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Read elements across all PDF pages in Java (Android)

Sample Java (Android) code for using PDFTron SDK to traverse the page display list using ElementReader. Learn more about our PDF Parsing & Content Extraction 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.common.PDFNetException;
import com.pdftron.pdf.Element;
import com.pdftron.pdf.ElementReader;
import com.pdftron.pdf.PDFDoc;
import com.pdftron.pdf.PageIterator;
import com.pdftron.pdf.PathData;

import java.util.ArrayList;

public class ElementReaderTest extends PDFNetSample {

	private static OutputListener mOutputListener;

	private static ArrayList<String> mFileList = new ArrayList<>();

    public ElementReaderTest() {
        setTitle(R.string.sample_elementreader_title);
        setDescription(R.string.sample_elementreader_description);
    }

	@Override
	public void run(OutputListener outputListener) {
		super.run(outputListener);
		mOutputListener = outputListener;
		mFileList.clear();
		printHeader(outputListener);

        try    // Extract text data from all pages in the document
        {
            mOutputListener.println("-------------------------------------------------");
            mOutputListener.println("Sample 1 - Extract text data from all pages in the document.");
            mOutputListener.println("Opening the input pdf...");

            PDFDoc doc = new PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf").getAbsolutePath());
            doc.initSecurityHandler();

            int pgnum = doc.getPageCount();

            PageIterator itr;
            ElementReader page_reader = new ElementReader();

            for (itr = doc.getPageIterator(); itr.hasNext(); )        //  Read every page
            {
                page_reader.begin(itr.next());
                ProcessElements(page_reader);
                page_reader.end();
            }

            //Close the open document to free up document memory sooner.
            doc.close();
            mOutputListener.println("Done.");
        } catch (Exception e) {
            mOutputListener.printError(e.getStackTrace());
        }

		for (String file : mFileList) {
			addToFileList(file);
		}
		printFooter(outputListener);
	}

    static void ProcessElements(ElementReader reader) throws PDFNetException {
        for (Element element = reader.next(); element != null; element = reader.next())    // Read page contents
        {
			switch (element.getType()) 
			{
				case Element.e_path:                 // Process path data...
				{
					PathData data = element.getPathData();
					byte[] operators = data.getOperators();
					double[] points = data.getPoints();
				}
				break;
				case Element.e_text:                // Process text strings...
				{
					String data = element.getTextString();
					mOutputListener.println(data); 
				}
				break;
				case Element.e_form:                // Process form XObjects
				{
					reader.formBegin();
					ProcessElements(reader);
					reader.end();
				}
				break;
			}
        }
    }

}
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