Show loading while image is loading in flutter

Here is an example of how to show loading while an image is loading in flutter. 

import 'package:flutter/material.dart';

main(List<String> args) {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @
override

  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(body: MyHomePage()),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @
override

  Widget build(BuildContext context) {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(38.0),
        child: FadeInImage(
          image: NetworkImage(
              'https://flutter.dev/assets/images/shared/brand/flutter/logo/flutter-lockup.png'),
          placeholder: AssetImage('assets/spinner2.gif'),
        ),
      ),
    );
  }
}

Thanks,