I'm not a GUI guru, but I'll try to answer :)
Dialogs are managed by Activity class inside the Android framework.
If a dialog is shown with showDialog(id, [bundle]), it's remembered by
Activity as being visble, and will be saved by Activity at the same time
as your onSaveInstanceState / onRestoreInstanceState are called (if you
have those overrides).
This means that managed dialogs survive orientation changes, as well as
the activity being destroyed and re-created when the user comes back to
it (such as with the list of recent applications, called up by [Home]
long press).
http://developer.android.com/guide/topics/ui/dialogs.html
AFAIK, there is no way to check whether a a given dialog is on the
screen, although the framework certainly knows this.
-- Kostya
01.02.2011 16:31, Jian Chen пишет:
A problem confused me for a little while， which is about dialog
window and activity。
In a normal activity，an alert dialog is called to be shown on top of
this activity，and HOME key is pressed to go to HOME screen。
Then HOME key is long pressed to go back to this activity。
Surprisingly, the alert dialog is restored.
Is this job done by activity manager?
A second question is, in some scenarios the activity does not hold the
reference, is there a way to index its top window(for example, dialog
window) from this activity's API?
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Kostya Vasilyev -- WiFi Manager + pretty widget -- http://kmansoft.wordpress.com
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