scanDevices method
开始扫描设备
Implementation
void scanDevices({List<DevicesFilter>? filters}) {
if (_disposed) {
throw Exception("Scanning task can not start after disposed");
}
_filters.clear();
if (filters != null) {
for (var i = 0; i < filters.length; i++) {
_filters.add(filters[i]);
}
}
_scannerHelper!.addDeviceUpdateListener(_deviceUpdateHandler);
}