PDFJet is a popular Java library that has been widely adopted in the B4A community. There are several wrappers available for B4A that make implementing PDFJet straightforward.
Sub PrintPDF(FilePath As String) Dim pm As PrintManager pm.Initialize 'Create a PrintDocumentAdapter Dim pda As JavaObject pda.InitializeNewInstance("android.print.PrintDocumentAdapter", Null) b4a pdf
Before diving into code, it is essential to understand that B4A itself does not ship with a single "magic" PDF library. Instead, developers have several robust options: PDFJet is a popular Java library that has