Android :: Live Folders Register For Change In Content

If I create a content provider to service a live folder, and if this content provider is just a wrapper aggregating other content providers, how does the live folder know if the real content has changed somewhere down the line.

For example, I have a live folder that has items pointing to video, audio, and notes. Each item in the cursor (such as an aggregated matrix cursor) may be pointing to a different underlying content provider. But each item will have its own uri.

Does the live folder view register for content changes for each uri? Or is it the responsibility of the wrapper content provider to register for content changes and then notify its client the live folder?