Android Question How to create sales bill and print to bluetooth or wifi printer

Guys i m new to b4a
any examples available here to create a invoice bill and print to bluetooth printer

eg:

Description Qty Rate Total
Ball pen 1 19 38.00
Notebook 12 100 1200.00

===========================
Total 1238.00


also need text alignment help while printing


any help will be appreciate
thanks in advance