Add Watermarks to PDF in Xamarin.Android

The WatermarkDialog allows you to stamp a PDF document with text that overlays each page of the document.

The watermark editor can be shown from an activity by calling the following method:

public void ShowWatermarkDialog(PDFViewCtrl pdfViewCtrl, FragmentManager fragmentManager)
{
    var fragment =pdftron.PDF.Dialog.Watermark.WatermarkDialog.NewInstance(pdfViewCtrl);
    fragment.Show(fragmentManager);
}