How To Make A Phone Call From Flutter Android App

dependencies:
  flutter:
    sdk: flutter
  url_launcher: ^4.1.0

flutter pub get

import 'package:url_launcher/url_launcher.dart';

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final String phone = 'tel:+2347012345678';

  _callPhone() async {
    if (await canLaunch(phone)) {
      await launch(phone);
    } else {
      throw 'Could not Call Phone';
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          backgroundColor: Colors.orange[900],
          title: Text('Call Phone from App'
          )),
      body: Center(
          child: RaisedButton(
            onPressed: _callPhone,
            child: Text('Phone Call',style: TextStyle(color: Colors.white),),
            color: Colors.orange[900],
          )),
    );
  }
}