addAdvancedListener method
Implementation
void addAdvancedListener(BarcodeTrackingAdvancedListener listener) {
_checkAndSubscribeListeners();
if (_advancedListeners.contains(listener)) {
return;
}
_advancedListeners.add(listener);
}
void addAdvancedListener(BarcodeTrackingAdvancedListener listener) {
_checkAndSubscribeListeners();
if (_advancedListeners.contains(listener)) {
return;
}
_advancedListeners.add(listener);
}