private void setCropOverlayVisibility() {
    if (mCropOverlayView != null) {
      mCropOverlayView.setVisibility(mShowCropOverlay && mBitmap != null ? VISIBLE : INVISIBLE);
    }
  }
Set visibility of crop overlay to hide it when there is no image or specificly set by client.
core/src/main/java/com/theartofdev/edmodo/cropper/CropImageView.java