import 'package:flutter/material.dart'; import 'package:provider/provider.dart'; import 'data.dart'; class UI extends StatelessWidget { const UI({super.key}); @override Widget build(BuildContext context) { return const MaterialApp( home: ContactList(), ); } } class ContactList extends StatelessWidget { const ContactList({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: const Text("Contacts")), body: Consumer( builder: (BuildContext context, AppState state, Widget? child) { return ListView.builder( itemCount: state.contacts.length, itemBuilder: (BuildContext context, int index) { final Contact contact = state.contacts[index]; return ListTile( leading: Icon( contact.isOpen ? Icons.meeting_room : Icons.door_front_door, color: contact.isOpen ? Colors.red : Colors.green, ), title: Text(contact.address), ); }, ); }, ), ); } }