It's native printing in apps (Gmail,Word,..) .
Find menu items "share", "send" or "open" in you app, click and select RawBT.
(Gallery,FileManager and many other application)
a href = "rawbt:Hello,%20world!%0A%0A" - Sheme rawbt
a href = "test.txt" - link to text file
a href = "rawbt:base64,G0A...."> - Binary raw data printing
see more at http://rawbt.402d.ru/app2/
Android >= 4.0: Print plain text & images
Android >= 5.0: Print PDF, work as Print Service
Bluetooth, WiFi / Lan , USB (requred harware with OTG).
.
App used:
ESC @ - initialize
ESC t - Switch character table
GS v 0 - Print an image, using the older "bit image" command.
https://github.com/402d/DemoRawBtPrinter
ပုံနှိပ်ဝန်ဆောင်မှု (standart ပုံနှိပ်ခြင်း) ကဲ့သို့သော