Try with this i slowed for 1 second because if i don't add this you will see always 0 .
import 'package:flutter/material.dart';
void main() => runApp(MaterialApp(
debugShowCheckedModeBanner: false,
home: idcard(),
));
class idcard extends StatefulWidget {
@override
State<idcard> createState() => _idcardState();
}
class _idcardState extends State<idcard> {
int ballNumber = 0;
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[800],
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() {
for (ballNumber = 0; ballNumber <= 5; ballNumber += 1);
});
Future.delayed(Duration(seconds:1),(){
setState((){
ballNumber=0;
});
});
},
backgroundColor: Colors.yellow[800],
child: Icon(Icons.add),
),
appBar: AppBar(
backgroundColor: Colors.yellow[800],
title: Text("Ball Counter"),
centerTitle: true,
elevation: 0.0,
),
body: Padding(
padding: EdgeInsets.fromLTRB(0, 50, 0, 0),
child: Center(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Text("Ball number",
textAlign: TextAlign.center,
style: TextStyle(fontSize: 20, color: Colors.white)),
SizedBox(height: 10),
Text("$ballNumber",
textAlign: TextAlign.center,
style: TextStyle(fontSize: 90, color: Colors.yellow[800])),
],
),
),
),
);
}
}
najeira's solution is easy and simple, but you can get the same and more flexible result without touching index.
Instead of using listView, you could use **CustomScrollView & SliverList** which is functionally the same as listView.
```
return Scaffold(
body: CustomScrollView(
slivers: <Widget>[
SliverToBoxAdapter(
// you could add any widget
child: ListTile(
leading: CircleAvatar(
backgroundColor: Colors.transparent,
),
title: Row(
children: <Widget>[
Expanded(child: Text("First Name")),
Expanded(child: Text("Last Name")),
Expanded(child: Text("City")),
Expanded(child: Text("Id")),
],
),
),
),
SliverList(
delegate: SliverChildBuilderDelegate(
(context, index) {
return InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => APIDetailView(data[index])),
);
},
child: ListTile(
//return ListTile(
leading: CircleAvatar(
backgroundColor: Colors.blue,
child: Text(data[index]["FirstName"][0]),
),
title: Row(
children: <Widget>[
Expanded(child: Text(data[index]["FirstName"])),
Expanded(child: Text(data[index]["LastName"])),
Expanded(child: Text(data[index]["Bill_City"])),
Expanded(child: Text(data[index]["Customer_Id"])),
],
),
),
);
},
childCount: data == null ? 0 : data.length,
),
),
],
),
);
```
