Sorry for the late reply. I had other issues to solve and I wasn't able to come back to this problem.
I updated my RadaeeLib version and still have the same problems.
I'm using the following code to sign the Signature Field.
Document.DocForm form = CommonUtil.createImageForm(documento, signature, annotWidth, annotHeight);
File downloads = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
String certificado = downloads.getAbsolutePath() + "/file.p12";
m_annot.SignField(form, certificado, "123456", "ITGreen", "", "", "");
'signature' is a bitmap gerenated from a Wacom service that we use for capture signatures in our project.
I think the problem might be with 'createImageForm'. I'm not sure.
What do you think?