private void cancelAll() {
        for (int i = 0; i < maxPreload; i++) {
            Glide.clear(preloadTargetQueue.next(0, 0));
        }
    }
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