如何在flutter中实现agora视频通话邀请

import 'package:agora_rtc_engine/rtc_engine.dart';

void main() {
  // 初始化Agora SDK
  RtcEngine.create('YOUR_APP_ID');
  runApp(MyApp());
}

import 'package:agora_rtc_engine/rtc_engine.dart';

class VideoCallScreen extends StatefulWidget {
  @override
  _VideoCallScreenState createState() => _VideoCallScreenState();
}

class _VideoCallScreenState extends State<VideoCallScreen> {
  @override
  void initState() {
    super.initState();
    // 加入频道
    _joinChannel();
  }

  @override
  void dispose() {
    // 离开频道
    _leaveChannel();
    super.dispose();
  }

  Future<void> _joinChannel() async {
    await AgoraRtcEngine.enableVideo();
    await AgoraRtcEngine.joinChannel(null, 'channel_name', null, 0);
  }

  Future<void> _leaveChannel() async {
    await AgoraRtcEngine.leaveChannel();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('视频通话'),
      ),
      body: Center(
        child: Text('视频通话界面'),
      ),
    );
  }
}

import 'package:agora_rtc_engine/rtc_engine.dart';

class InviteButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      onPressed: () {
        // 发起邀请
        _inviteUser();
      },
      child: Text('邀请'),
    );
  }

  void _inviteUser() {
    // 调用Agora SDK的邀请方法
    AgoraRtcEngine.inviteUserToChannel('user_id', 'channel_name', null, 0);
  }
}