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Kotlin PDF converter (SVG, XPS, TIFF, JPG, RTF, TXT, more)

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Sample Kotlin code to use PDFTron SDK for direct, high-quality conversion between PDF, XPS, EMF, SVG, TIFF, PNG, JPEG, and other image formats ('pdftron.PDF.Convert' namespace). The sample also shows how to convert any printable document (ex. TXT, RTF, Word, HTML, MS Office, DXF, DWG, etc) to PDF or XPS using a universal document converter. Learn more about our Kotlin PDF Library and PDF Conversion Library.

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package com.pdftron.android.pdfnetsdksamples.samples

import com.pdftron.android.pdfnetsdksamples.OutputListener
import com.pdftron.android.pdfnetsdksamples.PDFNetSample
import com.pdftron.android.pdfnetsdksamples.R
import com.pdftron.android.pdfnetsdksamples.util.Utils
import com.pdftron.common.PDFNetException
import com.pdftron.pdf.Convert
import com.pdftron.pdf.PDFDoc
import com.pdftron.sdf.ObjSet
import com.pdftron.sdf.SDFDoc
import java.util.ArrayList

class ConvertTest : PDFNetSample() {
    init {
        setTitle(R.string.sample_convert_title)
        setDescription(R.string.sample_convert_description)
    }

    override fun run(outputListener: OutputListener?) {
        super.run(outputListener)
        mOutputListener = outputListener
        mFileList.clear()
        printHeader(outputListener!!)

        var outputFile: String

        mOutputListener!!.println("-------------------------------------------------")

        try {
            mOutputListener!!.println("Converting Text to PDF with options")
            val objset = ObjSet()
            val options = objset.createDict()
            options.putNumber("FontSize", 15.0)
            options.putBool("UseSourceCodeFormatting", true)
            options.putNumber("PageWidth", 12.0)
            options.putNumber("PageHeight", 6.0)
            val doc = PDFDoc()
            outputFile = Utils.createExternalFile("simple-text.pdf", mFileList).absolutePath
            Convert.fromText(doc, Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "simple-text.txt")!!.absolutePath, options)
            doc.save(outputFile, SDFDoc.SaveMode.LINEARIZED, null)
            mOutputListener!!.println("Result saved in $outputFile")
            doc.close()
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert Plain Text document to PDF, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert the XPS document to PDF
        try {
            mOutputListener!!.println("Converting XPS document to PDF")
            val doc = PDFDoc()
            Convert.fromXps(doc, Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "simple-xps.xps")!!.absolutePath)
            outputFile = Utils.createExternalFile("xps2pdf_Java.pdf", mFileList).absolutePath
            doc.save(outputFile, SDFDoc.SaveMode.LINEARIZED, null)
            mOutputListener!!.println("Result saved in $outputFile")
            doc.close()
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert XPS document to PDF, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert the PDF document to SVG
        try {
            mOutputListener!!.println("Converting XPS document to SVG")
            val doc = PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "tiger.pdf")!!.absolutePath)
            Convert.fromXps(doc, Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "simple-xps.xps")!!.absolutePath)
            mOutputListener!!.println("Converting PDF document to SVG")
            outputFile = Utils.createExternalFile("pdf2svg_Java.svg", mFileList).absolutePath
            Convert.toSvg(doc, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
            doc.close()
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to SVG, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert the PDF document to XPS
        try {
            mOutputListener!!.println("Converting PDF document to XPS")
            val doc = PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf")!!.absolutePath)
            outputFile = Utils.createExternalFile("pdf2xps_Java.xps", mFileList).absolutePath
            Convert.toXps(doc, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
            doc.close()
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to SVG, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert an image to PDF using internal converter
        try {
            mOutputListener!!.println("Converting PNG image to PDF")
            val doc = PDFDoc()
            Convert.toPdf(doc, Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "butterfly.png")!!.absolutePath)
            outputFile = Utils.createExternalFile("png2pdf_Java.pdf", mFileList).absolutePath
            doc.save(outputFile, SDFDoc.SaveMode.LINEARIZED, null)
            mOutputListener!!.println("Result saved in $outputFile")
            doc.close()
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PNG image to XPS, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert an image to XPS using internal converter
        try {
            mOutputListener!!.println("Converting PNG image to XPS")
            outputFile = Utils.createExternalFile("buttefly_Java.xps", mFileList).absolutePath
            Convert.toXps(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "butterfly.png")!!.absolutePath, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PNG image to XPS, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert a PDF document directly to XPS
        try {
            mOutputListener!!.println("Converting PDF to XPS")
            outputFile = Utils.createExternalFile("newsletter.xps", mFileList).absolutePath
            Convert.toXps(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "newsletter.pdf")!!.absolutePath, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to XPS, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert a PDF document to HTML
        try {
            mOutputListener!!.println("Converting PDF to HTML")
            outputFile = Utils.createExternalFile("newsletter", mFileList).absolutePath
            Convert.toHtml(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "newsletter.pdf")!!.absolutePath, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to HTML, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert a PDF document to EPUB
        try {
            mOutputListener!!.println("Converting PDF to EPUB")
            outputFile = Utils.createExternalFile("newsletter.epub", mFileList).absolutePath
            Convert.toEpub(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "newsletter.pdf")!!.absolutePath, outputFile)
            mOutputListener!!.println("Result saved in $outputFile")
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to EPUB, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        // Convert a PDF document to multipage TIFF
        try {
            mOutputListener!!.println("Converting PDF to multipage TIFF")
            outputFile = Utils.createExternalFile("newsletter.tiff", mFileList).absolutePath
            val tiff_options = Convert.TiffOutputOptions()
            tiff_options.setDPI(200.0)
            tiff_options.setMono(true)
            tiff_options.setDither(true)
            Convert.toTiff(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "newsletter.pdf")!!.absolutePath, outputFile, tiff_options)
            mOutputListener!!.println("Result saved in $outputFile")
        } catch (e: PDFNetException) {
            mOutputListener!!.println("Unable to convert PDF document to TIFF, error:")
            mOutputListener!!.printError(e.stackTrace)
        }

        mOutputListener!!.println("Done.")

        for (file in mFileList) {
            addToFileList(file)
        }
        printFooter(outputListener)
    }

    companion object {

        private var mOutputListener: OutputListener? = null

        private val mFileList = ArrayList<String>()
    }
}
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