initialize method
第二步 初始化消息通道 Step 2: initialize the message channel
Implementation
Future<bool> initialize() async {
assert(_channel != null, 'You must call setMethodChannel() first');
if (!_supportPlatform || _channel == null) return false;
bool? state = await _channel!.invokeMethod<bool?>('startEvent');
if (state == true && _eventChannel == null) {
_eventChannel = const EventChannel('fl.camera.event');
_stream = _eventChannel!.receiveBroadcastStream();
}
return state == true && _eventChannel != null && _stream != null;
}