FutureProvider example

futureprovider_example.dart

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    const appTitle = 'FutureProvider Demo';
    return MaterialApp(
        title: appTitle,
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: FutureProvider<bool>(
          initialData: true,
          builder: (context) {
            // Pretend we're saving data and it takes 4 seconds.
            return Future.delayed(Duration(seconds: 4), () => false);
          },
          child: Scaffold(
            appBar: AppBar(
              title: Text(appTitle),
            ),
            body: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Consumer<bool>(
                      builder: (context, saving, child) {
                        return Text(saving ? "Saving..." : "Saved!");
                      },
                  ),
                ],
              ),
            ),
          ),
        ));
  }
}