addListener method
添加消息流监听
Implementation
Future<bool> addListener(EventListen eventListen) async {
if (!supportPlatform) return false;
if (_eventChannel != null && _stream != null) {
if (_streamSubscription != null) return false;
try {
_streamSubscription = _stream!.listen(eventListen);
return true;
} catch (e) {
log(e);
return false;
}
}
return false;
}