Seperate arabic character issue

try {
                    PDDocument document = new PDDocument();
                    
                    PDFont font =  PDType0Font.load(document, getAssets().open("fonts/tahoma.ttf") );

                    for (int i = 0; i < images.size(); i++) {
                        if (!images.get(i).equals("")) {
                            PDPage page = new PDPage(PDRectangle.A4);
                            Log.e("debug","code pos 1");
                            // page.set
                            document.addPage(page);

                            PDPageContentStream contentStream = new PDPageContentStream(document, page);

                            contentStream.beginText();
                            contentStream.setFont(font, 12);
                            contentStream.setLeading(12 * 1.2);

                            contentStream.newLineAtOffset(50, 600);
                            contentStream.showText("اسلام علیکم 1"); // printed : ا س ل ا م ع ل ی ک م 1
                            contentStream.newLine();
							
                            contentStream.endText();

                            contentStream.close();
							....