Section:

Sign a PDF document in Android

To sign an existing approval signature field in a PDF Document:

1PDFDoc doc = new PDFDoc(docpath);
2
3// Retrieve the unsigned approval signature field.
4Field found_approval_field = doc.getField(approval_field_name);
5DigitalSignatureField approval_digsig_field = new DigitalSignatureField(found_approval_field);
6
7// (OPTIONAL) Add more information to the signature dictionary.
8approval_digsig_field.setLocation("Vancouver, BC");
9approval_digsig_field.setReason("Document approval.");
10approval_digsig_field.setContactInfo("www.apryse.com");
11
12// (OPTIONAL) Add an appearance to the signature field.
13Image img = Image.create(doc, appearance_img_path);
14SignatureWidget approval_signature_widget = new SignatureWidget(found_approval_field.getSDFObj());
15approval_signature_widget.createSignatureAppearance(img);
16
17// Prepare the signature and signature handler for signing.
18approval_digsig_field.signOnNextSave(private_key_file_path, keyfile_password);
19
20// The actual approval signing will be done during the following incremental save operation.
21doc.save(outpath, SDFDoc.SaveMode.INCREMENTAL, null);

Digitally sign PDF files
Full code sample which demonstrates using the digital signature API to digitally sign and/or certify PDF documents.

About Adding An Approval Signature to a PDF Document

The Apryse SDK enables approval signatures in PDF documents using a Digital Certificate, in accordance with the latest PDF specification. By leveraging public key infrastructure (PKI) technology, with a certificate issued by a trusted certificate authority (CA), a signer can use a certificate-based digital ID to guarantee the authenticity of a signature. Placement of a digital signature using a certificate can also guarantee that a document was not modified since the signature was placed, ensuring the authenticity of the document.

Apryse Docs Image

Image taken from Apryse WebViewer

Above is an example of a document containing a certified signature, guaranteed by a certificate generated by Apryse.com.

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