core/src/in/srain/cube/image/ImageLoader.java
public void preLoadImages(String[] urls) {
        int len = urls.length;
        for (int i = 0; i < len; i++) {
            ImageLoadRequest request = new ImageLoadRequest(urls[i]);
            final ImageTask imageTask = createImageTask(request);
            imageTask.setIsPreLoad();
            addImageTask(imageTask, null);
        }
    }
public void preLoadImages(String[] urls) {
        int len = urls.length;
        for (int i = 0; i < len; i++) {
            ImageLoadRequest request = new ImageLoadRequest(urls[i]);
            final ImageTask imageTask = createImageTask(request);
            imageTask.setIsPreLoad();
            addImageTask(imageTask, null);
        }
    }
Load the image in advance.