Flutter - FutureBuilder
main.dart
import 'package:flutter/material.dart';
import 'src/app.dart';
void main() => runApp(App());
src/app.dart
import 'package:flutter/material.dart';
import 'screens/news_list.dart';
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'HackerNews',
home: NewsList(),
);
}
}
src/screens/news_list.dart
import 'package:flutter/material.dart';
class NewsList extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Top News'),
),
body: buildList(),
);
}
Widget buildList() {
return ListView.builder(
itemCount: 1000,
itemBuilder: (context, index) {
return FutureBuilder(
future: getFuture(),
builder: (context, snapshot) {
return Container(
height: 80,
child: snapshot.hasData
? Text(
'Im visible $index',
style: TextStyle(color: Colors.blue),
)
: Text(
'I havent fetched yet $index',
style: TextStyle(color: Colors.red),
),
);
},
);
},
);
}
getFuture() {
return Future.delayed(
Duration(seconds: 1),
() => 'hi',
);
}
}
Item Visible
fetchIem timeline
Future pending