public ActivityBuilder setShowCropOverlay(boolean showCropOverlay) {
      mOptions.showCropOverlay = showCropOverlay;
      return this;
    }
if to show crop overlay UI what contains the crop window UI surrounded by background over the
cropping image.<br>
<i>default: true, may disable for animation or frame transition.</i>
core/src/main/java/com/theartofdev/edmodo/cropper/CropImage.java