Flutter, using FutureBuilder within SliverFillRemaining - flutter

Question

I am building a FutureBuilder with a Listview within a SliverFillRemaining. And I think since Sliver is already within a CustomScrollView the scroll function doesn't work properly. Once it scrolls down it doesn't scroll back up.
Below is the code.
#override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(
expandedHeight: 200.0,
floating: false,
//pinned: false,
flexibleSpace: FlexibleSpaceBar(
background: Image.network("https://i.imgur.com/p3CfZBS.png",
fit: BoxFit.cover),
),
),
SliverFillRemaining(
child: Container(
child: FutureBuilder(
future: _getData(),
builder: (context, snapshot) {
if (snapshot.data == null) {
return Center(child: CircularProgressIndicator());
} else {
return ListView.builder(
itemCount: snapshot.data.length,
itemBuilder: (context, index) {
return ListView(
shrinkWrap: true,
children: [
buildlink(
imageName: snapshot.data[index].image,
page: snapshot.data[index].title)
],
);
},
);
}
},
),
),
),
],
),
);
}
}

Answer 1

most likely the 2nd listView is superfluous and probably you want to use physics: NeverScrollableScrollPhysics() with list view, if you use CustomScrollView. Check NestedScrollView may be it would work better in this situation.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
body: SafeArea(
child: MyHomePage(),
),
),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(
expandedHeight: 200.0,
floating: false,
pinned: false,
flexibleSpace: FlexibleSpaceBar(
background: Image.network("https://i.imgur.com/p3CfZBS.png",
fit: BoxFit.cover),
),
),
SliverFillRemaining(
child: Container(
child: FutureBuilder(
future: _getData(),
builder: (context, snapshot) {
if (snapshot.data == null) {
return Center(child: CircularProgressIndicator());
} else {
return ListView.builder(
physics: NeverScrollableScrollPhysics(),
itemCount: snapshot.data.length,
itemBuilder: (context, index) {
return buildlink(
imageName: snapshot.data[index].image,
page: snapshot.data[index].title,
);
},
);
}
},
),
),
),
],
),
);
}
Future<List<LinkData>> _getData() async {
await Future.delayed(Duration(seconds: 1));
return [
LinkData(image: "https://i.imgur.com/p3CfZBS.png", title: 'First'),
LinkData(image: "https://i.imgur.com/p3CfZBS.png", title: 'Second'),
LinkData(image: "https://i.imgur.com/p3CfZBS.png", title: 'Third'),
];
}
Widget buildlink({String imageName, String page}) {
return Card(
child: Container(
child: Text(page),
height: 400,
),
);
}
}
class LinkData {
const LinkData({
this.image,
this.title,
});
final String image;
final String title;
}