Fresco - Cancel Prefetch Requests

Question

In my app I was prefetching images so they load faster when user scrolls using prefetchToBitmapCache. Now when user applies a filter, these prefetches remain in pipeline and slow down the loading of new images.

How I am prefetching: When use scrolls down through images, I prefetch X number of images after LinearLayoutManager.findLastVisibleItemPosition()'s value. I need a way to cancel all these prefetches when user applies a filter. Is there a way to do this or a better way of prefetching?

Answer 1

I am part of the Fresco team and may be able to help. Both imagePipeline.prefetchToDiskCache and imagePipeline.prefetchToBitmapCache return DataSource<Void> object. If you store the returned instance somewhere, you can just close it and that should cancel the prefetch.

// initiate prefetch
prefetchDataSource = imagePipeline.prefetchToBitmapCache(imageRequest, callerContext);

// cancel prefetch
prefetchDataSource.close();