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Scott Junner9,010 Points
Why is ScrollView not root?
In AlbumDetailActivity.onTrackPanelClick() we initialise a Scene.
Why is the ScrollView of activity_album_detail.xml not the root ViewGroup?
Boban Talevski24,793 Points
My guess would be that we should restrict the scope of the layout to which we apply a transition since expanding the scope as much as we could would probably require more resources as Android creates animators and stuff behind the scenes for all affected views if I understood correctly.
So we don't have any reason to expand the scope of the transition to the root ScrollView of activity_album_detail.xml as we aren't adding anything that visually needs to be part of the transition with it. Anyway, I tested it with the scrollView as transition root and the transition looked the same (as far as I could tell) as with the detailContainer chosen as root, so it doesn't make a visual difference, but it probably adds more processing behind the scenes for no reason.
It would be nice if someone could confirm my theory though :).