Preloading images

To preload remote images and ensure that the image is only downloaded once:

Glide.with(context)
    .load(yourUrl)
    .diskCacheStrategy(DiskCacheStrategy.SOURCE)
    .preload();

Then:

Glide.with(context)
    .load(yourUrl)
    .diskCacheStrategy(DiskCacheStrategy.SOURCE) // ALL works here too
    .into(imageView);

To preload local images and make sure a transformed copy is in the disk cache (and maybe the memory cache):

Glide.with(context)
    .load(yourFilePathOrUri)
    .fitCenter() // Or whatever transformation you want
    .preload(200, 200); // Or whatever width and height you want

Then:

Glide.with(context)
    .load(yourFilePathOrUri)
    .fitCenter() // You must use the same transformation as above
    .override(200, 200) // You must use the same width and height as above
    .into(imageView);

Found a mistake? Have a question or improvement idea? Let me know.

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