[android-developers] Hidden fragments (and animations) after a rotation

Hi!

I have an activity with a fragment that I hide in a transaction with a
custom animation.
This transaction is added to the back stack.
If I don't rotate the screen this is working as expected (pressing
'back' un-hides the fragment with the animation)

1/ If I rotate the screen, the fragment is no longer hidden. I
discovered that if I call setRetainInstance(true) on the fragment
however, this problem disappears. But is this expected and/or
documented somewhere?

2/ But even if I do that, pressing 'back' shout un-hide the fragment,
with the custom animation. However:
- Not using the support package, on a 3.2 Xoom, the fragment stays hidden.
- Using the support package, the fragment does become visible again,
but with no animation.
Is this a (known) bug or did I miss something?

Thanks a lot for your help!

Here is the simple example demonstrating this (replace FragmentActivity
by Activity and comment/uncomment to switch from using the support
package or not):

public class MainActivity extends FragmentActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (savedInstanceState == null) {
final TestFragment testFragment = new TestFragment();
testFragment.setRetainInstance(true);

final FragmentTransaction ftAdd =
getSupportFragmentManager().beginTransaction();
// final FragmentTransaction ftAdd =
getFragmentManager().beginTransaction();
ftAdd.add(R.id.container, testFragment);
ftAdd.addToBackStack(null);
ftAdd.commit();

final FragmentTransaction ftHide =
getSupportFragmentManager().beginTransaction();
// final FragmentTransaction ftHide =
getFragmentManager().beginTransaction();
// ftHide.setCustomAnimations(android.R.animator.fade_in,
android.R.animator.fade_out, android.R.animator.fade_in,
android.R.animator.fade_out);
ftHide.setCustomAnimations(android.R.anim.fade_in,
android.R.anim.fade_out, android.R.anim.fade_in, android.R.anim.fade_out);
ftHide.hide(testFragment);
ftHide.addToBackStack(null);
ftHide.commit();
}
}

public static class TestFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container, Bundle savedInstanceState) {
final TextView res = new TextView(getActivity());
res.setText("Fragment");
return res;
}
}
}

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BoD

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