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Gets the printers that should be tracked. These are printers that are important to the user and for which you received a call to PrinterDiscoverySession.OnStartPrinterStateTracking(Android.Print.PrinterId) asking you to observer their state and reporting it to the system via PrinterDiscoverySession.addPrinters(java.util.List<android.print.PrinterInfo>). You will receive a call to PrinterDiscoverySession.OnStopPrinterStateTracking(Android.Print.PrinterId) if you should stop tracking a printer.
Note: Calls to this method after the session is destroyed, that is after the PrinterDiscoverySession.OnDestroy callback, will be ignored.