Listview and animation

I'm using listview animation from API DEMOS, example 2. here's the snippet from OnCreate method:

ListView listview = (ListView) findViewById(android.R.id.list);

AnimationSet set = new AnimationSet(true);
Animation animation = new AlphaAnimation(0.0f, 1.0f);
animation.setDuration(50);
set.addAnimation(animation);

animation = new TranslateAnimation(
    Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0开发者_运维问答f,
    Animation.RELATIVE_TO_SELF, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f);

animation.setDuration(200);
set.addAnimation(animation);

LayoutAnimationController controller = new LayoutAnimationController(set, 0.5f);
listview.setLayoutAnimation(controller);

At some point in the future, notifyDataSetInvalidated() is called upon list's adapter, and my list is refreshed. but the items are not shown in animation any more.

Please help.

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If you want to reanimate your LayoutController after your data set changes, call the method startLayoutAnimation() of the view.

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You should check out this thread about difference between notifyDataSetChanged() and notifyDataSetInvalidated() (Link updated to point to Romain Guy's answer!)

In short the difference is:

• notifyDataSetChanged: The items in the data set are changed (added / removed / updated / reordered, whatever).
• notifyDataSetInvalidated: The data source of the adapter is no longer available.

Here you can find a working sample with notifyDataSetInvalidated function in use. Probably it will do the trick with your animation problem as well.