Unfortunately this lib doesn't have support for other characters but hardcoded in GBK, you will have to fork (and contribute to support multiple characters is very much appreciated) and modify it as your need, simply replace "GBK" (in PrinterService.java) to your desired character should do the trick!
Unfortunately this lib doesn't have support for other characters but hardcoded in GBK, you will have to fork (and contribute to support multiple characters is very much appreciated) and modify it as your need, simply replace "GBK" (in PrinterService.java) to your desired character should do the trick!