Yesterday I tried to chain two animations !
Actually, what I wanted was, on my high-score list view : translate the listview out of the screen, change the listview content ( for a different type of game ), and retranslate the new listview in the screen.
But, reading the Android-dev mailing list, I realized that it could also interest people using an animationSet.
Apparently, a bug prevent them from handling the repeat flag correctly( see
here )
(Note that in my case, I couldn't use an animationSet, because I want to have an operation between the two animations ).
So I first use a AnimationListener to detect the end of the first animation, and launch there the second animation, and...
Kaboum... it ... failed !!
I had discovered a second bug related to animation ( or at least an undocumented constraint ) : you can't launch an animation in the OnAnimationEnd method of the AnimationListener.
I guess after the OnAnimationEnd, there is something like a ClearAnimation done on the view, that remove both the old and the new ones !
So the solution here is to post a message to launch the second animation on the next trame.
So here's my solution :
public class ScorePage extends ListActivity
{
class LocalAnimationListener implements AnimationListener
{
public void onAnimationEnd(Animation animation)
{
//LaunchInAnimation( ); // FAIL:the animation is not launched
//runOnUiThread( mLaunchSecondAnimation ); // FAIL : the runnable is launched immediatly, so like previous method !
//Handler curHandler = new Handler(); // OK, BUT :
//curHandler.post( mLaunchSecondAnimation); // create an unnecessary object !
getListView().post(mLaunchSecondAnimation); // OK : GOOD method !
}
public void onAnimationRepeat(Animation animation)
{
}
public void onAnimationStart(Animation animation)
{
}
};
private Runnable mLaunchSecondAnimation = new Runnable()
{
public void run()
{
LaunchInAnimation();
}
};
LocalAnimationListener MyAnimationListener = new LocalAnimationListener();
public void LaunchInAnimation()
{
// Change the listView Content :
mCurrentHiScore -=1;
if ( mCurrentHiScore < 0 )
mCurrentHiScore = 2;
ListAdapter curAdapter = mScore.GetScoreListAdapter(ScorePage.this, R.layout.score_entry, mCurrentHiScore);
if ( curAdapter != null )
setListAdapter( curAdapter );
// Launch the second animation :
Animation SlideAnim;
SlideAnim = AnimationUtils.loadAnimation(this, R.anim.slide_in_left);
ListView lv = getListView();
lv.startAnimation(SlideAnim);
}
public void LaunchOutAnimation()
{
Animation SlideAnim;
SlideAnim = AnimationUtils.loadAnimation(this, R.anim.slide_out_left);
SlideAnim.setAnimationListener( MyAnimationListener );
ListView lv = getListView();
lv.startAnimation(SlideAnim);
}
(... )
Now it's just fine !
