code: public void zoomPrevious() {
  		if (hasPrevious()) {
  			next.addFirst(previous.remove());
  			MapViewChangedEvent data = previous.peek();
  			active = false;
  			mapView.applyBounds(data.getBounds(), MapView.ZoomOption.LEVEL_CLOSEST);
  			updateActionsAbility();
  		}
  	}
docs: Zoom to the previous level.