add contact flutter android

import 'package:flutter/material.dart';
import 'package:contacts_service/contacts_service.dart';
import 'package:flutter/services.dart';
import 'package:permission_handler/permission_handler.dart';

class Addcontact extends StatefulWidget {
  Addcontact({Key key}) : super(key: key);

  @override
  _AddcontactState createState() => _AddcontactState();
}

class _AddcontactState extends State<Addcontact> {
  TextEditingController name = TextEditingController();
  TextEditingController number = TextEditingController();

 

  Future<dynamic> addcontact() async {
    Contact contact = Contact();
    contact.phones = [Item(label: "mobile", value: "${number.text}")];
    contact.givenName = name.text;
    await ContactsService.addContact(contact);
  }

  @override
  Widget build(BuildContext context) {
    return Container(
        padding: EdgeInsets.all(30),
        child: Center(
            child: Column(
          children: [
            TextField(
              controller: name,
              keyboardType: TextInputType.text,
            ),
            SizedBox(height: 20),
            TextField(
              controller: number,
              keyboardType: TextInputType.number,
            ),
            SizedBox(height: 20),
            RaisedButton(
              onPressed: () async {
                if (await Permission.contacts.request().isGranted) {
            addcontact();
            }   
              },
              color: Colors.greenAccent,
              child: Text('save contact'),
            )
          ],
        )));
  }
}