Also the real problem with that is that it is doing the fade-out at all when you have selected the item, instead of just leaving it highlighted while doing the transition.
--
Dianne Hackborn
Android framework engineer
hackbod@android.com
Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them.
-- On Thu, Apr 19, 2012 at 11:25 PM, Jon Perlow <perlow@gmail.com> wrote:
I'm trying to improve the transition of an Activity containing a ListView that navigates to another Activity containing a ListView when the user selects an item.In ICS, the holo theme has a list selector that has a very nice fade-out transition. Maybe I am just doing something stupid, but AFAICT, the problem with this is that only a toy app could really make that transition work under Android's UI architecture. In order for the animation to be smooth, let's assume it needs a 25 fps draw rate. Drawing in android requires the UI thread. that means you can't block the UI thread for more than 40ms for that animation to render smoothly. In the scenario where clicking on a list item navigates to another activity, it requires that the other activity finish its onCreate, onStart, onResume, the measuring and layout of all its views in less than 40ms.Is this really possible for any real application? I noticed that most of the apps that come with Android are not using this transition. AFAICT, the Gmail app doesn't use it nor does the SMS app or the contacts app. There are a few apps that do use it like the preferences and the transitions are extremely choppy.-Jon--
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Dianne Hackborn
Android framework engineer
hackbod@android.com
Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them.
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