Related bug report here:
http://code.google.com/p/android/issues/detail?id=15623&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
On Mar 16, 9:54 am, Kelly Merrell <kmerr...@mercuryintermedia.com>
wrote:
> Hi All,
> I am having trouble using or understanding how popping
> FragmentTransactions off of the back stack handles the custom
> animations. Specifically, I expect it to call the "out" animation, but
> it doesn't seem to.
>
> I have a simple method to handle a fragment transaction
> (FragmentTransaction) where I add a fragment and apply a custom
> transition so that it will fade-in/fade-out. I am also adding this to
> the back stack so that the user can undo that transaction with the
> back button, essentially navigating to the state before the fragment
> was added.
>
> Everything works great moving forward, but when the user clicks the
> back button, the transition animations do not reverse. What I expected
> was that when the fragment got removed, it would use the fade out
> animation. Instead it seems to pop out (without animation) and then
> the container seems to fade in. I'm not sure that this is exactly what
> is happening, but the fragment is definitely not fading out.
>
> Here is the method that handles the transaction:
>
> protected void changeFragment() {
> FragmentTransaction ft = fm.beginTransaction();
> ft.setCustomAnimations(android.R.anim.fade_in,
> android.R.anim.fade_out);
> ft.add(R.id.fragment_container, new TestFragment());
> ft.addToBackStack(null);
> ft.commit();
>
> }
>
> My application uses the compatibility library to add fragment support,
> but I assume this to be applicable to Honeycomb (android-11) as well.
>
> Does anyone know if I am just doing something wrong here or if I am
> just expecting too much? Ideally, I would like to animate the
> fragments similarly to how Gmail (on the Xoom) does in regards to
> moving forward by clicking a message and then back by using the back
> button. Preferably not having to override the back button
> functionality and keep up with my own fragment state since I could
> have several "transactions" that I would want to back out of and I am
> not a fan of re-inventing wheels.
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