(Android/Kotlin) Write unlimited number of lines to PDF (A4).

pdfwriter.kt

    fun createAndWritePdf() {
      initPdfDocument()
      writeToPdfDocument("One line...")
      writeToPdfDocument("Another line...")
      closePdfDocument()
      savePdfDocument()
    }


    lateinit var document : PdfDocument
    lateinit var pageInfo: PdfDocument.PageInfo
    lateinit var page: PdfDocument.Page
    lateinit var canvas : Canvas
    lateinit var paint : Paint
    val textSize = 16F
    val marginLeft = 8F
    var y = textSize
    val pageHeight = 842
    val pageWidth = 595
    var currentPage = 1

    fun initPdfDocument() {
        document = PdfDocument()

        pageInfo = PdfDocument.PageInfo.Builder(pageWidth, pageHeight, currentPage).create()
        page = document.startPage(pageInfo)

        canvas = page.canvas
        paint = Paint()

        paint.color = Color.BLACK
        paint.textSize = textSize
    }

    fun writeToPdfDocument(strToWrite: String) {

        if (y > pageHeight) {
            document.finishPage(page)
            currentPage++
            pageInfo = PdfDocument.PageInfo.Builder(pageWidth, pageHeight, currentPage).create()
            page = document.startPage(pageInfo)
            canvas = page.canvas
            y = textSize
        }

        canvas.drawText(strToWrite, marginLeft, y, paint)
        y += textSize
    }

    fun closePdfDocument() {
        document.finishPage(page)
    }

    fun savePdfDocument() {
        val directory = Environment.getExternalStorageDirectory().path + "/MyPdfOutputDir/"
        val file = File(directory)
        if (!file.exists())
        {
            val result = file.mkdirs()
        }
        val targetPdf = directory + "MyFilename.pdf"
        val filePath = File(targetPdf)
        try {
            document.writeTo(FileOutputStream(filePath))
        } catch (t: Throwable) {
        }

        document.close()
    }