room_detail_view_model.dart

  joinRoom() async {
    await [Permission.microphone, Permission.camera].request();
    agora.joinChannel(
      channelId: room.identifier,
      onJoinChannelComplete: () {
        database.addSpeaker(room: room, speaker: currentUser);
      },
      onLeaveChannelComplete: () {
        database.removeSpeaker(room: room, speaker: currentUser);
      },
      onMuteStatusChanged: (bool isMuted) {
        database.setMuteStatus(
          speaker: currentUser,
          isMuted: isMuted
        );
      },
      setActiveSpeaker: (bool isSpeaking) {
        database.setActiveSpeaker(
          speaker: currentUser,
          isSpeaking: isSpeaking
        );
      }
    );
  }