flutterでtimerを利用して自動で画面画面遷移する

サンプルコード

import 'dart:async';

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: const Scaffold(
        body: Center(
          child: FirstScreen(),
        ),
      ),
    );
  }
}

/// Releaxing screen that stays visible for 3 seconds
class FirstScreen extends StatefulWidget {
  const FirstScreen({Key? key}) : super(key: key);

  @override
  _FirstScreenState createState() => _FirstScreenState();
}

class _FirstScreenState extends State<FirstScreen> {
  //Declare a timer
  Timer? timer;


  @override
  void initState() {
    super.initState();

    timer = Timer(
      const Duration(seconds: 3),
      () {
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => const NextScreen(),
          ),
        );
      },
    );
  }

  @override
  void dispose() {
    super.dispose();
    timer?.cancel();
  }

  @override
  Widget build(BuildContext context) {
    return const Image(
      image: NetworkImage('https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg'),
    );
  }
}

class NextScreen extends StatelessWidget {
  const NextScreen({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const Scaffold(
      body: Center(
        child: Text("Next Screen"),
      ),
    );
  }
}

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