public void removeScanningCallback(OneSheeldScanningCallback scanningCallback){
  if (scanningCallback != null && scanningCallbacks.contains(scanningCallback))   scanningCallbacks.remove(scanningCallback);
}

public void removeScanningCallback ( OneSheeldScanningCallback scanningCallback ) { if ( scanningCallback != null && scanningCallbacks . contains ( scanningCallback ) ) scanningCallbacks . remove ( scanningCallback ) ; }
remove a scanning callback .
