如何通过flutter启动WhatsApp

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter WhatsApp Launcher'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('启动WhatsApp'),
          onPressed: () {
            // 在这里编写启动WhatsApp的代码
          },
        ),
      ),
    );
  }
}

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

void main() {
  runApp(MaterialApp(
    home: MyApp(),
  ));
  FlutterLauncherName.setLauncherName('Flutter WhatsApp Launcher');
  FlutterLauncherIcons.setLauncherIcons(LauncherIcons());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter WhatsApp Launcher'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('启动WhatsApp'),
          onPressed: () {
            launch('whatsapp://');
          },
        ),
      ),
    );
  }
}

class LauncherIcons extends FlutterLauncherIconsConfig {
  @override
  String get androidIconLauncherName => 'launcher_icon';

  @override
  List<IconEntry> get androidIcons => [
        IconEntry(
          name: 'launcher_icon',
          density: 'xxhdpi',
        ),
      ];

  @override
  String get iosIconAsset => 'assets/launcher_icon.png';
}