private void preloadAdapterPosition(List<T> items, int position, boolean isIncreasing) {
        final int numItems = items.size();
        if (isIncreasing) {
            for (int i = 0; i < numItems; ++i) {
                preloadItem(items.get(i), position, i);
            }
        } else {
            for (int i = numItems - 1; i >= 0; --i) {
                preloadItem(items.get(i), position, i);
            }
        }
    }
Returns a non null {@link GenericRequestBuilder} for a given item. Must exactly match the
request used to load the resource in the list.

<p>
The target and context will be provided by the preloader.
</p>

@deprecated Use {@link PreloadModelProvider} instead. This method will be
removed in Glide 4.0.
@param item The model to load.
core/src/main/java/com/bumptech/glide/ListPreloader.java