How can I make an Android Gallery redraw when a View changes?

Question

I am modifying an Activity to implement onConfigurationChanged(...) and it contains a extended Gallery whose members are sized manually using their LayoutParams from the Gallery's adapter.

Unfortunately the Gallery initially displays wrong: the extended View fills the whole screen. As soon as another item is selected, though, the View displays with the correct size.

As an experiment, I tried freezing the dimensions of the selected View from the Gallery#onConfigurationChanged(...) method and the same behaviour occurred, suggesting the View has been updated, but the Gallery isn't showing the change.

I also tried calling both invalidate() and postInvalidate() on the Gallery from Activity#onConfigurationChanged(...). Nothing.

How can I force the Gallery to redraw with the correct dimensions for the View?

I am not sure how you are adding your views onto your gallery, however, try calling invalidate() on the views inside the adapter rather than just on the gallery itself. — SnowyTracks, Oct 21 '11 at 11:10
Already tried that (from inside the View method that resets everything); still no joy. `postInvalidate()` didn't do anything either. — Andrew Wyld, Oct 21 '11 at 11:31
Actually `notifyDataSetChanged()` does work IF I do it from a delayed Runnable. So clearly the problem is that the `LayoutParams` are not being updated soon enough. — Andrew Wyld, Oct 21 '11 at 11:41
I called it conditionally (first time after configuration change only) from `Gallery#onDraw()`. Worked fine :) — Andrew Wyld, Oct 21 '11 at 12:36

score 0 · Answer 1 · edited Sep 28 '12 at 10:49

0

Calling notifyDataSetChanged() on your gallery adapter should do the job.

If it does not, it may be something wrong with your codes somewhere.

edited Sep 28 '12 at 10:49

Mihai Iorga

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answered Aug 02 '12 at 09:05

nellute

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How can I make an Android Gallery redraw when a View changes?

1 Answers1