initialize method
第二步 初始化消息通道 Step 2: initialize the message channel
Implementation
Future<bool> initialize() async {
if (!_supportPlatform) return false;
bool? state = await _channel.invokeMethod<bool?>('startEvent');
state ??= false;
if (state && _eventChannel == null) {
_eventChannel = const EventChannel(_flCameraEvent);
_stream = _eventChannel?.receiveBroadcastStream(<dynamic, dynamic>{});
}
return state && _eventChannel != null && _stream != null;
}