The RotateDialogFragment allows users to rotate pages of the opened document by 90, 180 and 270 degrees. It also displays a thumbnail of the current page at the selected rotation angle.

To show a rotate pages dialog in your activity, create a new instance of RotateDialogFragment by calling newInstance() and setting the PDFViewCtrl:

public void showRotateDialog()
{
    pdftron.PDF.Dialog.RotateDialogFragment.NewInstance()
        .SetPdfViewCtrl(mPdfViewCtrl)
        .Show(this.SupportFragmentManager, "rotate_pages_dialog");
}