`BasePreloadManager` coordinates the preloading for multiple sources based on the priorities defined by their `rankingData`. Customization is possible by extending this class. Apps will implement `TargetPreloadStatusControl` to return preload manager the target preload status for a given `rankingData` of the source.
`DefaultPreloadManager` extends from the above base class and uses `PreloadMediaSource` to preload media samples of the sources into memory. It also uses an integer `rankingData` that indicates the index of an item on the UI, and the priority of the items is determined by their adjacency to the current playing item. Apps can set the index of current playing item via `DefaultPreloadManager.setCurrentPlayingIndex` when the user swiping is detected.
PiperOrigin-RevId: 612829642
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