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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 PdfViewCtrlTabHostFragment. 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 signature is then saved to a separate file.
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