What's new in Flutter 3.38

CupertinoDynamicColor wide gamut support

Certain properties and methods in `CupertinoDynamicColor` were deprecated to align with the `Color` class due to wide gamut color spaces support added in Flutter 3.27.

SnackBar with action no longer auto-dismisses

The default behavior of a `SnackBar` with an action has changed. Previously, a `SnackBar` with an action wouldn't auto-dismiss if talkback was enabled. Now, all `SnackBar` widgets with an action default to a non-dismissible state until the user interacts with the action button.

The default page transition on Android is now PredictiveBackPageTransitionBuilder

The default page transition on Android has been updated from `ZoomPageTransitionsBuilder` to `PredictiveBackPageTransitionsBuilder`. When not using predictive back, this falls back to `FadeForwardsPageTransitionsBuilder`.

UISceneDelegate adoption

Learn how to migrate your Flutter iOS app, add-to-app integration, or plugin to Apple's required UIScene lifecycle.

Remove deprecated `AssetManifest.json` file

Remove deprecated `AssetManifest.json` file (Framework, by @matanlurey).

Remove 2023 deprecated `'platforms'` key from daemon output

Remove 2023 deprecated `'platforms'` key from daemon output (Tooling, by @matanlurey).

Remove deprecated `--[no-]-disable-dds`

Remove deprecated `--[no-]-disable-dds` (Tooling, by @matanlurey).

Deprecate OverlayPortal.targetsRootOverlay

Deprecate SemanticsProperties.focusable and SemanticsConfiguration.isFocusable

Suppress deprecated iOS windows API in integration_test

NavigatorPopScope examples no longer use deprecated onPop.

Fix docs referencing deprecated radio properties

Adds deprecation for impeller opt out on android

Update `build.gradle` to remove deprecation warning in `flutter\engine\src\flutter\shell\platform\android`

Fix deprecated configureStatusBarForFullscreenFlutterExperience for Android 15+

[web] Cleanup usages of deprecated `routeUpdated` message

Add `--dart-define`, `-D` to `assemble`, deprecate `--define`, `-d`.

[ Tool ] Remove leftover Android x86 deprecation warning constant

Deprecate Objective-C plugin template

Stop using deprecated analyzer 7.x.y APIs.

Add dartpad example to `RoundedSuperellipseBorder`

Add a getter to get the recorder used by painting context

add `debugPaintTextLayoutBoxes` for debugging text layout

Add CLA note to tree hygiene

Feat: Add momentary varient of CupertinoSlidingSegmentedControl

Add hitTestChildren to baseline-aligned stack

Add missing deprecations to CupertinoDynamicColor.

Add a SliverList code sample

Add the 'windowing' feature flag and use to wrap an implementation for regular windows that always throws

Add radius clamping to web `RSuperellipse`

feat: Cupertino sheet implement upward stretch on full sheet

Implements the Android native stretch effect as a fragment shader (Impeller-only).

Reapply "Add set semantics enabled API and wire iOS a11y bridge (#161…

Retry "Implements the Android native stretch effect as a fragment shader (Impeller-only)."

Implement Overlay.of with inherited widget

Reapply "Add set semantics enabled API and wire iOS a11y bridge"

Add SliverGrid.list convenience constructor

Allow OverlayPortal.overlayChildLayoutBuilder to choose root Overlay

Add semanticIndexOffset argument to SliverList.builder, SliverGrid.builder, and SliverFixedExtentList.builder

Engine Support for Dynamic View Resizing

Add `CupertinoLinearActivityIndicator`

Add non uniform TableBorder

Add an assertion for the relationship between `Visibility.maintainState` and `Visibility.maintainFocusability`

Implement Regular Windows for the win32 framework + add an example application for regular windows

[web] Remove all usages of js_util.

Platform views shouldn't receive pointer events when not laid out

Recommend using Flutter feature flags over platform-specific configs

Migrate to null aware elements - Part 1

Improve assertion message in `_MixedBorderRadius.resolve()`

Reland - Manual roll of Dart from 5ede85aff798 to 14ea8d342149

Migrate to null aware elements - Part 2

Migrate to null aware elements - Part 4

[web] Text editing test accepts both behaviors in Firefox

[engine] Null aware elements clean-ups

Reformat text.dart's code snippets

Remove jetifier usages from framework and engine

Null aware elements clean-ups

[VPAT][A11y] Announce Autocomplete search results status

[a11y] : set isFocused will update isFocusable to true

Improve Stack widget error message for bounded constraints

Refactor text and runtime effect to separate skia and impeller implementations.

[iOS][Secure Paste] Custom edit menu actions

Flutter driver deserialization

[impeller] Support partitioned host buffer

Ensures initial semantics state is sent to engine

Depend on operator overload synthesis for three-way and equality comparisons.

Update transformHitTests documentation for clarity

chore: move engine docs out of engine/ and into docs/

[CP-beta]Add guided error for precompiled cache error

Perform OpenGL compositing in the Flutter thread and write to a framebuffer.

Use a fake representation of `cache/artifacts/gradle_wrapper`

[Impeller] Improvements to the Vulkan pipeline cache data writer

Read `bin/cache/flutter.version.json` instead of `version` for `flutter_gallery`

[Impeller] Disable the render target cache when creating a snapshot in DlImageImpeller::MakeFromYUVTextures

[Impeller] Optimize scale translate rectangle transforms

[Impeller] Optimize scale translate rectangle transforms

Delete Skia-specific performance overlay implementation

Adapt xcresult parser for Xcode 16 changes

Migrate Embedder code to impeller/DL geometry classes

Made the view controller weak for the accessibility bridge.

Migrate surface frame shell code to DisplayList/Impeller geometry classes

Prepare for iOS debugging with lldb and devicectl

Use LLDB as the default debugging method for iOS 17+ and Xcode 26+

Directly generate a Mach-O dynamic library using gen_snapshot.

Stream logs from `devicectl` and `lldb`

[Android] Restrict AOT shared library engine flag to trusted paths

Remove the option to disable the merged platform/UI thread on Android and iOS

Remove build configuration mismatch warning

Build engine TUs with C++20.

Filter out unexpected process logs on iOS with better regex matching.

Connect the FlutterEngine to the FlutterSceneDelegate

Ignore upcoming `experimental_member_use` warnings.

Handle FlutterEngine registration when embedded in Multi-Scene apps

Update warnGradleVersion to `8.7.0`

[FGP] Small restructuring of Android Studio native flutter dependency support

Refactor Android platform view code in advance of enabling HCPP on existing PV widgets (behind a flag)

Blocks exynos9820 chip from vulkan

Migrate deeplink json creation to public AGP api

Engine build setup for Android RISCV64.

[HCPP] Clean up overlay layer when last frame had overlay content and current doesn't

Increase testing coverage and maintainability of android manifest parsing logic

[ Widget Previews ] Add support for `MultiPreview`s

[ Widget Preview ] Cleanup for experimental release

[ Widget Preview] Add `group` property to `Preview`

[ Widget Preview ] Allow for custom `Preview` annotations, add support for runtime transformations

Remove 'v' Open DevTools from help on web in profile/release mode

Refactor and forbid `base/exit.dart` outside of `lib/runner.dart`

Remove IDE validation from `flutter doctor`

Add a warning on usage of `dartPluginClass: 'none'`.

Adds `(defaults to ___)` when using `flutter config --help`

Upgrade flutter_lints in project template pubspec.yaml files

Add support for `/?` to alias to `--help`

feat: start using the content aware hash for downloading artifacts

Use baseUri always when doing a hot reload or hot restart

Wrap `ShutdownHook` calls to avoid crashing the tool

Refactor checks for `--machine`

Omit `w` (widget tree), `t` (render tree) from `flutter run --profile` `h`

Hide `flutter assemble` unless `--verbose`

feat: start using the content aware hash for downloading artifacts

Omit instruction to `cd .` after `flutter create`

Wraps all `git` executions in a `Git(...).*`, use `*=noglob` on Windows

Remove stale references to `.packages` in tool tests

Prefix generated Dart plugin imports for `registerWith`

Emit a warning on `--[no-]disable-dds`, preferring `--no-dds`

Remove support for `pluginClass: none` (on `master`; `> 3.35.0`)

- `flutter run -d chrome` may crash with a `DartDevelopmentServiceException` when the application shuts down during the startup sequence.

- `flutter run -d all` crashes if multiple devices are available.

- Apps crash during launch on Windows when run from paths containing non-ASCII characters.

- Configuration changes to run tests on macOS 15 or 15.7.2 for Flutter's CI.

- Apps crash on Android when enabling accessibility, hiding a platform view, and pulling out the top curtain.

`flutter widget-preview start` can crash if `.dart_tool/widget_preview_scaffold/.dart_tool` doesn't exist on subsequent runs.

`flutter widget-preview start` crashes if a file named `pubspec.yaml` is modified outside the root of the previewed project.

`flutter attach` can crash if the target application disconnects unexpectedly.

Bump Dart version to [3.10.1](https://github.com/dart-lang/sdk/blob/3.10.1/CHANGELOG.md#3101).

Widget preview command can crash on exit if in the middle of analyzing changes to a Dart file.

Flutter fails to build on iOS with error message: "Improperly formatted define flag" in add-to-app scenarios.

Running flutter pub get can crash the widget previewer when plugin dependencies are added or updated.

Certain flutter crash scenarios can result in multiple crash reports being submitted for a single process crash.

When debugging from an IDE with a physical iOS 26 device, IDE installs an app but hangs on a white screen during launching.

When using an ffi plugin on macOS, generated frameworks have the wrong structure.

Update Dart to 3.10.8.

- `flutter widget-preview start` creates new cached build artifacts on each run, resulting in increasing disk usage after each run.

- Flutter Android apps that upgrade to AGP 9.0.0 require migration steps.

- When WebViews are scrolled on iOS 26, they become unclickable.

- When the virtual keyboard is closed on Android web, the area behind it remains blank and the app only draws in the area that used to...

Update dart to 3.10.4.

Rendering issues in the Linux desktop embedder when using Skia.

AppLocalizations getting deleted when running debug web

Flutter Web applications launched in Chrome show a warning related to --no-sandbox.

docs: Clarify Transform.rotate origin interaction with alignment

fix typo in test_profile/README.md

Fix typo in widget_inspector.dart

Fix typo in pages.dart

Improve xcresult comment and naming

fix typo in test documentation function name

Fix GitHub labeler platform-android typo

fix typo in test documentation #2

fix typo in test documentation

fix small typo in test docs

Clean up typos in `PlatformViewsControllerTest.java`

[web] Remove outdated comment about HTML renderer

Improve robustness of comment detection when using flutter analyze --suggestions

fix typo in comments to mention `settings.gradle/.kts` instead of `build.gradle/.kts`

Fix typo in tests `README`

Remove comment about trailing commas from templates

Remove jetifier usages

fix: correct typo in analysis_options.yaml comment (disabeling -> disabling)

fix typo in `Crashes.md`

Windowing integration tests now await change futures if a changes is expected + commenting our erroneous icon in Runner.rc for win32