commit | 5104c7c386ea69551616e8723cb87e5dbd27f6ad | [log] [tgz] |
---|---|---|
author | Ian Lake <ilake@google.com> | Mon Mar 29 13:43:30 2021 -0700 |
committer | Ian Lake <ilake@google.com> | Mon Mar 29 14:44:48 2021 -0700 |
tree | 1a022061192c4c0be1c5c900c6900bb336c5ba4c | |
parent | ba855ba505d9cff27d0a404c763f5c797970e444 [diff] |
Add the API to restore a saved back stack Saving the back stack is only half of the API; the other half is the ability to later restore that back stack onto the FragmentManager. This is the role of the restoreBackStack() API. It takes a name (the same name passed to addToBackStack() and then later passed to saveBackStack()) and re-instantiates all of the FragmentTransaction and Fragment instances and re-applies them to the FragmentManager. Particularly, this builds on the state saving done by saveBackStack() to ensure that every fragment that was saved has its saved state restored when you call restoreBackStack(). The addition of this API did expose some issues in the previously added code, namely: - saveBackStack() needs a callback immediately after the FragmentTransaction pop is executed and *before* the Fragments are destroyed. This ensures that the right internal IDs of Fragments are saved in the BackStackRecordState and means we can't use the on commit runnables list and need to maintain our own list. - As the population of the BackStackRecordState is asynchronous, BackStackState needs to keep a reference to the original list created by saveBackStack() rather than copying the entries into its own ArrayList. Relnote: N/A Test: new tests pass BUG: 80029773 Change-Id: Ib8c35cea758379374cde7c1253922e345544b3c5
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