如何在Android中使用iText创建的PDF中显示阿拉伯语

Question

我正在使用iText 5.5.10创建PDF。当我使用英语单词时，它可以很好地工作，但是当我使用阿拉伯语单词时，它可以显示空行。

问题出在哪里，我该如何解决？预先感谢。

public void createPDF1(View view) throws IOException, DocumentException {
    //    BaseFont urName = BaseFont.createFont("assets/subFolder/fontName.TTF", "UTF-8",BaseFont.EMBEDDED);
    //    Font urFontName = new Font(urName, 12);
    Font font = FontFactory.getFont("Simplified Arabic", BaseFont.IDENTITY_H, true, 22, Font.BOLD);

    EditText et=(EditText)findViewById(R.id.txt_input);
    BaseFont ArialBase = BaseFont.createFont("assets/tahoma.ttf", BaseFont.IDENTITY_H, true);
    Font ArialFont = new Font(ArialBase, 20);

    //  Font f = FontFactory.getFont(FONT, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
    Font chapterFont = FontFactory.getFont("assets/arialuni.ttf", BaseFont.IDENTITY_H, 16, Font.BOLDITALIC);
    Font f=new Font(Font.FontFamily.TIMES_ROMAN,50.0f,Font.UNDERLINE,BaseColor.RED);
    Document document = new Document();

    String outpath= Environment.getExternalStorageDirectory()+"/mypdf1.pdf";

    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outpath));
    document.open();

    Phrase p = new Phrase("This is incorrect:احمد",ArialFont);
    p.add(new Chunk("احمد",ArialFont));
    p.add(new Chunk(": 50.00 USD"));
    document.add(p);

    p = new Phrase("This is correct: ");
    p.add(new Chunk("#"+et.getText().toString(),chapterFont));
    p.add(new Phrase(": 50.00"));

    ColumnText canvas = new ColumnText(writer.getDirectContent());
    canvas.setSimpleColumn(36, 750, 559, 780);
    canvas.setRunDirection(PdfWriter.RUN_DIRECTION_LTR);
    canvas.addElement(p);
    canvas.go();

    document.close();
}

我已经尝试过this post中的建议，但这是行不通的。