This article shows you how to disable swipe gesture for single/dual view mode on Android.

You have to edit PDFLayoutView.onTouchNone method as follow : 

private boolean onTouchNone(MotionEvent event)
      {....
      case MotionEvent.ACTION_MOVE:
      if(m_hold && m_layout.vGetScale() > m_layout.vGetMinScale()) {
      m_layout.vSetX((int) (m_hold_docx + m_hold_x - event.getX()));
      m_layout.vSetY((int) (m_hold_docy + m_hold_y - event.getY()));
      invalidate();
      }
      break;
      case MotionEvent.ACTION_UP:
      case MotionEvent.ACTION_CANCEL:
      if(m_hold && m_layout.vGetScale() > m_layout.vGetMinScale()) {....

You have to edit PDFGestureListener.onFling as follow :  

class PDFGestureListener extends GestureDetector.SimpleOnGestureListener
{
   @Override
   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
   {
      if(m_layout == null) return false;
      if(m_status == STA_NONE && m_hold && m_layout.vGetScale() > m_layout.vGetMinScale())
      {....

This will block the scroll and fling while the page is not zoomed. 

If you need to block the page while zoomed, please check : Avoid page change during navigation while zoomed (Android)