attach method
Implementation
void attach(int id) {
_channel = EventChannel('${_scanType}_$id/event');
_methodChannel = MethodChannel('${_scanType}_$id/method');
_stream = _channel.receiveBroadcastStream(
{
"isPlay": isPlay,
},
);
_subscription = _stream.listen((data) {
this.result = RScanResult.formMap(data);
notifyListeners();
});
}