base_page.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
 // This widget is the root of your application.
 @override
 Widget build(BuildContext context) {
   return MaterialApp(
     title: 'Flutter Demo',
     theme: ThemeData(
       // This is the theme of your application.
       //
       // Try running your application with "flutter run". You'll see the
       // application has a blue toolbar. Then, without quitting the app, try
       // changing the primarySwatch below to Colors.green and then invoke
       // "hot reload" (press "r" in the console where you ran "flutter run",
       // or simply save your changes to "hot reload" in a Flutter IDE).
       // Notice that the counter didn't reset back to zero; the application
       // is not restarted.
       primarySwatch: Colors.blue,
     ),
     home: MyHomePage(),
   );
 }
}

class MyHomePage extends StatefulWidget {
 @override
 _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
 @override
 Widget build(BuildContext context) {
   return Scaffold(
     appBar: AppBar(
       title: Text("Animation Demo"),
     ),
   );
 }
}