Use Scaffold key for showing snackbar.
```
class SignIn extends StatefulWidget {
@override
_SignInState createState() {
return _SignInState();
}
}
class _SignInState extends State<SignIn> {
final _formKey = GlobalKey<FormState>();
final _scaffoldKey = GlobalKey<ScaffoldState>();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: "Hello",
home: Scaffold(
key: _scaffoldKey,
body: Center(
child: ListView(
shrinkWrap: true,
children: <Widget>[
Center(
child: Form(
key: _formKey,
child: Column(children: <Widget>[
Container(
child: Column(
children: <Widget>[
Container(
child: Row(
children: <Widget>[
ElevatedButton(
child: Text("Login"),
onPressed: () async {
_scaffoldKey.currentState.showSnackBar(
SnackBar(
content: Text("Hello there!"),
),
);
})
],
),
)
],
),
)
]),
),
),
],
),
),
),
);
}
}
```
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,
),
),
],
),
);
```
