@Override
    public final void startCrop(@NonNull BaseMedia media, int requestCode) {
        BoxingCropOption cropConfig = BoxingManager.getInstance().getBoxingConfig().getCropOption();
        BoxingCrop.getInstance().onStartCrop(getActivity(), this, cropConfig, media.getPath(), requestCode);
    }
to start the crop behavior, call it when {@link #hasCropBehavior()} return true.

@param media       the media to be cropped.
@param requestCode The integer request code originally supplied to
                   startActivityForResult(), allowing you to identify who this
                   result came from.
boxing/src/main/java/com/bilibili/boxing/AbsBoxingViewFragment.java