This is invoked when there is an error during discovery. The discovery will be cancelled when this method is invoked. DiscoveryHandler.DiscoveryFinished() will not be called if this method is invoked.

This method is invoked when discovery is finished.

This method is invoked when a printer has been discovered by one of the discovery methods in either the BluetoothDiscoverer or NetworkDiscoverer. This method will be invoked for each printer that is found.