On Jan 21, 7:45 am, Mark Murphy mmur...@commonsware.com wrote:
Nmix wrote:
In a TabActivity I have a tab with a ListView. I manage the
visibility of a View for when the list is empty, done after filling
the list, whenever I know the backing data changes.
When the list is empty (empty View is visible) and the activity is
paused, and while paused the backing SQLlite table gets filled, when
my activity resumes the ListView gets filled with the new database
rows (managed cursor requery?) but I haven't had the chance to set the
visibility of the empty View, so it's still there.
I can figure out how to do this with some persistent data from pause
to resume, but I'm wondering if there's a 'cleaner' and automatic way
of achieving this in Android. Thanks.
If the trigger for making your View be visible is the existence of data,
perhaps notify-on-change support is what you want. I haven't played with
this much myself.
--
Mark Murphy (a Commons Guy)http://commonsware.com
Android Training in Sweden --http://www.sotrium.com/training.php
I kept it simple for now and refilled the ListView at onResume, so I
avoid having to expose the cursor or other data more globally than I
already do. It's somewhat redundant but it works since the visibility
logic is inside the method that does the filling.
An example that's very similar is Android's Call Log. If it's empty
and you make a call, then go back to the log and switch tabs from the
dialer to the log, it displays as expected (suppressing the 'empty'
View). Maybe they refill whenever the tab is selected. I avoid this
since it would be redundant if the data is the same. The difference
between my app and the Call Log is that no change of tab is involved.
Your suggestion may be better but in the interest of time I will move
on with what works.
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