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Ian Lake

@ianlake.bsky.social

800 followers 140 following 250 posts

Android Toolkit Developer and Runner Also at: - https://androiddev.social/@ianlake - https://twitter.com/ianhlake

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Ian Lake @ianlake.bsky.social · May 20

Today, we've released a brand new Jetpack library - Navigation3! A pure Compose, state based navigation library: android-developers.googleblog.com/2025/05/anno...

Announcing Jetpack Navigation 3

Explore Jetpack Navigation 3, a new Compose-first navigation library with increased flexibility so Android developers to build robust experiences.

android-developers.googleblog.com

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Ian Lake @ianlake.bsky.social · 1d

There are no Hilt specific APIs on that page.

Ian Lake @ianlake.bsky.social · 1d

You'll have to be more specific on what your setup is. Navigation2? With Fragments? With Compose?

The ViewModel Scoping API does cover how to scope ViewModels to Nav2 entries: developer.android.com/topic/librar...

ViewModel Scoping APIs | App architecture | Android Developers

ViewModel lets you manage your UI's data in a lifecycle-aware fashion.

developer.android.com

Ian Lake @ianlake.bsky.social · 12d

Thanks, that's really helpful. We'll take a look!

Ian Lake @ianlake.bsky.social · 13d

Did you file an issue on the issue tracker with a sample project that reproduces your issue? I can make sure it gets sent to the right people if you reply with a link to it here.
issuetracker.google.com/issues/new?c...

issuetracker.google.com

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Ian Lake @ianlake.bsky.social · 13d

There's a lot of other releases this week including Metrics (JankState) reaching 1.0.0-rc01, WorkManager 2.11.0-beta01, plus a lot of Wear and XR releases.

Make sure to read through all of the release notes for the details!
developer.android.com/jetpack/andr...

Recent Release Notes | Android Developers

developer.android.com

Ian Lake @ianlake.bsky.social · 13d

Navigation3 1.0.0-alpha10 improves rememberNavBackStack's KMP support, breaks Scene APIs into its own package, & we've broken two layers out of NavDisplay in rememberDecoratedNavEntries (for multiple back stacks) and rememberSceneState (for owning system back).
developer.android.com/jetpack/andr...

navigation3 | Jetpack | Android Developers

developer.android.com

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Ian Lake @ianlake.bsky.social · 13d

NavigationEvent 1.0.0-alpha09 makes some pretty sweeping changes to the API surface.
- Dispatcher now focuses on global state with the new history and transitionState properties
- Handler has local state
- Compose users get a NavigationEventState for hoisting

developer.android.com/jetpack/andr...

navigationevent | Jetpack | Android Developers

developer.android.com

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Ian Lake @ianlake.bsky.social · 13d

Navigation 2.9.5 is out with an update to the Safe Args Gradle Plugin to ensure it works well with AGP 9.0's support for built-in Kotlin.
developer.android.com/jetpack/andr...

Navigation | Jetpack | Android Developers

developer.android.com

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Ian Lake @ianlake.bsky.social · 13d

Compose Material3 1.4.0 includes 11 months worth of new features and bug fixes. New carousel, SecureTextField, autoSize and TextFieldState support, TimePickerDialog, and more.

Note the removal of the material-icons-core dependency - add it manually now!
developer.android.com/jetpack/andr...

Compose Material 3 | Jetpack | Android Developers

developer.android.com

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Ian Lake @ianlake.bsky.social · 13d

This week's #JetpackReleaseNotes includes Window 1.5.0, Compose Material3 1.4.0 plus bug fixes in Compose 1.9.2, Navigation 2.9.5, Room 2.8.1, Sqlite 2.6.1, Wear Compose 1.5.2, and WorkManager 2.10.5.
developer.android.com/jetpack/andr...

Recent Release Notes | Android Developers

developer.android.com

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Ian Lake @ianlake.bsky.social · 18d

It is my daughter's birthday, so we celebrate it every year! Still a great song

Ian Lake @ianlake.bsky.social · 19d

tl/Dr: yes.

The state of each screen is completely separate from the actual objects in the back stack.

That's because all state is actually associated with a NavEntryDecorator. E.g., Compose State is saved by adding a SavedStateNavEntryDecorator.

Each decorator's state uses the entry's contentKey

Ian Lake @ianlake.bsky.social · 19d

Glad you're enjoying Nav3! Let us know if you're running into any issues or if there's specific APIs we should take a second look at.

(I'm actually pretty excited about this next week's release as we've been working through exposing some additional layers between the back stack and NavDisplay)

Ian Lake @ianlake.bsky.social · 19d

Happy to chat about Nav3 anytime if you'd like to learn more or chat about which layer any sort of integration would make sense.

Ian Lake @ianlake.bsky.social · 19d

Also, you most certainly don't want to be passing a backstack of just indices to NavDisplay, since those keys that make up the back stack are what Nav3 maps each screen's saved state. Replacing screen #3 with a totally different screen #3 shouldn't reuse the state from the initial instance.

Ian Lake @ianlake.bsky.social · 19d

I'm not sure where you got the idea that Nav3 pushes navigation logic into the Compose UI layer?

As seen in your example, hoisting the back stack out of the UI is supported and recommended. We do it ourselves in our modular sample: github.com/android/nav3...