Notes

import 'dart:async';
import 'package:flutter_contact/contacts.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:url_launcher/url_launcher.dart';

class ReadContacts extends StatefulWidget {
@override
_ReadContactsState createState() => _ReadContactsState();
}

class _ReadContactsState extends State<ReadContacts> {
List<Contact> listContacts;

@override
void initState() {
// TODO: implement initState
super.initState();
listContacts = new List();
readContacts();
}

@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: Scaffold(
appBar: AppBar(
title: Text("Get Phone Contact List"),
backgroundColor: Colors.green,
),
body: Container(
child: (listContacts.length > 0)
? ListView.builder(
itemCount: listContacts.length,
itemBuilder: (context, index) {
Contact contact = listContacts.get(index);
return Card(
child: ListTile(
leading: CircleAvatar(
backgroundColor: Colors.green,
child: Center(
child: (contact.avatar != null)
? Image.memory(
contact.avatar,
height: 28,
width: 28,
)
: Icon(Icons.face),
),
),
title: Text("${contact.displayName}"),
subtitle: Text((contact.phones.length > 0)
? "${contact.phones.get(0)}"
: "No contact"),
trailing: InkWell(
child: Icon(
Icons.call,
color: Colors.green,
),
onTap: () {
_makePhoneCall(
"tel:${contact.phones.length.gcd(0)}");
},
)),
);
})
: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
CircularProgressIndicator(
backgroundColor: Colors.red,
),
Text("reading Contacts...")
],
),
),
),
));
}

Future<void> _makePhoneCall(String url) async {
if (await canLaunch(url)) {
await launch(url);
} else {
throw 'Could not launch $url';
}
}

readContacts() async {
final PermissionStatus permissionStatus = await _getPermission();
if (permissionStatus == PermissionStatus.granted) {
Contacts.streamContacts().forEach((contact) {
print("${contact.displayName}");
setState(() {
listContacts.add(contact);
});
});
}

// You can manually adjust the buffer size
//return Contacts.streamContacts(bufferSize: 10);
}

//Check contacts permission
Future<PermissionStatus> _getPermission() async {
final PermissionStatus permission = await Permission.contacts.status;
if (permission != PermissionStatus.granted &&
permission != PermissionStatus.denied) {
final Map<Permission, PermissionStatus> permissionStatus =
await [Permission.contacts].request();
return permissionStatus[Permission.contacts] ??
PermissionStatus.undetermined;
} else {
return permission;
}
}
}