public Uri onCropFinish(int resultCode, Intent data) {
        if (ensureLoader()) {
            throw new IllegalStateException("init method should be called first");
        }
        return mCrop.onCropFinish(resultCode, data);
    }
A loader holding {@link IBoxingCrop} to crop images.

@author ChenSL
boxing/src/main/java/com/bilibili/boxing/BoxingCrop.java