Flutter Agora.io calling screen

Question

I want to add in-app (video) calling like Messenger (Facebook) does. It works when one party creates channel and another one joins.

But is there a way to create calling screen where party B can accept or reject call? I am looking in Agora.io documentation but cannot find anything suitable for this.

This is my code though...

 Future<void> initialize() async {
    if (APP_ID.isEmpty) {
      setState(() {
        _infoStrings.add(
          'APP_ID missing, please provide your APP_ID in settings.dart',
        );
        _infoStrings.add('Agora Engine is not starting');
      });
      return;
    }

    await _initAgoraRtcEngine();
    _addAgoraEventHandlers();
    await AgoraRtcEngine.enableWebSdkInteroperability(true);
    await AgoraRtcEngine.setParameters('''
{\"che.video.lowBitRateStreamParameter\":{\"width\":320,\"height\":180,\"frameRate\":15,\"bitRate\":140}}''');
    await AgoraRtcEngine.joinChannel(null, 'Test', null, 0);
  }

  Future<void> _initAgoraRtcEngine() async {
    AgoraRtcEngine.create(APP_ID);
    AgoraRtcEngine.enableVideo();
  }

  void _addAgoraEventHandlers() {
    AgoraRtcEngine.onError = (dynamic code) {
      setState(() {
        final info = 'onError: $code';
        _infoStrings.add(info);
      });
    };

    AgoraRtcEngine.onJoinChannelSuccess = (
      String channel,
      int uid,
      int elapsed,
    ) {
      setState(() {
        final info = 'onJoinChannel: $channel, uid: $uid';
        _infoStrings.add(info);
      });
    };

    AgoraRtcEngine.onLeaveChannel = () {
      setState(() {
        _infoStrings.add('onLeaveChannel');
        _users.clear();
      });
    };

    AgoraRtcEngine.onUserJoined = (int uid, int elapsed) {
      setState(() {
        final info = 'userJoined: $uid';
        _infoStrings.add(info);
        _users.add(uid);
      });
    };

    AgoraRtcEngine.onUserOffline = (int uid, int reason) {
      setState(() {
        final info = 'userOffline: $uid';
        _infoStrings.add(info);
        _users.remove(uid);
      });
    };

    AgoraRtcEngine.onFirstRemoteVideoFrame = (
      int uid,
      int width,
      int height,
      int elapsed,
    ) {
      setState(() {
        final info = 'firstRemoteVideo: $uid ${width}x $height';
        _infoStrings.add(info);
      });
    };
  } 

Answer 1

You will need to push channelId to other user mobile in this case. The CS Guy has created very useful video on you tube to implement this step as well as calling screen.

https://www.youtube.com/watch?v=v9ngriCV0J0

Answer 2

You need to use Native ConnectionService for Android and Callkit of iOS.

You can find the official Agora samples for the above feature here: https://github.com/AgoraIO/Advanced-Video/tree/master/Calling-Interface, but I don't think Agora has call-interface sample in Flutter, you have to write the wrapper on your own for now.