Glide: How to use RecyclerViewPreloader with Glide 3.7.0 ?

[hishambakr]

Dears,
I use Glide 3.7.0 . I want to preload images in recycler view . I don't find recycler view support in Glide 3.7.0

I tried to extract RecyclerViewPreloader from master branch but it gives me compilation error plus there is no example to use it with Glide v3.7.0

Please help

[TWiStErRob]

The API changed between 4.0 and 3.x, but it seems I did backport this earlier for some reason:
https://github.com/TWiStErRob/glide-support/tree/master/src/glide3/thirdparty/com/bumptech/glide/integration/recyclerview
Though there's no actual usage of this, it should be the same/very close to the usages on master. Please tell me how these classes perform with 3.7 :)

[hishambakr]

Thanks for reply but this didnt help me. it is the same like on master.

what i want is an example. I searched all internet and can't find example

I have a recycler view. how to prefetch images. I saw the link but don't know how to use it.

Appreciate your support. you will save me a lot of time. I was trying to build master branch inside my app but faced many dependancies

tried to use listView example with the class you mentioned. seems there is something missing

for example:

public RecyclerViewPreloader(RequestManager requestManager,
            PreloadModelProvider<T> preloadModelProvider,
            PreloadSizeProvider<T> preloadDimensionProvider, int maxPreload) {

        ListPreloader<T> listPreloader = new ListPreloader<>(preloadModelProvider,
                preloadDimensionProvider, maxPreload);
        recyclerScrollListener = new RecyclerToListViewScrollListener(listPreloader);
    }

why it takes request manager and doesn't use it ?

also where is the PreloadModelProvider ?

please give me full example to help me

[TWiStErRob]

Good points :) I think I wanted to use it for something, copied it, made it compile, and added that unused suppress to early so I didn't notice RM not being used.

Added a full example for you (see commit above), here's an excerpt:

PreloadingAdapter adapter = new PreloadingAdapter(Glide.with(this), ...);
list.addOnScrollListener(new RecyclerViewPreloader<>(adapter, adapter, 5));

private static class PreloadingAdapter extends RecyclerView.Adapter<SimpleViewHolder>
        implements PreloadModelProvider<String>, PreloadSizeProvider<String> {
    private final GenericRequestBuilder<String, ?, ?, ?> glide;
    private int[] stolenSize;

    public PreloadingAdapter(RequestManager glide, List<String> urls) {
        this.urls = urls;
        this.glide = glide.fromString();
    }

    @Override public void onBindViewHolder(SimpleViewHolder holder, int position) {
        Target<?> target = glide.load(url).into(holder.imageView);
        if (stolenSize == null) {
            // assuming uniform sizing among items (fixed size or match works, wrap doesn't)
            target.getSize(new SizeReadyCallback() {
                @Override public void onSizeReady(int width, int height) {
                    if (0 < width && 0 < height) {
                        stolenSize = new int[] {width, height};
                    }
                }
            });
        }
    }
    @Override public List<String> getPreloadItems(int position) {
        return Collections.singletonList(getItem(position));
    }
    @Override public GenericRequestBuilder getPreloadRequestBuilder(String item) {
        return glide.load(item);
    }
    @Override public int[] getPreloadSize(String item, int adapterPosition, int perItemPosition) {
        return stolenSize;
    }
}

[rule-po]

Hi Rob.
Can you show me how to add this RecyclerViewPreloader to use with 3.7.0. ?
I tried to copy code and add it to my project but I'm getting
Error:(85, 42) error: cannot infer type arguments for ListPreloader<>

Thanks in advance.

[TWiStErRob]

@rule-po Are you using the ones mentioned here https://github.com/bumptech/glide/issues/1189#issuecomment-218017999?

[rule-po]

@TWiStErRob Yes, I have used those and it that is error I got.
Any suggestion how to add it to code would be appreciated.

[TWiStErRob]

There's an actual usage example in that repo as well:
https://github.com/TWiStErRob/glide-support/commit/92b40e9ef64c964eb43b329aaae56d8f0a19706e
(ignore the gradle 4.0.0 update, that's unrelated)

[rule-po]

@TWiStErRob I tried that too, but it doesn't work.
Error:Failed to resolve: com.github.bumptech.glide:recyclerview-integration:2.0.0-SNAPSHOT

[TWiStErRob]

@rule-po https://github.com/bumptech/glide/wiki/Snapshots, but you probably don't need that, because it's for 4.0 and you're using 3.7. Look at my build.gradle, it should be clear which deps are for v3 and v4.