public override void LaunchExample(Context ctx, PdfActivityConfiguration.Builder configuration)
{
// Our test certificate is self-signed, so we need to add it to trusted certificate store for it to validate. Otherwise
// the new signature won't validate. Since PSPDFKit and other readers (like Acrobat) will warn when using self-signed certificates
// your app should use a CA issued certificate instead.
AddJohnAppleseedCertificateToTrustedCertificates(ctx);
// The signer is a named entity holding a certificate (usually a person) and has a display name shown in the app. Registration of the Signer instance
// has to happen using a unique string identifier. The signer can be associated with a signature for signing the document.
var johnAppleseed = new Pkcs12Signer("John Appleseed", Android.Net.Uri.Parse("file:///android_asset/JohnAppleseed.p12"));
SignatureManager.AddSigner("john_appleseed", johnAppleseed);
// Load and show the signature example PDF.
// Extract the pdf from assets if not already extracted
var docUri = Utils.ExtractAsset(ctx, AssetPath);
var intent = PdfActivityIntentBuilder.FromUri(ctx, docUri)
.Configuration(configuration.Build())
.Build();
ctx.StartActivity(intent);
}