title: pdfrender android parcefiledescriptor from buffer byte array
body: <p>I have a pdf into a byte array buffer.
  I would like to open it with PdfRender in Android, but PdfRender accepts only in the constructor ParcelFileDescriptor.</p>
  
  <pre><code> Java.IO.File f = new Java.IO.File (pdfPathfile);
   ParcelFileDescriptor fileDescriptor = ParcelFileDescriptor.Open (f, ParcelFileMode.ReadOnly);
   var mPdfRenderer = new PdfRenderer (fileDescriptor);
  </code></pre>
  
  <p>I would not want to save the buffer to a file. How can I use it directly?
  Thanks.</p>