Handle online/offline on Flutter

sample_online_offline.dart

import 'package:flutter/material.dart';

const 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: Container(
          color: isOnline(Colors.red, Colors.blue),
          child: isOnline(MyWidget(), Container(color: Colors.blue)),
        ),
      ),
    );
  }

  T isOnline<T>(T online, T offline) {
    /// Check online/offline
    bool isOnline = false;


    return isOnline ? online : offline;
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Text(
      'Hello, World!',
      style: Theme.of(context).textTheme.headline4,
    );
  }
}