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Create Unicode text or embed composite fonts in PDF files using Java (Android)

Sample Java (Android) code for using PDFTron SDK to create Unicode text and embed composite fonts in PDF files.

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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.Element;
import com.pdftron.pdf.ElementBuilder;
import com.pdftron.pdf.ElementWriter;
import com.pdftron.pdf.Font;
import com.pdftron.pdf.PDFDoc;
import com.pdftron.pdf.Page;
import com.pdftron.pdf.Rect;
import com.pdftron.sdf.SDFDoc;

import java.util.ArrayList;

/**
 * This example illustrates how to create Unicode text and how to embed
 * composite fonts.
 * <p>
 * Note: This sample assumes that your device contains some of the regular
 * fonts distributed with the Android SDK. Since not all fonts are shipped
 * depending on the manufacturer, you may need to change the sample code
 * or add a font that covers the text you want to use.
 * <p>
 * In case some of the text used in this sample does not work properly
 * (squared or dot characters appear instead of the real characters) you can
 * search for the correct fonts in the Android SDK or download and use the
 * Cyberbit font, available here:
 * http://ftp.netscape.com/pub/communicator/extras/fonts/windows/
 * <p>
 * Add the font file to the assets\TestFiles folder and change the code
 * accordingly.
 */
public class UnicodeWriteTest extends PDFNetSample {

	private static OutputListener mOutputListener;

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

    public UnicodeWriteTest() {
        setTitle(R.string.sample_unicodewrite_title);
        setDescription(R.string.sample_unicodewrite_description);
    }

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

        try {
            PDFDoc doc = new PDFDoc();

            ElementBuilder eb = new ElementBuilder();
            ElementWriter writer = new ElementWriter();

            // Start a new page ------------------------------------
            Page page = doc.pageCreate(new Rect(0, 0, 612, 794));

            writer.begin(page);    // begin writing to this page

            Font fnt;
            try {
                // Embed and subset the font
                fnt = Font.createCIDTrueTypeFont(doc, Utils.getAssetTempFile(INPUT_PATH + "arialuni.ttf").getAbsolutePath(), true, true);
            } catch (Exception e) {
                mOutputListener.printError(e.getStackTrace());
                mOutputListener.println("Note: The font file was not found");
                return;
            }

            Element element = eb.createTextBegin(fnt, 1);
            element.setTextMatrix(10, 0, 0, 10, 50, 600);
            element.getGState().setLeading(2);         // Set the spacing between lines
            writer.writeElement(element);

            // Hello World!
            char hello[] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!'};
            writer.writeElement(eb.createUnicodeTextRun(new String(hello)));
            writer.writeElement(eb.createTextNewLine());

            // Latin
            char latin[] = {
                    'a', 'A', 'b', 'B', 'c', 'C', 'd', 'D', 0x45, 0x0046, 0x00C0,
                    0x00C1, 0x00C2, 0x0143, 0x0144, 0x0145, 0x0152, '1', '2' // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(latin)));
            writer.writeElement(eb.createTextNewLine());

            // Greek
            char greek[] = {
                    0x039E, 0x039F, 0x03A0, 0x03A1, 0x03A3, 0x03A6, 0x03A8, 0x03A9  // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(greek)));
            writer.writeElement(eb.createTextNewLine());

            // Cyrillic
            char cyrilic[] = {
                    0x0409, 0x040A, 0x040B, 0x040C, 0x040E, 0x040F, 0x0410, 0x0411,
                    0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417, 0x0418, 0x0419 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(cyrilic)));
            writer.writeElement(eb.createTextNewLine());

            // Hebrew
            char hebrew[] = {
                    0x05D0, 0x05D1, 0x05D3, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7, 0x05D8,
                    0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF, 0x05E0, 0x05E1 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(hebrew)));
            writer.writeElement(eb.createTextNewLine());

            // Arabic
            char arabic[] = {
                    0x0624, 0x0625, 0x0626, 0x0627, 0x0628, 0x0629, 0x062A, 0x062B, 0x062C,
                    0x062D, 0x062E, 0x062F, 0x0630, 0x0631, 0x0632, 0x0633, 0x0634, 0x0635 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(arabic)));
            writer.writeElement(eb.createTextNewLine());

            // Thai
            char thai[] = {
                    0x0E01, 0x0E02, 0x0E03, 0x0E04, 0x0E05, 0x0E06, 0x0E07, 0x0E08, 0x0E09,
                    0x0E0A, 0x0E0B, 0x0E0C, 0x0E0D, 0x0E0E, 0x0E0F, 0x0E10, 0x0E11, 0x0E12 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(thai)));
            writer.writeElement(eb.createTextNewLine());

            // Hiragana - Japanese
            char hiragana[] = {
                    0x3041, 0x3042, 0x3043, 0x3044, 0x3045, 0x3046, 0x3047, 0x3048, 0x3049,
                    0x304A, 0x304B, 0x304C, 0x304D, 0x304E, 0x304F, 0x3051, 0x3051, 0x3052 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(hiragana)));
            writer.writeElement(eb.createTextNewLine());

            // CJK Unified Ideographs
            char cjk_uni[] = {
                    0x5841, 0x5842, 0x5843, 0x5844, 0x5845, 0x5846, 0x5847, 0x5848, 0x5849,
                    0x584A, 0x584B, 0x584C, 0x584D, 0x584E, 0x584F, 0x5850, 0x5851, 0x5852 // etc.
            };
            writer.writeElement(eb.createUnicodeTextRun(new String(cjk_uni)));
            writer.writeElement(eb.createTextNewLine());

            // Finish the block of text
            writer.writeElement(eb.createTextEnd());

            writer.end();  // save changes to the current page
            doc.pagePushBack(page);

            doc.save(Utils.createExternalFile("unicodewrite.pdf", mFileList).getAbsolutePath(), new SDFDoc.SaveMode[]{SDFDoc.SaveMode.REMOVE_UNUSED, SDFDoc.SaveMode.HEX_STRINGS}, null);
            doc.close();
            mOutputListener.println("Done. Result saved in unicodewrite.pdf...");
        } catch (Exception e) {
            mOutputListener.printError(e.getStackTrace());
        }

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

}
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