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PDFTron SDK for Xamarin.Android provides a the functionality to add digital signatures with UI.
The Tools package comes with a basic
DigitalSignature tool that allows signing with a specific keystore and password. The
DigitalSignature tool can be used with the UI components such as DocumentActivity and PdfViewCtrlTabHostFragment2 . You can also use the tool with PDFViewCtrl through ToolManager .
By default, the signature tool does not sign with a certificate. Certificate-based signatures can be enabled using
ToolManagerBuilder which will add a certificate picker and password input field to the signature UI flow.
Alternatively you can define a certificate file and password in
ToolManagerBuilder. This will disable the additional signing flow for digital signatures and use the specified certificate instead.
var tmBuilder = ToolManagerBuilder.From() .SetUseDigitalSignature(true) // Optionally specify a default certificate file and password .SetDigitalSignatureKeystorePath("my_keystore_path") .SetDigitalSignatureKeystorePassword("my_keystore_password") var builder = ViewerConfig.Builder() var config = builder //... .ToolManagerBuilder(tmBuilder) .Build()
The signed document is then saved to a separate file.
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