: 8.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text('500 ml', style: TextStyle(color: Colors.black, fontSize: 14, fontWeight: FontWeight.w300)),
Text('\$500 ml', style: TextStyle(color: Colors.black, fontSize: 14, fontWeight: FontWeight.w300)),
],
),
),
const SizedBox(height: 16),
Container(
alignment: Alignment.centerRight,
child: InkWell(
onTap: () {
// add to cart
},
child: Icon(Icons.shopping_cart_outlined, color: Colors.blue,),
),
),
],
),
Align(
alignment: Alignment.topLeft,
child: InkWell(
onTap: () {
// add to favourite
},
child: const Padding(
padding: EdgeInsets.all(8.0),
child: Icon(
Icons.favorite_border,
color: Colors.white,
),
),
),
),
],
),
);
}),
)
Well, there is a bunch needed to make a card similar to the sample you provided. Take a look at this video to get some ideas. I would recommend you to read the flutter widgets documentation for a better understanding of how each property work.
This channel also has a lot of great flutter UI content that is worthy to have a look at.
To start I would consider using a Card instead of a Container
I am trying to create social login buttons like below image. I want to align textbutton icon and name to left. also center the row they are in so that the icon and text align vertically when using multiple text buttons.
expected result:
My Result:
My Code for button:
TextButton(
onPressed: onTap,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Align(
alignment: Alignment.centerLeft,
child: Container(
margin: const EdgeInsets.symmetric(horizontal: 20),
width: 30,
child: Image.asset(
icon,
fit: BoxFit.cover,
),
),
),
Align(
alignment: Alignment.centerLeft,
child: Text(
buttonName,
style: kBodyText2,
textAlign: TextAlign.left,
),
),
],
),
style: TextButton.styleFrom(
backgroundColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(SizeConfig.blockSizeH! * 3),
),
),
),
You should use ListTile()
instead.
Set title: "Continue with Google".
And leading: you can set the logo.
The positions will always stay the same no matter how long your title will be, you also have extra options like subtitles and trailing actions.
To make it act like a button use
onTap: (){}
You can achieve that by using the Expanded widget: Like so:
Padding(
padding: const EdgeInsets.all(8.0),
child: TextButton(
onPressed: (){},
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
flex: 1,
child: Container(),),
Expanded(
flex: 2,
child: Align(
alignment: Alignment.centerLeft,
child: Container(
margin: const EdgeInsets.symmetric(horizontal: 20),
width: 30,
child: Icon(Icons.access_alarm),
),
),
),
Expanded(
flex: 5,
child: Align(
alignment: Alignment.centerLeft,
child: Text(
'test text test',
textAlign: TextAlign.left,
),
),
),
],
),
style: TextButton.styleFrom(
backgroundColor: Colors.grey,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10),
),
),
),
),
const SizedBox(height: 30),
Padding(
padding: const EdgeInsets.all(8.0),
child: TextButton(
onPressed: (){},
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(flex: 1, child: Container(),),
Expanded(
flex: 2,
child: Align(
alignment: Alignment.centerLeft,
child: Container(
margin: const EdgeInsets.symmetric(horizontal: 20),
width: 30,
child: Icon(Icons.access_alarm),
),
),
),
Expanded(
flex: 5,
child: Align(
alignment: Alignment.centerLeft,
child: Text(
'test text test test',
textAlign: TextAlign.left,
),
),
),
],
),
style: TextButton.styleFrom(
backgroundColor: Colors.grey,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10),
),
),
),
),
You can exploit the fact the these icons are the same size, to easily align them. Each of your TextButton already holds a Row, but instead of fancy layout stuff, you can just insert padding to the Icon by adding blank spaces using SizedBox, like so:
TextButton(
child: Row(
children: [
const SizedBox(width: 16), // padding in the beginning
Icon(Icons.download), // the icon, or image, or whatever
const SizedBox(width: 16), // padding in-between
Text('Button ' * i), // the text
],
),
onPressed: () {},
)
Result:
Code used to produce the above demo:
Column(
mainAxisSize: MainAxisSize.min,
children: [
for (int i = 1; i < 6; i++)
TextButton(
child: Row(
children: [
const SizedBox(width: 16),
Icon(Icons.download),
const SizedBox(width: 16),
Text('Button ' * i),
],
),
onPressed: () {},
style: TextButton.styleFrom(
backgroundColor: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(16),
),
),
),
],
)
I'm new to Flutter and have been trying to clone a screen that requires a scroll architecture.Here is the link of the screen that i'm working on. https://i.stack.imgur.com/1OW2b.pngThe code is as below.PS: Ignore the fields that are incomplete. As soon as I get the scroll view, i'll add the functionalities afterwards.
Scaffold(
body: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(15.0, 40.0, 15.0, 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: const <Widget>[
Icon(Icons.menu),
Image(), //Asset image
],
),
Row(
children: <Widget>[
const Icon(Icons.notifications_none),
const SizedBox(width: 27.0),
CircleAvatar(
child: Text("JM"),
),
],
)
],
),
Row(
children: const <Widget>[
Icon(Icons.arrow_back),
SizedBox(width: 20.0),
Text("Public page"),
],
),
const SizedBox(
height: 20.0,
),
const Text(" Please fill the form following the proper order."),
const SizedBox(height: 10.0),
OverviewWidget(), //Widget with lots of TextFormField
SizedBox(height: 10.0),
DescriptionWidget(), //Widget with lots of TextFormField
],
),
),
Align([enter image description here][1]
alignment: Alignment.bottomCenter,
child: GestureDetector(
onTap: () {
print("Hello");
},
child: Container(
height: 130.0,
width: double.infinity,
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.grey.shade400,
blurRadius: 10,
spreadRadius: 1,
)
],
),
child: Container(
margin: const EdgeInsets.only(top: 10.0, bottom: 30.0),
decoration: BoxDecoration(
color: Colors.green.shade400,
borderRadius: BorderRadius.circular(35),
),
child: const Padding(
padding: EdgeInsets.symmetric(
vertical: 15.0,
horizontal: 150.0,
),
child: Text(
"Save",
style: TextStyle(
color: Colors.white,
fontSize: 17,
fontWeight: FontWeight.w600),
),
),
),
),
),
),
],
),
);
So far, i've only created the Overview and Description widgets and i'm already getting RenderFlex overflow error. I tried wrapping the very first Column widget with a SingleChildScrollView widget but it can be noticed that the Save button at the bottom should stay fixed. I tried wrapping the whole widget with Stack widget instead of a Column widget but it didn't help either. I also used ListView widget but got the same results.What shall I do to achieve this view?
I guess you had all the elements but did not quite manage to use them as needed.
Your screen is composed of two important layout:
A stack (containing a button on top of a scrollable widget)
The scrollable widget
The stack has to be a stack, the scrollable can be anything but in your case SingleChildScrollView+Column seems the best choice.
Here is the concrete implementation:
Scaffold(
body: Stack(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(15.0, 40.0, 15.0, 0),
child: SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.only(bottom: 100.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Icon(Icons.menu),
Container(
height: 100,
width: 100,
color: Colors.redAccent,
),
//Asset image
],
),
Row(
children: <Widget>[
const Icon(Icons.notifications_none),
const SizedBox(width: 27.0),
CircleAvatar(
child: Text("JM"),
),
],
)
],
),
Row(
children: const <Widget>[
Icon(Icons.arrow_back),
SizedBox(width: 20.0),
Text("Public page"),
],
),
const SizedBox(
height: 20.0,
),
const Text(" Please fill the form following the proper order."),
const SizedBox(height: 10.0),
Container(
height: 400,
color: Colors.blueAccent,
), //Widget with lots of TextFormField
SizedBox(height: 10.0),
Container(
height: 400,
color: Colors.greenAccent,
), //Widget with lots of TextFormField
],
),
),
),
),
Align(
alignment: Alignment.bottomCenter,
child: GestureDetector(
onTap: () {
print("Hello");
},
child: Container(
height: 130.0,
width: double.infinity,
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.grey.shade400,
blurRadius: 10,
spreadRadius: 1,
)
],
),
child: Container(
margin: const EdgeInsets.only(top: 10.0, bottom: 30.0),
decoration: BoxDecoration(
color: Colors.green.shade400,
borderRadius: BorderRadius.circular(35),
),
child: const Padding(
padding: EdgeInsets.symmetric(
vertical: 15.0,
horizontal: 150.0,
),
child: Text(
"Save",
style: TextStyle(
color: Colors.white, fontSize: 17, fontWeight: FontWeight.w600),
),
),
),
),
),
),
],
),
)
Note that you have to put a bottom padding inside the SingleChildScrollView to take into account the button. This is fine in your case since the button has a static height. However if you need something more fancy you might want to check How to create a scroll view with fixed footer with Flutter? as #Csisanyi suggested
Consider wrapping the Column with an Expanded widget
You can also check out this flutter doc. It addresses this common issue in detail.
https://flutter.dev/docs/testing/common-errors
Scaffold(
body: SingleChildScrollView(
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(15.0, 40.0, 15.0, 0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Icon(Icons.menu),
// Image(), //Asset image
Image.asset(
'assets/ocean.jpg',
height: kToolbarHeight,
/// make sure of image height
fit: BoxFit.fitHeight,
),
],
),
Row(
children: <Widget>[
const Icon(Icons.notifications_none),
const SizedBox(width: 27.0),
CircleAvatar(
child: Text("JM"),
),
],
)
],
),
Row(
children: const <Widget>[
Icon(Icons.arrow_back),
SizedBox(width: 20.0),
Text("Public page"),
],
),
const SizedBox(
height: 20.0,
),
const Text(
" Please fill the form following the proper order."),
const SizedBox(height: 10.0),
//todo: OverviewWidget(), //Widget with lots of TextFormField
...List.generate(22, (index) {
return TextField(
decoration: InputDecoration(hintText: "1st $index"),
);
}),
SizedBox(height: 10.0),
//todo: DescriptionWidget(), //Widget with lots of TextFormField
...List.generate(22, (index) {
return TextField(
decoration: InputDecoration(hintText: "2st $index"),
);
}),
],
),
),
Align(
alignment: Alignment.bottomCenter,
child: GestureDetector(
onTap: () {
print("Hello");
},
child: Container(
height: 130.0,
width: double.infinity,
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.white,
boxShadow: [
BoxShadow(
color: Colors.grey.shade400,
blurRadius: 10,
spreadRadius: 1,
)
],
),
child: Container(
margin: const EdgeInsets.only(top: 10.0, bottom: 30.0),
decoration: BoxDecoration(
color: Colors.green.shade400,
borderRadius: BorderRadius.circular(35),
),
child: const Padding(
padding: EdgeInsets.symmetric(
vertical: 15.0,
horizontal: 150.0,
),
child: Text(
"Save",
style: TextStyle(
color: Colors.white,
fontSize: 17,
fontWeight: FontWeight.w600),
),
),
),
),
),
),
],
),
),
),
I have a ListView and I want to display the items in my custom list tile, the problem is that my text oveflow the tile, i want to add TextOverflow.ellipsis but it doesn't work.
Here's my code:
return Expanded(
child: ListView.builder(
itemCount: songss.length,
itemBuilder: (context, index) {
Song song = songss[index];
return Container(
decoration: BoxDecoration(
border: Border(bottom: BorderSide(color: kPrimaryColor))),
margin: const EdgeInsets.only(left: 16.0),
child: InkWell(
child: Column(
children: <Widget>[
SizedBox(height: 12.0),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
children: <Widget>[
Text("${index + 1}",
style: Theme.of(context).textTheme.subtitle2),
SizedBox(width: 16.0),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
song.title,
style: Theme.of(context).textTheme.subtitle1,
overflow: TextOverflow.ellipsis, //Here i want to handle overflow
),
Text(_getSongDuration(song.duration),
style: Theme.of(context).textTheme.subtitle2),
],
),
],
),
Padding(
padding: const EdgeInsets.only(right: 20.0),
child: Row(
children: <Widget>[
IconButton(
onPressed: () => null,
icon: Icon(Icons.favorite_border),
),
GestureDetector(
onTapDown: (TapDownDetails details) =>
null,
child: Icon(Icons.more_horiz),
),
],
),
)
],
),
SizedBox(height: 12.0),
],
),
),
);
},
),
);
I tried using expanded and flex but it gives me error.
Do you know how to solve it?
Give height,width to the Parent Widget of Text widget and then wrap Text with Expanded
Your error will be solved as expanded/flex need some max parent size to take space from.
I've actualy managed to solve the problem.
return Expanded(
child: ListView.builder(
itemCount: songss.length,
itemBuilder: (context, index) {
Song song = songss[index];
return Container(
decoration: BoxDecoration(
border: Border(bottom: BorderSide(color: kPrimaryColor))),
margin: const EdgeInsets.only(left: 16.0),
child: InkWell(
child: Row(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Text("${index + 1}",
style: Theme.of(context).textTheme.subtitle2),
SizedBox(width: 16.0),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
song.title,
style: Theme.of(context).textTheme.subtitle1,
overflow: TextOverflow.ellipsis,
),
Text(_getSongDuration(song.duration),
style: Theme.of(context).textTheme.subtitle2),
],
),
),
IconButton(
onPressed: () => null,
icon: Icon(Icons.favorite_border),
),
GestureDetector(
onTapDown: (TapDownDetails details) => null,
child: Icon(Icons.more_horiz),
),
],
),
),
);
},
),
);
I've just rewrote the whole list, removing one or two rows.
So i'm gonna answer the question, thank you for your help tho.
I am trying to display Listview using Listview builder below the purple color(as seen in the image)container with the below code:
return Scaffold(
body: Column(
children: <Widget>[
Container(
height: 300,
decoration: BoxDecoration(
color: Colors.deepPurple,
borderRadius: BorderRadius.only(bottomLeft: Radius.circular(75.0)),
),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(0, 10, 200, 0),
child: Container(
padding: EdgeInsets.fromLTRB(0, 30,200,0),
child: IconButton(icon: Icon(Icons.arrow_back,),
color: Colors.black,
onPressed: () {
Navigator.pop(context);
},
),
),
),
SizedBox(height: 20,),
Text('Semester 1',
style: TextStyle(color: Colors.white,
fontSize: 30),
)
],
)
),
Container(
child: ListView.builder(
itemCount: 1,
itemBuilder: (BuildContext context, int index) {
return new Container(
child: new Center(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new Card(
child: new Container(
child: new Text("hello"),
padding: const EdgeInsets.all(20),
))
],
)));
}),
)
],
),
);
It returns a blank screen after running the code,without showing any error. I am not able to figure out the problem.
Please help!
If you use listview is small and inside Column then you should add
shrinkWrap: true in ListView
Column(
children: <Widget>[
ListView(
shrinkWrap: true, // use it
)
],
)
Or If your ListView Height is fix then use
Column(
children: <Widget>[
SizedBox(
height: 200, // constrain height
child: ListView(),
)
],
)
or If you want to fill all remaining space the use
Column(
children: <Widget>[
Expanded(
child: ListView(...),
)
],
)
Simply wrap the ListView in Expanded. The error here is that ListView doesn't know how to size itself (it has unbounded height from the Column). Using Expanded will tell it to fill up all the remaining space and fix the sizing problem
return Scaffold(
body: Column(
children: <Widget>[
Container(
height: 300,
decoration: BoxDecoration(
color: Colors.deepPurple,
borderRadius: BorderRadius.only(bottomLeft: Radius.circular(75.0)),
),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(0, 10, 200, 0),
child: Container(
padding: EdgeInsets.fromLTRB(0, 30,200,0),
child: IconButton(icon: Icon(Icons.arrow_back,),
color: Colors.black,
onPressed: () {
Navigator.pop(context);
},
),
),
),
SizedBox(height: 20,),
Text('Semester 1',
style: TextStyle(color: Colors.white,
fontSize: 30),
)
],
)
),
Container(
child: Expanded( // <-- wrap with expanded
child: ListView.builder(
itemCount: 1,
itemBuilder: (BuildContext context, int index) {
return new Container(
child: new Center(
child: new Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
new Card(
child: new Container(
child: new Text("hello"),
padding: const EdgeInsets.all(20),
))
],
)));
}),
),
)
],
),
);
Error is caused by Container that is wrapping ListView. You need to specify bounds for that Container.
return Scaffold(
body: Column(
children: <Widget>[
Container(
height: 300,
decoration: BoxDecoration(
color: Colors.deepPurple,
borderRadius:
BorderRadius.only(bottomLeft: Radius.circular(75.0)),
),
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.fromLTRB(0, 10, 200, 0),
child: Container(
padding: EdgeInsets.fromLTRB(0, 30, 200, 0),
child: IconButton(
icon: Icon(
Icons.arrow_back,
),
color: Colors.black,
onPressed: () {
Navigator.pop(context);
},
),
),
),
SizedBox(
height: 20,
),
Text(
'Semester 1',
style: TextStyle(color: Colors.white, fontSize: 30),
)
],
),
),
Container(
height: 300,
child: ListView.builder(
itemCount: 1,
itemBuilder: (BuildContext context, int index) {
return Container(
child: Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: <Widget>[
Card(
child: Container(
child: Text("hello"),
padding: const EdgeInsets.all(20),
))
],
)));
}),
)
],
),
Above code should be working. Please note that, you don't need to specify "new" keyword in flutter.