commit | 9fc6ccd6e1759d75a8b72f49cedd359e87ba2f99 | [log] [tgz] |
---|---|---|
author | Ian Lake <ilake@google.com> | Tue Oct 26 16:16:02 2021 -0700 |
committer | Ian Lake <ilake@google.com> | Tue Oct 26 16:16:02 2021 -0700 |
tree | de3b8bbd295341867b985d393051fd896c68e065 | |
parent | 5ec8a10af160f028bef89479cd51e263f24c1748 [diff] |
Fix handling deep links with multiple back stacks Navigation's support for multiple back stacks (via saveState and restoreState) require that those flags be passed to the calls to navigate(). Otherwise, you are building a single back stack. However, in the case of deep links, it is NavController that is calling navigate() on your behalf, building up the correct back stack, making it impossible to call saveState and actually build up multiple back stacks. This is most apparent when using NavigationUI and deep linking into another graph (e.g., a different graph than your start destination). With this change, handleDeepLink() will automatically call saveState when your deep link links to another graph, ensuring that your multiple back stacks are built correctly. For example, if you had three graphs: A (your starting graph), B, and C and you deep link to B1, your final back stack would be A1 -> B1 (as the start destination of your graph is automatically added to any deep link) and tapping on tab A would correctly return you to A1 since we've now call saveState when navigating to B1. This support extends to explicit deep links as well with the same heuristic of navigating to another graph in place. While this logic appears to always be the right thing to do, an experimental API of NavController.enableDeepLinkSaveState(saveState: Boolean) has been added to disable this behavior if your fragments are not ready to support saveState (e.g., you are using retained fragments still - please stop). Relnote: "The handling of both explicit and implicit deep links now automatically add the `saveState` flag when navigating to another graph, ensuring that code such as `NavigationUI.setupWithNavController` and multiple back stack using code works as expected." BUG: 194301895 Test: tested in integration-tests app with multiple back stacks Test: verified no regressions for other handleDeepLink cases Change-Id: Ic8807b65fbcaf8d859f2ac35a45d508d2714231e
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