Welcome to ESC/POS Bluetooth Print, thermal Bluetooth Printer solution. It's an opensource tutorial project full source code is available on gitHub.
My test device was Cashino PTP-II Printer. Demo Application with Source Code.
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Source Code: https://github.com/imrankst1221/Thermal-Printer-in-Android
Video Preview: https://youtu.be/emedLinWHR4