code: public void update(boolean animate) {
          final Settings settings =
                  imageView == null ? null : imageView.getController().getSettings();
  
          if (settings != null && getWidth() > 0 && getHeight() > 0) {
  
              // If aspect is specified we will automatically adjust movement area settings
              if (aspect > 0f || aspect == ORIGINAL_ASPECT) {
                  final int width = getWidth() - getPaddingLeft() - getPaddingRight();
                  final int height = getHeight() - getPaddingTop() - getPaddingBottom();
  
                  final float realAspect = aspect == ORIGINAL_ASPECT
                          ? settings.getImageW() / (float) settings.getImageH() : aspect;
  
                  // Setting movement area
                  if (realAspect > (float) width / (float) height) {
                      // Cropping area is wider
                      settings.setMovementArea(width, (int) (width / realAspect));
                  } else {
                      // Cropping area is higher
                      settings.setMovementArea((int) (height * realAspect), height);
                  }
  
                  // Animating image to fit new movement area
                  if (animate) {
                      imageView.getController().animateKeepInBounds();
                  } else {
                      imageView.getController().updateState();
                  }
              }
  
              startRect.set(areaRect);
  
              GravityUtils.getMovementAreaPosition(settings, tmpRect);
              endRect.set(tmpRect);
  
              stateScroller.forceFinished();
  
              if (animate) {
                  stateScroller.setDuration(settings.getAnimationsDuration());
                  stateScroller.startScroll(0f, 1f);
                  animationEngine.start();
              } else {
                  setBounds(endRect, endRounding);
              }
          }
      }
docs: Applies area size, area position and corners rounding with optional animation.
  
  @param animate Whether to animate changes when applying new cropping area settings