finding out required fields to fill in pdf file

Question

I\'m starting with new functionality in my android application which will help to fill certain PDF forms.

I find out that the best solution will be to use iText library.

Answer 1

check required fields without looping for itext5.

        String src = "yourpath/pdf1.pdf";
        String dest = "yourpath/pdf2.pdf";

        PdfReader reader = new PdfReader(src);
        PdfStamper stamper = new PdfStamper(this.reader, new FileOutputStream(dest));

        AcroFields form = this.stamper.getAcroFields();
        Map fields = form.getFields();
        AcroFields.Item item;
        PdfDictionary dict;
        PdfNumber flags;
        item=fields.get("fieldName");
        dict = item.getMerged(0);
        flags = dict.getAsNumber(PdfName.FF);
        if (flags != null && (flags.intValue() & BaseField.REQUIRED) > 0) 
        {
                System.out.println("flag  has set");
        }