mprinter | Various tools for mPrinter printer | 3D Printing library

This code has the contents of the invoice to be printed in a string, and could certainly edit that string prior to printing it. So it seems on the surface that you could certainly do what you're asking via this code.

I wonder, however, if this is where you should be doing this. This code seems to be responsible for printing a document without having to know anything about its content, or even the file type. For this code to make changes to the document, it will have to take on a whole new role and understand the format and contents of the documents it's printing.

There is not enough information here to allow any specific guidance on where this logic that modifies the contents of the document should go. My gut says it doesn't belong here...that there might be somewhere earlier in the process that already has knowledge of the contents of the document, and that the modifications you are seeking to make should be applied there. But if this is the only place these changes can be made, there's no reason I can see that this code couldn't modify the string it is given in pretty much any conceivable way before printing it. It would just need to know enough to do so properly, which again, is a function of specifics not provided here.

The issue is,

a) Currently material dialog has it's own layout with

.customView(R.layout.test, false)

and you also have your own layout from which you are initializing RecyclerView

Looks like you don't have the proper permissions in your manifest. Try putting these in your project under the manifest tag:

They also have the

permission but I'm not sure you need it. I think the essentials are Bluetooth and Internet permissions.

once Check the [Epson ePOS SDK for Android User Manual][1]

You Need to Download There Is no Display Option

After that go to

1. Printer selection (class initialization) Initialize the Printer class and select the printer to control.

You will see this...