samples/android_splash_screen/lib/main.dart

/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
  * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'package:flutter/material.dart';

Future<void> main() async {
  runApp(const MyApp());
}

/* Main widget that contains the Flutter starter app. */
class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          children: <Widget>[
            const Padding(
                padding: EdgeInsets.only(top: 42, bottom: 250),
                child: Align(
                    alignment: Alignment.topCenter, child: CustomAppBar())),
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

/* A Flutter implementation of the last frame of the splashscreen animation */
class CustomAppBar extends StatelessWidget {
  const CustomAppBar({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    Widget titleSection = Row(
      children: [
        Padding(
          padding: const EdgeInsets.only(left: 12, right: 4),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(36.0),
            child: Image.asset(
              'images/androidIcon.png',
              width: 72.0,
              height: 72.0,
              fit: BoxFit.fill,
            ),
          ),
        ),
        const Padding(
          padding: EdgeInsets.only(top: 3),
          child: Text("Super Splash Screen Demo",
              style: TextStyle(color: Colors.black54, fontSize: 24)),
        ),
      ],
    );
    return titleSection;
  }
}