solution3.dart

import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        home: BallPage(),
      ),
    );

class BallPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blue,
      appBar: AppBar(
        backgroundColor: Colors.blue.shade900,
        title: Text('Ask Me Anything'),
      ),
      body: Ball(),
    );
  }
}

class Ball extends StatefulWidget {
  @override
  _BallState createState() => _BallState();
}

class _BallState extends State<Ball> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Image.asset('images/ball1.png'),
    );
  }
}

import 'package:flutter/material.dart';

void main() => runApp(
MaterialApp(
home: BallPage(),
),
);

class BallPage extends StatelessWidget {
@OverRide
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.blue,
appBar: AppBar(
backgroundColor: Colors.blue.shade900,
title: Text('Ask Me Anything'),
),
body: Ball(),
);
}
}

class Ball extends StatefulWidget {
@OverRide
_BallState createState() => _BallState();
}

class _BallState extends State {
@OverRide
Widget build(BuildContext context) {
return Center(
child: Image.asset('images/ball1.png'),
);
}
}