```dart import 'package:flutter/material.dart'; /// Flutter code sample for [FutureBuilder]. void main() => runApp(const FutureBuilderExampleApp()); class FutureBuilderExampleApp extends StatelessWidget { const FutureBuilderExampleApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp( home: FutureBuilderExample(), ); } } class FutureBuilderExample extends StatefulWidget { const FutureBuilderExample({super.key}); @override State createState() => _FutureBuilderExampleState(); } class _FutureBuilderExampleState extends State { final Future _calculation = Future.delayed( const Duration(seconds: 2), () => 'Data Loaded', ); @override Widget build(BuildContext context) { return DefaultTextStyle( style: Theme.of(context).textTheme.displayMedium!, textAlign: TextAlign.center, child: FutureBuilder( future: _calculation, // a previously-obtained Future or null builder: (BuildContext context, AsyncSnapshot snapshot) { List children; if (snapshot.hasData) { children = [ const Icon( Icons.check_circle_outline, color: Colors.green, size: 60, ), Padding( padding: const EdgeInsets.only(top: 16), child: Text('Result: ${snapshot.data}'), ), ]; } else if (snapshot.hasError) { children = [ const Icon( Icons.error_outline, color: Colors.red, size: 60, ), Padding( padding: const EdgeInsets.only(top: 16), child: Text('Error: ${snapshot.error}'), ), ]; } else { children = const [ SizedBox( width: 60, height: 60, child: CircularProgressIndicator(), ), Padding( padding: EdgeInsets.only(top: 16), child: Text('Awaiting result...'), ), ]; } return Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: children, ), ); }, ), ); } } ```