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Search & replace PDF text or images in Kotlin

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Sample Kotlin code to use PDFTron SDK for searching and replacing text strings and images inside existing PDF files (e.g. business cards and other PDF templates). Unlike PDF forms, the ContentReplacer works on actual PDF content and is not limited to static rectangular annotation regions. Learn more about our Kotlin PDF Library and PDF Editing & Manipulation Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

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.pdf.ContentReplacer
import com.pdftron.pdf.Image
import com.pdftron.pdf.PDFDoc
import com.pdftron.sdf.SDFDoc
import java.util.*

class ContentReplacerTest : PDFNetSample() {
    init {
        setTitle(R.string.sample_contentreplacer_title)
        setDescription(R.string.sample_contentreplacer_description)
    }

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

        // The first step in every application using PDFNet is to initialize the
        // library and set the path to common PDF resources. The library is usually
        // initialized only once, but calling Initialize() multiple times is also fine.

        //--------------------------------------------------------------------------------
        // Example 1) Update a business card template with personalized info

        try {
            val doc = PDFDoc(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "BusinessCardTemplate.pdf")!!.absolutePath)
            doc.initSecurityHandler()

            val replacer = ContentReplacer()
            val page = doc.getPage(1)
            // first, replace the image on the first page
            val img = Image.create(doc, Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "peppers.jpg")!!.absolutePath)
            replacer.addImage(page.mediaBox, img.sdfObj)
            // next, replace the text place holders on the second page
            replacer.addString("NAME", "John Smith")
            replacer.addString("QUALIFICATIONS", "Philosophy Doctor")
            replacer.addString("JOB_TITLE", "Software Developer")
            replacer.addString("ADDRESS_LINE1", "#100 123 Software Rd")
            replacer.addString("ADDRESS_LINE2", "Vancouver, BC")
            replacer.addString("PHONE_OFFICE", "604-730-8989")
            replacer.addString("PHONE_MOBILE", "604-765-4321")
            replacer.addString("EMAIL", "info@pdftron.com")
            replacer.addString("WEBSITE_URL", "http://www.pdftron.com")
            // finally, apply
            replacer.process(page)

            doc.save(Utils.createExternalFile("BusinessCard.pdf", mFileList).absolutePath, SDFDoc.SaveMode.REMOVE_UNUSED, null)
            doc.close()
            mOutputListener!!.println("Done. Result saved in BusinessCard.pdf")
        } catch (e: Exception) {
            mOutputListener!!.printError(e.stackTrace)
            return
        }

        //--------------------------------------------------------------------------------
        // Example 2) Replace text in a region with new text

        try {
            val doc = PDFDoc(Utils.getAssetTempFile(PDFNetSample.INPUT_PATH + "newsletter.pdf")!!.absolutePath)
            doc.initSecurityHandler()

            val replacer = ContentReplacer()
            val page = doc.getPage(1)
            val target_region = page.mediaBox
            val replacement_text = "hello hello hello hello hello hello hello hello hello hello"
            replacer.addText(target_region, replacement_text)
            replacer.process(page)

            doc.save(Utils.createExternalFile("ContentReplaced.pdf", mFileList).absolutePath, SDFDoc.SaveMode.REMOVE_UNUSED, null)
            doc.close()
            mOutputListener!!.println("Done. Result saved in ContentReplaced.pdf")
        } catch (e: Exception) {
            mOutputListener!!.printError(e.stackTrace)
            return
        }

        mOutputListener!!.println("Done.")

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

    companion object {

        private var mOutputListener: OutputListener? = null

        private val mFileList = ArrayList<String>()
    }

}