Image.network

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool selected = false;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('FlutterZero')),
        body: Center(
          child: Image.network(
            'https://flutter.github.io/assets-for-api-docs/assets/widgets/owl.jpg',
          ),
        ),
      ),
    );
  }
}