Is it possible to somehow set the users home-screen wallpaper as the background of an Android app? I think it could be a very interesting way of making your app seem to be more of a part of the phone.
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I can't test this, but you may be able to use a WindowManager, and then use public static final int FLAG_SHOW_WALLPAPER
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From WindowManager docs Window flag: ask that the system wallpaper be shown behind your window. The window surface must be translucent to be able to actually see the wallpaper behind it; this flag just ensures that the wallpaper surface will be there if this window actually has translucent regions.
You can set your window area to transparent above this and that may solve your issue. It's a clever idea, and I'd love to see how it turns out.

RossC
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Did you have any luck with this? Or did you just abandon it? – RossC Nov 15 '13 at 15:00