Display PDF document in android application

The simplest solution I'm aware of, if there's a PDF viewer already installed, would be to save your byte array to file and request display of the file.

Something like this...

// Java. If you're working with a C# 'droid tool you may need to tinker with the
//       syntax.

// filePath the name and directory where the byte array was saved.
File pdfFile = new File(filePath);

if (pdfFile.exists()) {
  Uri path = Uri.fromFile(pdfFile);
  Intent intent = new Intent(Intent.ACTION_VIEW);
  intent.setDataAndType(path, "application/pdf");
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  // If requesting from a fragment...
  getActivity().startActivity(intent);
  // If requesting from an activity...
  // this.startActivity(intent);
}

Of course you then need to tidy away the file when the PDF viewer activity is done. It may be possible to do this using startActivityForResult instead of startActivity.