Here's code that does not use appearance stream (rather, these are dummy):
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
document.addPage(page);
PDAcroForm acroForm = new PDAcroForm(document);
acroForm.setNeedAppearances(true);
acroForm.setXFA(null);
document.getDocumentCatalog().setAcroForm(acroForm);
PDFont font = PDType1Font.HELVETICA;
PDResources res = new PDResources();
COSName fontName = res.add(font);
acroForm.setDefaultResources(res);
acroForm.setDefaultAppearance('/' + fontName.getName() + "
10 Tf 0 g");
PDPageContentStream contents = new
PDPageContentStream(document, page);
List<String> options = Arrays.asList("a", "b", "c");
PDRadioButton radioButton = new PDRadioButton(acroForm);
radioButton.setPartialName("RadioButtonParent");
//radioButton.setExportValues(options);
radioButton.getCOSObject().setName(COSName.DV, options.get(1));
radioButton.setFieldFlags(49152);
int on = 1;
List<PDAnnotationWidget> widgets = new ArrayList<>();
for (int i = 0; i < options.size(); i++)
{
PDAppearanceCharacteristicsDictionary fieldAppearance =
new PDAppearanceCharacteristicsDictionary(new COSDictionary());
fieldAppearance.setBorderColour(new PDColor(new float[]
{ 0, 0, 0 }, PDDeviceRGB.INSTANCE));
//PDAnnotationWidget widget =
subRadioButtons.getWidgets().get(0);
PDAnnotationWidget widget = new PDAnnotationWidget();
widget.setRectangle(new PDRectangle(30, 811 - i * (21),
16, 16));
widget.setAppearanceCharacteristics(fieldAppearance);
widget.setAnnotationFlags(4);
widget.setPage(page);
widget.setParent(radioButton);
COSDictionary apNDict = new COSDictionary();
COSStream offNStream = new COSStream();
offNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offNStream.setItem(COSName.TYPE, COSName.XOBJECT);
offNStream.setItem(COSName.SUBTYPE, COSName.FORM);
apNDict.setItem(COSName.Off, offNStream);
COSStream onNStream = new COSStream();
onNStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onNStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onNStream.setItem(COSName.TYPE, COSName.XOBJECT);
onNStream.setItem(COSName.SUBTYPE, COSName.FORM);
apNDict.setItem(options.get(i), onNStream);
COSDictionary apDDict = new COSDictionary();
COSStream offDStream = new COSStream();
offDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
offDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
offDStream.setItem(COSName.TYPE, COSName.XOBJECT);
offDStream.setItem(COSName.SUBTYPE, COSName.FORM);
apDDict.setItem(COSName.Off, offDStream);
COSStream onDStream = new COSStream();
onDStream.setItem(COSName.BBOX, new PDRectangle(16, 16));
onDStream.setItem(COSName.FORMTYPE, COSInteger.ONE);
onDStream.setItem(COSName.TYPE, COSName.XOBJECT);
onDStream.setItem(COSName.SUBTYPE, COSName.FORM);
apDDict.setItem(options.get(i), onDStream);
PDAppearanceDictionary appearance = new
PDAppearanceDictionary();
PDAppearanceEntry appearanceNEntry = new
PDAppearanceEntry(apNDict);
appearance.setNormalAppearance(appearanceNEntry);
PDAppearanceEntry appearanceDEntry = new
PDAppearanceEntry(apDDict);
appearance.setDownAppearance(appearanceDEntry);
widget.setAppearance(appearance);
widget.setAppearanceState(i == on ? options.get(i) :
"Off");
widgets.add(widget);
page.getAnnotations().add(widget);
contents.beginText();
contents.setFont(font, 10);
contents.newLineAtOffset(56, 811 - i * (21) + 4);
contents.showText(options.get(i));
contents.endText();
}
radioButton.setWidgets(widgets);
acroForm.getFields().add(radioButton);
radioButton.setValue("b");
contents.close();
try (FileOutputStream output = new
FileOutputStream("test.pdf"))
{
document.save(output);
}
document.close();
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