How does an external client connect to a MediaLibraryService?

[aljohnston112]

How does an external client connect to a MediaLibraryService?

[aljohnston112]

I seem to have verified via debugging that the Activity, despite making another session token, does indeed connect to the MediaLibraryService that has been started by the application.

There is one weird thing that may be a bug and, if so, I can add an issue for it. When a controller calls setMediaItem, the session's onAddMediaItems is called. setMediaItems says that it clears the playlist, so how is onAddMediaItems supposed to know if the call was from setMediaItems or one of the addMediaItem(s) methods in which the playlist should not be cleared?

[marcbaechinger]

Android makes sure there is only a single instance of a given service running at the same time.

How is an external client supposed to know the ComponentName so they can connect to it? Are they able to find it via an Intent that matches the given actions declared in the intent-filter for the service?

Yes. An app can query the PackageManager for services that other apps have in their manifest when exported=true.

so how is onAddMediaItems supposed to know if the call was from setMediaItems or one of the addMediaItem(s) methods in which the playlist should not be cleared?

I think the library handles this for the user. There is Callback.onSetMediaItems() that by default delegates to onAddMediaItems and the calls player.setMediaItems(items, windowIndex, startPositionMs).