How do I to print several images?

Regards, I am developing an app on Android and I use the RW420 printer to print a invoice, that contains three images, but it only prints one image. How can print several images.

the code is something....

 

final String graphic1 = Enviroment.get ...........+ "image1.jpg";

...

...

ZebraPrinter printer = ZebraPrinterFactory.getInstance(PrinterLanguage.CPCL, connection);

    printer.printImage(graphic1,438,18,500,500,false);

    printer.printImage(graphic2,18,18,500,500,false);

...

...

.....looks like:

FACT.png

 

 

 

thanks for any help