Ah, that makes sense.  Thank you.

On Apr 8, 4:45 pm, Dianne Hackborn <hack...@android.com> wrote:
> It will only modify the screen while that window/activity is being shown to
> the user.  This allows it to be done in a safe way (no permission required)
> which the system can recover from if there is a bug in the application (or
> if the application gets killed for some reason, as we tend to do).
>
>
> --
> Dianne Hackborn
> Android framework engineer
> hack...@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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