I'm designing a custom Android 4.0 (ICS) device for special purpose.
One of the things I'm looking for is a way to make the Android Launcher, when other activities were previously running, show the last running activity as a transparent, dimmed background, with the launcher icons and widgets on top.
What I'm looking for, is something like this: How do I create a transparent Activity on Android?, except as a modification to Launcher2. I guess I can apply a similar style to the launcher as proposed in that SO, but what about the wallpaper?
AFAIU, the wallpaper is rendered by a separate service, and I still want it rendered if there are no other activities behind the launcher.
Any tips?