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Generate page thumbnails

This tutorial only applies to Xamarin.Android.
PDFTron's library provides a page thumbnail dialog which shows thumbnails of all PDF document pages. Fore more information, see thumbnail browser.

With PDFViewCtrl, you can get a thumbnail Bitmap image for each page in a PDF document.

The following example request thumbnail for page 3:

pdfViewCtrl.ThumbAsync += (sender, e) =>
{
    var bitmap = Bitmap.CreateBitmap(e.Width, e.Height, Bitmap.Config.Argb8888);
    // use the bitmap
}

where pdfViewCtrl is an instance of PDFViewCtrl.

It is recommended you cancel all thumbnail requests once they are no longer needed. To cancel all thumbnail request, use PDFViewCtrl.CancelAllThumbRequests().

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