Email email = Email(
    to: ['[email protected],[email protected]'],
    cc: ['[email protected]'],
    bcc: ['[email protected]'],
    subject: 'subject',
    body: 'body'
);
await EmailLauncher.launch(email);

import 'package:email_launcher/email_launcher.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _toController = TextEditingController();
  final _ccController = TextEditingController();
  final _bccController = TextEditingController();
  final _subjectController = TextEditingController();
  final _bodyController = TextEditingController();

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    _toController.dispose();
    _ccController.dispose();
    _bccController.dispose();
    _subjectController.dispose();
    _bodyController.dispose();
    super.dispose();
  }

  void _launchEmail() async {
    List<String> to = _toController.text.split(',');
    List<String> cc = _ccController.text.split(',');
    List<String> bcc = _bccController.text.split(',');
    String subject = _subjectController.text;
    String body = _bodyController.text;

    Email email = Email(to: to, cc: cc, bcc: bcc, subject: subject, body: body);
    EmailLauncher.launch(email).then((value) {
      // success
      print(value);
    }).catchError((error) {
      // has error
      print(error);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text("Plugin example app"),
        ),
        body: ListView(
          children: [
            _buildTextField(
                _toController, TextInputType.emailAddress, 'Enter to'),
            _buildTextField(
                _ccController, TextInputType.emailAddress, 'Enter cc'),
            _buildTextField(
                _bccController, TextInputType.emailAddress, 'Enter bcc'),
            _buildTextField(
                _subjectController, TextInputType.text, 'Enter subject'),
            _buildTextField(_bodyController, TextInputType.text, 'Enter body'),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: ElevatedButton(
                  onPressed: _launchEmail, child: Text('Launch Email')),
            )
          ],
        ),
      ),
    );
  }

  Widget _buildTextField(TextEditingController controller,
      TextInputType inputType, String hintText) {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: TextField(
        controller: controller,
        keyboardType: inputType,
        decoration: InputDecoration(
            border: OutlineInputBorder(
              borderSide: BorderSide(color: Colors.black54),
            ),
            hintText: hintText),
      ),
    );
  }
}