olly ce01c79e01 Add a javadoc explanation for ProgressiveDownloader that explains that it tries to skip downloading already cached bytes.
download calls through to CacheUtil#cache, which handles skipping already downloaded bytes.

It is useful for callers to know that ProgressiveDownloader has this behavior - otherwise, they might reimplement the logic themselves.

I hope this behavior is something that can be part of the public API :)

PiperOrigin-RevId: 274202995
2019-10-13 12:41:55 +01:00
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ExoPlayer library

The ExoPlayer library is split into multiple modules. See ExoPlayer's top level README for more information about the available library modules and how to use them.