GridView.Count is not visible without fixing the height of parent container

GridView.Count is not visible without fixing the height of parent container - android

I am new to flutter so I am unable to found the problem in this code. All things are working fine but I am trying to use Grid list with two rows which are working fine when I am giving height to the parent container of the list but I want to wrap the Height according to items.
void main() {
runApp(new MaterialApp(
home: new MyHome(),
));
}
class MyHome extends StatefulWidget {
#override
_AppState createState() => _AppState();
}
TextEditingController controller = new TextEditingController();
class _AppState extends State<MyHome> {
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
#override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
appBar: PreferredSize(
preferredSize: Size(null, 180),
child: CustomAppBar(_scaffoldKey, controller),
),
drawer: createDrawer(),
body: SingleChildScrollView(
child: Container(
color: Colors.black12,
//=========Main Container For Scrollview==============//
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 15, 0, 0),
child: Column(
children: <Widget>[
Container(
//================Container for Categories==================//
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(15, 10, 15, 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
],
),
),
),
Card(
child: SizedBox(
height: 200.0,
child: Carousel(
images: [
NetworkImage(
'https://cdn-images-1.medium.com/max/2000/1*GqdzzfB_BHorv7V2NV7Jgg.jpeg'),
NetworkImage(
'https://cdn-images-1.medium.com/max/2000/1*wnIEgP1gNMrK5gZU7QS0-A.jpeg'),
],
dotSize: 4.0,
dotSpacing: 15.0,
indicatorBgPadding: 5.0,
borderRadius: false,
)),
),
//======================Here is the Problem===========//
GridView.count(
childAspectRatio: 4.0,
// Create a grid with 2 columns. If you change the scrollDirection to
// horizontal, this produces 2 rows.
crossAxisCount: 2,
// Generate 100 widgets that display their index in the List.
children: List.generate(100, (index) {
return Center(
child: Text(
'Item $index',
style: Theme.of(context).textTheme.headline,
),
);
}),
)
],
),
),
),
),
);
}
}

Since you're using SingleChildScrollView as a parent widget for your GridView, so you need to specify primary: false and shrinkWrap: true so GridView takes the least height based on the item counts.
Complete code:
void main() {
runApp(new MaterialApp(
home: new MyHome(),
));
}
class MyHome extends StatefulWidget {
#override
_AppState createState() => _AppState();
}
TextEditingController controller = new TextEditingController();
class _AppState extends State<MyHome> {
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
#override
Widget build(BuildContext context) {
return Scaffold(
key: _scaffoldKey,
appBar: PreferredSize(
preferredSize: Size(null, 180),
child: CustomAppBar(_scaffoldKey, controller),
),
drawer: createDrawer(),
body: SingleChildScrollView(
child: Container(
color: Colors.black12,
//=========Main Container For Scrollview==============//
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 15, 0, 0),
child: Column(
children: <Widget>[
Container(
//================Container for Categories==================//
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(15, 10, 15, 10),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
Column(
children: <Widget>[
CircleAvatar(
backgroundImage:
ExactAssetImage('images/user_icon.png'),
minRadius: 20,
maxRadius: 30,
),
Text(
'Women',
style: TextStyle(
fontSize: 13,
color: Colors.black,
fontFamily: 'SFProRegular'),
)
],
),
],
),
),
),
Card(
child: SizedBox(
height: 200.0,
child: Carousel(
images: [
NetworkImage(
'https://cdn-images-1.medium.com/max/2000/1*GqdzzfB_BHorv7V2NV7Jgg.jpeg'),
NetworkImage(
'https://cdn-images-1.medium.com/max/2000/1*wnIEgP1gNMrK5gZU7QS0-A.jpeg'),
],
dotSize: 4.0,
dotSpacing: 15.0,
indicatorBgPadding: 5.0,
borderRadius: false,
)),
),
GridView.count(
shrinkWrap: true,
primary: false,
childAspectRatio: 4.0,
// Create a grid with 2 columns. If you change the scrollDirection to
// horizontal, this produces 2 rows.
crossAxisCount: 2,
// Generate 100 widgets that display their index in the List.
children: List.generate(100, (index) {
return Center(
child: Text(
'Item $index',
style: Theme.of(context).textTheme.headline,
),
);
}),
)
],
),
),
),
),
);
}
}

Related

How to remove Unnecessary Blank space above Stack-Pageview inside Scaffold in Flutter?

I'm making an on-boarding screen. Everything is working as expected but there is some space above the image as can be seen in the provided image which shouldn't be there. I tried using MediaQuery.removePadding but that didn't help.
Please look at the code and if you can suggest anything please do. I had the same problem in another project in which I'm using Scaffold->Column->Expanded...., I'm hoping the solution for both would be similar.
class OnBoardingScreen extends StatefulWidget {
const OnBoardingScreen({Key? key}) : super(key: key);
static const String id = 'onboard-screen';
#override
State<OnBoardingScreen> createState() => _OnBoardingScreenState();
}
class _OnBoardingScreenState extends State<OnBoardingScreen> {
int _pages = 0;
final _controller = PageController();
final store = GetStorage();
onButtonPressed(context) {
store.write('onBoarding', true);
return Navigator.pushReplacementNamed(context, MainScreen.id);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
child: Stack(
children: [
PageView(
padEnds: false,
controller: _controller,
onPageChanged: ((val) {
setState(() {
_pages = val.toInt();
});
}),
children: [
OnBoardPage(
boardColumn: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(
child: Image.asset(
'assets/images/1.png',
fit: BoxFit.fill,
),
),
const Padding(
padding: EdgeInsets.only(left: 16.0, bottom: 10),
child: Text(
'Welcome\nto Fiesto',
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 44,
color: Colors.white),
),
),
const Padding(
padding: EdgeInsets.only(left: 16.0),
child: Text(
'Book restaurants, cafes,\nbanquet halls, marriage halls, etc',
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.normal,
fontSize: 22,
color: Colors.white),
),
),
],
),
),
OnBoardPage(
boardColumn: Column(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
SizedBox(
child: Image.asset(
'assets/images/2.png',
),
),
const Padding(
padding: EdgeInsets.only(left: 16.0, bottom: 10),
child: Text(
'Fiesto\nParty Services',
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 44,
color: Colors.white),
),
),
const Padding(
padding: EdgeInsets.only(left: 16.0),
child: Text(
'Get all kinds of party services and\nsolutions',
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.normal,
fontSize: 22,
color: Colors.white),
),
),
],
),
),
Positioned.fill(
bottom: 180,
child: Align(
alignment: Alignment.bottomCenter,
child: Row(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
AnimatedSmoothIndicator(
//https://pub.dev/smooth_page_indicator
activeIndex: _pages,
count: 5,
effect: const JumpingDotEffect(
dotHeight: 16,
dotWidth: 16,
jumpScale: .7,
verticalOffset: 15,
dotColor: Colors.grey,
activeDotColor: Colors.yellow,
),
),
],
),
),
),
Positioned(
right: 16,
bottom: 120,
child: TextButton(
child: const Text(
'Skip & Proceed to\nLogin/Signup',
textAlign: TextAlign.end,
style: TextStyle(
color: Color.fromARGB(255, 117, 13, 13),
fontSize: 14,
decoration: TextDecoration.underline,
),
),
onPressed: () {
onButtonPressed(context);
},
),
),
Positioned(
right: 16,
bottom: 50,
width: 150,
height: 50,
child: ElevatedButton(
onPressed: () {
if (_pages == 0) {
_controller.animateToPage(
1,
duration: const Duration(milliseconds: 400),
curve: Curves.easeInOut,
);
} else if (_pages == 1) {
_controller.animateToPage(
2,
duration: const Duration(milliseconds: 400),
curve: Curves.easeInOut,
);
} else if (_pages == 2) {
_controller.animateToPage(
3,
duration: const Duration(milliseconds: 400),
curve: Curves.easeInOut,
);
} else if (_pages == 3) {
_controller.animateToPage(
4,
duration: const Duration(milliseconds: 400),
curve: Curves.easeInOut,
);
} else if (_pages == 4) {
onButtonPressed(context);
}
},
child: _pages <= 3
? const Text(
'Next',
style: TextStyle(fontSize: 22),
)
: const Text(
'Login/Signup',
style: TextStyle(fontSize: 22),
),
),
),
],
),
),
);
}
}
class OnBoardPage extends StatelessWidget {
final Column? boardColumn;
const OnBoardPage({Key? key, this.boardColumn}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
color: Color.fromARGB(255, 0, 0, 0),
child: boardColumn,
);
}
}

You have this problem because the Column widgets have a default mainAxisAlignment: MainAxisAlignment.center so I am changing it to: mainAxisAlignment: MainAxisAlignment.startAlso my tests on your code indicate the nature of the image is playing a role. Because its works like you want on my images.

Remove SafeArea or assign top: false.

Cannot Scroll ListView inside FutureBuilder

I have tried almost all the solution on stackoverflow like using Expanded widget with single child scroll view and physics property and what not but still cannot enable scroll inside futurebuilder which occupy second half of my screen, the first half is static but second half contains listview inside future builder but it's not scrollable !!
The Error is Bottom Overflowed by 1313 pixels
This Is My Code
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
resizeToAvoidBottomInset: true,
body:Container(
child: Column(
children: [
Column(
children: [
Padding(
padding: const EdgeInsets.fromLTRB(15,12,15,0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Image.asset('assets/hamburger.png',height: 25,width: 25,alignment: Alignment.topLeft,),
Image.asset('assets/log.png',height: 37,width: 37,alignment: Alignment.center,),
Image.asset('assets/searc.png',height: 25,width: 25,alignment: Alignment.topRight,),
],
),
),
SizedBox(height: 10,),
Padding(
padding: const EdgeInsets.fromLTRB(15, 0, 0, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
CircleAvatar(
radius: 30,
backgroundImage: NetworkImage(img)
),
// split(data[index]["image"])
SizedBox(width: 20,),
Column(
crossAxisAlignment: CrossAxisAlignment.start,
// mainAxisAlignment: MainAxisAlignment.center,
children: [
Row(
children: [
Text('Hello',style: TextStyle(
color: Colors.black,
fontSize: 15,
),textAlign: TextAlign.start,),
SizedBox(width: 5,),
Text(name,style: TextStyle(
color: Colors.black,
fontSize: 15,
fontWeight: FontWeight.bold
),textAlign: TextAlign.start,),
],
),
Text('Welcome To Quad Life',style: TextStyle(
color: Colors.grey,
fontSize: 13,
),textAlign: TextAlign.start,),
],
),
],
),
),
SizedBox(height: 10,),
Padding(
padding: const EdgeInsets.fromLTRB(15, 0, 15, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
SizedBox(
width:MediaQuery.of(context).size.width*0.4,
height: 70,
child: Card(
elevation: 5,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15),
) ,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 5),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(data.length.toString(),
style:
TextStyle(color: Colors.black,
fontSize: 15,
fontWeight: FontWeight.bold),),
SizedBox(height: 5,),
Text('Operators',style:
TextStyle(color: Colors.grey,
fontSize: 15,
fontWeight: FontWeight.bold),),
],
),
),
),
),
SizedBox(
width:MediaQuery.of(context).size.width*0.4,
height: 70,
child: Card(
elevation: 5,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15),
) ,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 5),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(data1.length.toString(),style:
TextStyle(color: Colors.black,
fontSize: 15,
fontWeight: FontWeight.bold),),
SizedBox(height: 5,),
Text('Supervisors',style:
TextStyle(color: Colors.grey,
fontSize: 15,
fontWeight: FontWeight.bold),),
],
),
),
),
),
],
),
),
Column(
children: [
Padding(
padding: const EdgeInsets.fromLTRB(0, 15, 0, 0),
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 15),
child: Card(
elevation: 20,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15),
) ,
child: SizedBox(
width: MediaQuery.of(context).size.width,
height: 150,
child: LineChart(
LineChartData(
borderData: FlBorderData(
show: true,
border: Border.all(width: 0)
),
gridData: FlGridData(
show: false,
),
titlesData: FlTitlesData(
show: false,
bottomTitles: SideTitles(
showTitles: true,
)
),
maxX: 50,
maxY: 100,
minX: 0,
minY: 0,
lineBarsData: [
LineChartBarData(
spots: [
FlSpot(0, 50),
FlSpot(10, 60),
FlSpot(15, 55),
FlSpot(20, 60),
FlSpot(30, 70),
FlSpot(40, 65),
FlSpot(50, 90),
],
isCurved: true,
colors: [Colors.orange,Colors.orangeAccent.shade700],
barWidth: 5,
belowBarData: BarAreaData(
show: true,
colors: gradientcolors.map((e) => e.withOpacity(0.3)).toList()
)
),
],
)
),
),
),
),
),
SizedBox(height: 10,),
Padding(
padding: const EdgeInsets.fromLTRB(15, 0, 15, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
SizedBox(
width:MediaQuery.of(context).size.width*0.45,
height: 70,
child: Card(
elevation: 3,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
) ,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 5),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('New Operator',style:
TextStyle(color: Colors.black,
fontSize: 14,),),
SizedBox(height: 5,),
Text('Register new verfied Operator',
textAlign: TextAlign.center,
style:
TextStyle(color: Colors.grey,
fontSize: 9,
fontWeight: FontWeight.bold),),
],
),
),
),
),
SizedBox(
width:MediaQuery.of(context).size.width*0.45,
height: 70,
child: Card(
elevation: 3,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(7),
) ,
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 5),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('New Supervisors',style:
TextStyle(color: Colors.black,
fontSize: 14,),),
SizedBox(height: 5,),
Text('Register new verfied Supervisors',
textAlign: TextAlign.center,
style:
TextStyle(color: Colors.grey,
fontSize: 9,
fontWeight: FontWeight.bold),),
],
),
),
),
),
],
),
),
],
),
SizedBox(height: 5,),
Padding(
padding: EdgeInsets.fromLTRB(15, 0, 0, 0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Text('Verify Operators',style: TextStyle(
color: Colors.grey.shade500,
fontSize: 15,
fontWeight: FontWeight.bold,
),
),
],
),
),
],
),
FutureBuilder(
builder: (context, snapshot){
if(snapshot != null){
return Column(
children: [
ListView.builder(
scrollDirection: Axis.vertical,
physics:NeverScrollableScrollPhysics(),
shrinkWrap: true,
// builder: (BuildContext context, int index) {
// return SizedBox(height: 0);
// },
itemCount: data == null ? 0 :data.length ,
itemBuilder: (context, index){
return InkWell(
onTap: (){},
child: Padding(
padding: const EdgeInsets.all(0),
child: Container(
height: MediaQuery.of(context).size.height*0.1,
decoration: BoxDecoration(
borderRadius: BorderRadius.all(Radius.circular(20)),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Container(
margin: EdgeInsets.only(left: 15),
child: SizedBox(
height: 50,
width: 50,
child: ClipRRect(
borderRadius: BorderRadius.circular(15),
child: Image(
image: NetworkImage(split(data[index]["image"])),
),
),
),
),
SizedBox(width: 10,),
Padding(
padding: const EdgeInsets.only(top: 25),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(data[index]["fullName"],
textAlign: TextAlign.left,
style: TextStyle(
fontSize: 15,
color: Colors.black,
fontWeight: FontWeight.bold,
),),
Text(capitalize(data[index]["experience"][data[index]["experience"].length-1]['designation']),
textAlign: TextAlign.left,
style: TextStyle(
fontSize: 15,
color: Colors.grey,
fontWeight: FontWeight.w100
),),
],
),
),
],
),
Padding(
padding: const EdgeInsets.only(right: 20),
child: TextButton(onPressed: (){},
child: Text('Verify Now',style:
TextStyle(color: Colors.green,fontWeight: FontWeight.bold,
fontSize: 15),),),
)
],
),
),
),
);
},
),
],
);
}else{
return CircularProgressIndicator();
}
},
),
],
),
),
),
);
}

=>Change Second half with this
Expanded(
flex: 1,
child: FutureBuilder(
builder: (context, snapshot) {
if (snapshot != null) {
return ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
// builder: (BuildContext context, int index) {
// return SizedBox(height: 0);
// },
itemCount: data == null ? 0 : data.length,
itemBuilder: (context, index) {
return InkWell(
onTap: () {},
child: Padding(
padding: const EdgeInsets.all(0),
child: Container(
height:
MediaQuery.of(context).size.height * 0.1,
decoration: BoxDecoration(
borderRadius:
BorderRadius.all(Radius.circular(20)),
),
child: Row(
mainAxisAlignment:
MainAxisAlignment.spaceBetween,
children: [
Row(
mainAxisAlignment:
MainAxisAlignment.start,
children: [
Container(
margin: EdgeInsets.only(left: 15),
child: SizedBox(
height: 50,
width: 50,
child: ClipRRect(
borderRadius:
BorderRadius.circular(15),
child: Image(
image: NetworkImage(split(
data[index]["image"])),
),
),
),
),
SizedBox(
width: 10,
),
Padding(
padding:
const EdgeInsets.only(top: 25),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
Text(
data[index]["fullName"],
textAlign: TextAlign.left,
style: TextStyle(
fontSize: 15,
color: Colors.black,
fontWeight: FontWeight.bold,
),
),
Text(
capitalize(data[index]
["experience"][data[index]
["experience"]
.length -
1]['designation']),
textAlign: TextAlign.left,
style: TextStyle(
fontSize: 15,
color: Colors.grey,
fontWeight:
FontWeight.w100),
),
],
),
),
],
),
Padding(
padding: const EdgeInsets.only(right: 20),
child: TextButton(
onPressed: () {},
child: Text(
'Verify Now',
style: TextStyle(
color: Colors.green,
fontWeight: FontWeight.bold,
fontSize: 15),
),
),
)
],
),
),
));
});
} else {
return CircularProgressIndicator();
}
},
),
),

Try below format hope its helpful to you. Wrap your FutureBuilder inside Expanded or Flexible
body: Column(
children: [
Container(),
Expanded(
child: FutureBuilder(
future: yourFutureCall();
builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
return ListView.builder(
shrinkWrap: true,
physics:
const NeverScrollableScrollPhysics(), //OR use -> const ClampingScrollPhysics(),
itemBuilder: (BuildContext context, int index) {
return Container();
},
);
},
),
),
],
),

I'm not sure , cause I could not run the code , but What I see is the unbounded widgets from lack of the specified width and height which is a common mistake in flutter world .
if #Jasmin Sojitra's answer does not work try putting height and width of full screen on the first Container , If still there is a problemt put child of the Container inside a SingleChildScrollView .

A value of type 'Object?' can't be assigned to a variable of type 'SinginCharacter' [closed]

Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 12 months ago.
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import 'package:flutter/material.dart';
import 'package:foodcorner/color/colors.dart';
enum SinginCharacter {fill,outline}
class ProductDetails extends StatefulWidget {
const ProductDetails({Key? key}) : super(key: key);
#override
_ProductDetailsState createState() => _ProductDetailsState();
}
class _ProductDetailsState extends State<ProductDetails> {
SinginCharacter _character = SinginCharacter.fill;
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
iconTheme: IconThemeData(color: textColor),
title: Text(
'Product Details',
style: TextStyle(color: textColor),
),
backgroundColor: primaryColor,
),
bottomNavigationBar: Row(children: [
Expanded(
child: Material(
color: Colors.deepOrangeAccent,
child: InkWell(
onTap: () {
//print('called on tap');
},
child: SizedBox(
height: kToolbarHeight,
width: double.infinity,
child: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.favorite_border_outlined),
SizedBox(
width: 5,
),
Text(
'Add To WishList',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
],
),
),
),
),
),
),
Expanded(
child: Material(
color: Colors.amberAccent,
child: InkWell(
onTap: () {
//print('called on tap');
},
child: SizedBox(
height: kToolbarHeight,
width: double.infinity,
child: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.shop_outlined),
SizedBox(
width: 5,
),
Text(
'Add To Cart',
style: TextStyle(
fontWeight: FontWeight.bold,
),
),
],
),
),
),
),
),
)
]),
body: Column(
children: [
Expanded(
flex: 2,
child: Container(
width: double.infinity,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.only(top: 20, left: 15),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'fresh Basil',
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 25),
),
SizedBox(
height: 10,
),
Text(
'\ 50Tak',
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 25),
),
],
),
),
Container(
height: 250,
margin: EdgeInsets.all(40),
child: Center(
child: Image.network(
'http://assets.stickpng.com/images/58bf1e2ae443f41d77c734ab.png'),
)),
Padding(
padding: const EdgeInsets.only(left: 15),
child: Container(
width: double.infinity,
child: Text(
'Available Option',
style: TextStyle(
fontWeight: FontWeight.w600, fontSize: 20),
),
),
),
Padding(
padding: EdgeInsets.symmetric(horizontal: 10),
child: Row(
children: [
Row(
children: [
CircleAvatar(
radius: 3,
backgroundColor: Colors.green[700],
),
//A value of type 'Object?' can't be assigned to a variable of type 'SinginCharacter'.
Radio(
activeColor: Colors.green[700],
value: SinginCharacter.fill,
groupValue: _character,
onChanged: (value){
setState(() {
_character=value;
});
},
)
],
)
],
),
)
],
),
),
)
],
),
);
}
}

You're missing the type on the Radio widget, as in Radio< SinginCharacter>, as in:
Radio<SinginCharacter>(
activeColor: Colors.green[700],
value: SinginCharacter.fill,
groupValue: _character,
onChanged: (value){
setState(() {
_character=value;
});
},
)

Can we group or filter data inside our hive boxes

I use hive to store my data locally in expense tracker app. I have saved all expenses in a box called expenseBox. I have given each expense item a date and I want items with the same date to be grouped together and displayed separately. Is there a way to achieve this?
Thanks for your help!
BTW this is the code for my homescreen where I display the items.
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:flutter_locales/flutter_locales.dart';
import '/models/expense.dart';
import '/widgets/expense_list_tile.dart';
import '/screens/add_expense_screen.dart';
class HomeScreen extends StatefulWidget {
const HomeScreen({Key? key}) : super(key: key);
static const routeName = '/home_page';
#override
_HomeScreenState createState() => _HomeScreenState();
}
enum SlidableAction {
edit,
delete,
}
class _HomeScreenState extends State<HomeScreen> {
late Box expenseBox;
late Box pocketBox;
bool isFabVisible = true;
#override
void initState() {
expenseBox = Hive.box<Expense>('expenses');
pocketBox = Hive.box<int>('pocket');
super.initState();
}
#override
Widget build(BuildContext context) {
return ValueListenableBuilder(
valueListenable: Hive.box<int>('pocket').listenable(),
builder: (context, Box<int> pocketBox, child) => Scaffold(
appBar: AppBar(
title: const LocaleText('appName'),
elevation: 0,
centerTitle: true,
),
body: NestedScrollView(
headerSliverBuilder: (context, _) => [
SliverAppBar(
expandedHeight: MediaQuery.of(context).size.height * 0.15,
flexibleSpace: FlexibleSpaceBar(
background: Container(
padding: const EdgeInsets.symmetric(horizontal: 10),
child: Row(
children: [
Expanded(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const LocaleText(
'appName',
style: TextStyle(
fontSize: 14, color: Colors.white),
),
Text(
'${pocketBox.get('budget') ?? 0}',
style: const TextStyle(
fontSize: 18,
color: Colors.white,
fontWeight: FontWeight.bold),
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const LocaleText(
'income',
style: TextStyle(
fontSize: 14, color: Colors.white),
),
Text(
'${pocketBox.get('totalIncome') ?? 0}',
style: const TextStyle(
fontSize: 18,
color: Colors.white,
fontWeight: FontWeight.bold),
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const LocaleText(
'expense',
style: TextStyle(
fontSize: 14, color: Colors.white),
),
Text(
'${pocketBox.get('totalExpense') ?? 0}',
style: const TextStyle(
fontSize: 18,
color: Colors.white,
fontWeight: FontWeight.bold),
),
],
),
],
),
),
Expanded(child: Container()),
],
),
),
),
),
],
body: ValueListenableBuilder(
valueListenable: Hive.box<Expense>('expenses').listenable(),
builder: (context, Box<Expense> expensesBox, child) {
return NotificationListener<UserScrollNotification>(
onNotification: (notification) {
if (notification.direction == ScrollDirection.forward) {
if (!isFabVisible) setState(() => isFabVisible = true);
} else if (notification.direction ==
ScrollDirection.reverse) {
if (isFabVisible) setState(() => isFabVisible = false);
}
return true;
},
child: Scrollbar(
thickness: 5,
interactive: true,
child: ListView.separated(
separatorBuilder: (context, index) {
return const SizedBox();
},
itemCount: expenseBox.length,
itemBuilder: (context, index) {
final expense = expenseBox.getAt(index);
return ExpenseListTile(index: index, expense: expense);
},
),
),
);
},
),
),
floatingActionButton: isFabVisible
? FloatingActionButton(
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (_) => const AddExpenseScreen(
index: -1,
),
));
},
child: const Icon(Icons.add),
)
: null,
),
);
}
}

You can try this code.
import 'package:flutter/material.dart';
import 'package:sticky_grouped_list/sticky_grouped_list.dart';
class MyMissionList extends StatefulWidget {
#override
State<MyMissionList> createState() => _MyMissionListState();
}
class _MyMissionListState extends State<MyMissionList> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(150.0),
child: Container(
decoration: BoxDecoration(
color: AppColors.baseLightBlueColor,
// AppColors.blue,
borderRadius: BorderRadius.only(bottomRight: Radius.circular(30)),
),
child: Material(
color: AppColors.baseLightBlueColor,
elevation: 15,
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.only(bottomRight: Radius.circular(30)),
),
child: Column(
children: [
AppBar(
backgroundColor: AppColors.baseLightBlueColor,
elevation: 0.0,
actions: [
Container(
padding: EdgeInsets.only(right: 20),
child: Image.asset(
"assets/Vector-2.png",
height: 5,
width: 22,
color: Colors.white,
)),
],
),
Container(
width: MediaQuery.of(context).size.width,
padding: EdgeInsets.only(left: 20),
margin: EdgeInsets.only(bottom: 10),
decoration: BoxDecoration(
color: AppColors.baseLightBlueColor,
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
"Hello User123,",
style:
TextStyle(color: AppColors.white, fontSize: 15),
),
SizedBox(height: 10),
Text(
AppStrings.totalAmount,
// "Montant total :",
style:
TextStyle(color: AppColors.white, fontSize: 11),
),
Text(
"592,30 €",
style:
TextStyle(color: AppColors.white, fontSize: 25),
),
],
),
)
],
),
),
)),
body: Column(
children: [
Padding(
padding: const EdgeInsets.only(left:15.0,right: 15,top: 15),
child: Text("My Mission",style: TextStyle(
color: Color(0xff243656),
fontSize: 15,
fontWeight: FontWeight.w300),
),
),
Expanded(
child: StickyGroupedListView<Element, DateTime>(
elements: elements,
order: StickyGroupedListOrder.ASC,
groupBy: (Element element) =>
DateTime(element.date.year, element.date.month, element.date.day),
groupComparator: (DateTime value1, DateTime value2) =>
value2.compareTo(value1),
itemComparator: (Element element1, Element element2) =>
element1.date.compareTo(element2.date),
floatingHeader: false,
groupSeparatorBuilder: (Element element) => Container(
height: 50,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
children: [
Container(
width: 220,
padding: EdgeInsets.only(left: 20,top: 20,bottom: 10),
child: Text(
'${element.heading}',
textAlign: TextAlign.start,
style: TextStyle(color: Color(0xff919AAA)),
),
),
],
),
),
itemBuilder: (_, Element element) {
return element.type
? GestureDetector(
onTap: () {
// Navigator.push(context, MaterialPageRoute(builder: (context)=> WaitingForValidation()));
},
child: Card(
elevation: 4,
margin: EdgeInsets.only(bottom: 15, right: 15, left: 15),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15.0),
),
child: Container(
height: 70,
padding: EdgeInsets.all(10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
color: AppColors.white),
child: Row(
children: [
Container(
width: MediaQuery.of(context).size.width * 0.62,
height: 50,
padding: EdgeInsets.only(top: 10,left: 10),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
element.subTitle +
'${element.date.day}/${element.date.month}/'
'${element.date.year}',
style: TextStyle(
//color:AppColors.grey
color: Color(0xff919AAA),
fontSize: 12,
fontWeight: FontWeight.w300),
),
SizedBox(height: 2,),
Text(
element.hotelName,
style: TextStyle(
//color:AppColors.grey
color: Color(0xff243656),
fontSize: 15,
fontWeight: FontWeight.w300),
),
],
),
),
Padding(
padding: const EdgeInsets.all(5.0),
child: Card(
elevation: 15.0,
shadowColor: Colors.blue[100],
shape: const RoundedRectangleBorder(
borderRadius: BorderRadius.all(
Radius.circular(20.0))),
child: Container(
height: 30,
width: 80,
decoration: BoxDecoration(
// boxShadow: [BoxShadow(color: AppColors.grey, blurRadius: 20.0)],
borderRadius:
BorderRadius.circular(20.0),
gradient: LinearGradient(
colors: [
Colors.blue,
Colors.blue.shade900,
],
)),
child: MaterialButton(
onPressed: () {},
child: Text(
element.buttonText,
style: TextStyle(
color: Colors.white,
fontSize: 14,
fontWeight: FontWeight.bold),
),
),
),
),
),
],
),
),
),
)
: Card(
elevation: 4,
margin: EdgeInsets.only(bottom: 15, right: 15, left: 15),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15.0),
),
child: Container(
height: 70,
padding: EdgeInsets.all(10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
color: AppColors.white),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
width: MediaQuery.of(context).size.width * 0.62,
height: 50,
padding: EdgeInsets.only(top: 10,left: 10),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
element.subTitle +
'${element.date.day}/${element.date.month}/'
'${element.date.year}',
style: TextStyle(
//color:AppColors.grey
color: Color(0xff919AAA),
fontSize: 12,
fontWeight: FontWeight.w300),
),
SizedBox(height: 2,),
Text(
element.hotelName,
style: TextStyle(
//color:AppColors.grey
color: Color(0xff243656),
fontSize: 15,
fontWeight: FontWeight.w300),
),
],
),
),
Padding(
padding: const EdgeInsets.only(top:5.0,bottom: 5),
child: Container(
height: 30,
width: 95,
child: MaterialButton(
onPressed: () {},
child: Text(
element.buttonText,
style: TextStyle(
color: AppColors.green,
fontSize: 14,
fontWeight: FontWeight.bold),
),
),
),
)
],
),
),
);
},
),
),
],
),
);
}
}
class Element {
bool type;
DateTime date;
String hotelName;
String subTitle;
String heading;
String buttonText;
Element(this.date, this.type, this.hotelName, this.subTitle, this.heading,
this.buttonText);
}
List<Element> elements = <Element>[
Element(
DateTime(2020, 7, 22),
false,
"Rendez-vous equipe prod",
"Jeudi",
"Terminate",
"Terminate",
),
Element(
DateTime(2021, 10, 15),
false,
"Rendez-vous equipe prod",
"Jeudi",
"Terminate",
"Terminate",
),
Element(
DateTime(2021, 10, 15),
false,
"Rendez-vous equipe prod",
"Jeudi",
"Terminate",
/**/
"Terminate",
),
Element(
DateTime(2021, 12, 12),
true,
"Visite entrepot Villabe ",
"Mercredi",
"To Plan",
"To Plan",
),
];

type 'List<Widget>' is not a subtype of type 'Widget

'
I am a beginner in flutter dev and was trying to implement the screen but then cannot seem to get my head around the error thrown
This code below is supposed to display an onboarding screen but it seems to throw an error with the emulator regarding the title and cannot seem to find any solution on the web any help?'
class OnBoardingScreen extends StatefulWidget {
#override
_OnBoardingScreenState createState() => _OnBoardingScreenState();
}
class _OnBoardingScreenState extends State<OnBoardingScreen> {
final int _numPages = 5;
final PageController _pageController = PageController(initialPage: 0);
int _currentPage =0;
void _onIntroEnd(context) {
Navigator.of(context).push(MaterialPageRoute(builder: (_) => SignUpScreen()));
}
void _onIntroSkip(context) {
Navigator.of(context).push(MaterialPageRoute(builder: (_) => LoginScreen()));
}
_buildPageIndicator(){
List<Widget> list =[];
for (int i=0;i<_numPages;i++){
list.add(i == _currentPage ? _indicator(true) : _indicator(false) );
}
return list;
}
_indicator (bool isActive){
return AnimatedContainer(duration: Duration(milliseconds: 150),
margin: EdgeInsets.symmetric(horizontal: 8.0),
height: 8.0,
width: isActive ? 24.0 : 16.0,
decoration: BoxDecoration(color: isActive ? Colors.white:Color(0xF385AD5),
borderRadius:BorderRadius.all(Radius.circular(12))
),
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: AnnotatedRegion(
value: null,
child: Container(
decoration: BoxDecoration(
gradient:LinearGradient(
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
stops: [0.1,0.4,0.7,0.9],
colors: [
Color(0xF3C5DD7),
Color(0xF092458),
Color(0xF1B5695),
Color(0xF4664A0)
]
)
),
child: Padding(
padding: const EdgeInsets.symmetric(vertical: 40),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Container(
alignment: Alignment.centerRight,
child: TextButton(
onPressed: (){
_onIntroSkip(context);
},
child: Text(
'Skip',
style: TextStyle(
color: Colors.white,
fontSize: 20.0,
),
),
),
),
Container(
height: 600.0,
child: PageView(
physics :ClampingScrollPhysics(),
controller: _pageController,
onPageChanged: (int page){
setState(() {
_currentPage =page;
});
},
children: [
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Center(
child: Image(
image: AssetImage('assets/rooms.webp'
),
height: 300,
width: 300,
),
),
SizedBox(
height: 30.0,
),
Text('Lorem Ipsum',
style: TextStyle(
fontWeight: FontWeight.w800
),
),
SizedBox(height: 15.0,),
Text('Lorem IpSsum',style:TextStyle(
fontWeight: FontWeight.w300
),
)
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Center(
child: Image(
image: AssetImage('assets/thoughts.webp'
),
height: 300,
width: 300,
),
),
SizedBox(
height: 30.0,
),
Text('Lorem Ipsum',
style: TextStyle(
fontWeight: FontWeight.w800
),
),
SizedBox(height: 15.0,),
Text('Lorem IpSsum',style:TextStyle(
fontWeight: FontWeight.w300
),
)
],
),
),
Padding(
padding: EdgeInsets.all(40.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Center(
child: Image(
image: AssetImage('group.jpg'
),
height: 300,
width: 300,
),
),
SizedBox(
height: 30.0,
),
Text('Lorem Ipsum',
style: TextStyle(
fontWeight: FontWeight.w800
),
),
SizedBox(height: 15.0,),
Text('Lorem IpSsum',style:TextStyle(
fontWeight: FontWeight.w300
),
)
],
),
),
],
),
),
Row(
mainAxisAlignment:MainAxisAlignment.center ,children: [
_buildPageIndicator() ,
],
),
_currentPage != _numPages - 1 ?
Expanded(
child: Align(
alignment: FractionalOffset.bottomRight,
child: TextButton(
onPressed: () {
_pageController.nextPage(duration: Duration(milliseconds: 500), curve: Curves.ease);
}, child:Row(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
Text('Next',style: TextStyle(color: Colors.white,
fontSize: 22.0),),
SizedBox(
width: 10.0,
),
Icon(
Icons.arrow_forward,
color: Colors.white,
size: 30,
)
],
),
),
),
)
:
Text("")
],
),
),
),
),
bottomSheet:_currentPage == _numPages -1 ? Container(
height: 100.0,
width: double.infinity,
color: Colors.white,
child: GestureDetector(
onTap: (){
_onIntroEnd(context);
},
child: Center(
child: Padding(padding: EdgeInsets.only(bottom: 30.0),child:
Text(
'Get Started',
style: TextStyle(
color: Color(0xF3C5DD7),
fontSize: 20.0,
fontWeight: FontWeight.bold,
),
)),
),
),
) :
Text(''),
);
}
}
'This is supposed to display an Onboarding Screen but throws an error . This is shown with the image attached '

Change these parts of your code to look like this:
List<Widget> _buildPageIndicator(){
List<Widget> list =[];
for (int i=0;i<_numPages;i++){
list.add(i == _currentPage ? _indicator(true) : _indicator(false) );
}
return list;
}
.
.
.
.
Row(
mainAxisAlignment:MainAxisAlignment.center,
children: _buildPageIndicator() ,
),

Replace this part of your code:
...
Row(
mainAxisAlignment:MainAxisAlignment.center ,children: [
_buildPageIndicator() ,
],
),
...
with
...
Row(
mainAxisAlignment:MainAxisAlignment.center, children: _buildPageIndicator(),
),
...
or with
...
Row(
mainAxisAlignment:MainAxisAlignment.center ,children: [
..._buildPageIndicator(),
],
),
...

Develop Reference

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GridView.Count is not visible without fixing the height of parent container - android

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Cannot Scroll ListView inside FutureBuilder

A value of type 'Object?' can't be assigned to a variable of type 'SinginCharacter' [closed]

Can we group or filter data inside our hive boxes

type 'List<Widget>' is not a subtype of type 'Widget

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