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When the display state is DOZE or DOZE_SUSPEND, assume this means that the AP may go to sleep at any time so hold a wake lock for a little while starting when traversals are scheduled to ensure that the AP remains awake long enough to draw and post the frame to the display hardware. This patch is somewhat approximate but should be good enough for most devices today. Note that the implementation uses the window manager to ensure that the window which wants to draw is actually visible before acquiring the wake lock. There is a cost to this test (a round-trip) which should not be significant today since we do not expect apps to draw more than one frame or two while dozing. However, if we wanted to support animations in general, we might want to optimize it or eliminate the check altogether (since we can already account for the app's use of the wake lock). Another way to implement this functionality might be for the view hierarchy to listen for the power manager to report that it has entered a non-interactive power state before deciding to poke draw locks. This would be somewhat more accurate than watching the display state. Also, the draw lock timeout logic could be implemented more directly instead of using an ordinary timed wake lock. Bug: 18284212 Change-Id: I84b341c678303e8b7481bd1620e634fe82cc4350
Layoutlib is a custom version of the android View framework designed to run inside Eclipse. The goal of the library is to provide layout rendering in Eclipse that are very very close to their rendering on devices. None of the com.android.* or android.* classes in layoutlib run on devices.