Question

I’m using the v4 compatibility library and switch to new fragments like this:

 FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
 transaction.setCustomAnimations(R.anim.fade_in, R.anim.fade_out);
 transaction.replace(R.id.contentFragmentContainer, event.getFragmentClass().newInstance(), FRAGMENT_CONTENT);
 transaction.addToBackStack(fragmentTransactionName);
 transaction.commit();

Now, when I want to return to a previous fragment programmatically without polluting the user’s back stack with new fragment transactions, I use popBackStackImmediate():

 if (fragmentManager.popBackStackImmediate(fragmentTransactionName, 0)) {
     return;
 }
 // apparently popping back to that fragment was not successful,
 // make a regular transaction now

This works all fine as is, despite that the animations that have been used to animate to one of the popped fragments are not reversed. I also tried to use transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE) beforehand, but this did not even show a transition when the regular transaction took place, neither does it show on reverse.

What am I doing wrong?

Answer 1

I’d say I have to Read The Fine Manual (TM) better:

public abstract FragmentTransaction setCustomAnimations
                (int enter, int exit, int popEnter, int popExit)

“Set specific animation resources to run for the fragments that are entering and exiting in this transaction. The popEnter and popExit animations will be played for enter/exit operations specifically when popping the back stack.”

(Source)