Nilen Patel Inc.

Tutorial and code of Country Code Picker in Flutter. Copy and paste the below code as per your requirements.

intl_phone_field: ^3.0.1

import 'package:flutter/material.dart';
import 'package:intl_phone_field/intl_phone_field.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

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

class _MyAppState extends State<MyApp> {
  final GlobalKey<FormState> _formKey = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Center(child:Text('Country Code Picker')),
        ),
        body: Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                const SizedBox(height: 30),
                IntlPhoneField(
                  decoration: const InputDecoration(
                    labelText: 'Phone Number',
                    border: OutlineInputBorder(
                      borderSide: BorderSide(),
                    ),
                  ),
                  onChanged: (phone) {
                    print(phone.completeNumber);
                  },
                  onCountryChanged: (country) {
                    print('Country changed to: ' + country.name);
                  },
                ),
                const SizedBox(
                  height: 10,
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}