gistfile1.dart

import 'package:flutter/material.dart';

final 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: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  bool isAndroid = true;
  String title = "Flutter Interact";

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        IconButton(icon: Icon(Icons.menu)),
        Expanded(child: Text(title)),
        if (isAndroid)
          RaisedButton(child: Text("Search"))
        else
          IconButton(icon: Icon(Icons.search))
      ],
    );
  }
}