Breaking changes and migration guides

As described in the breaking change policy, on occasion we publish guides for migrating code across a breaking change.

To be notified about future breaking changes, join the groups Flutter announce and Dart announce.

When facing Dart errors after upgrading Flutter, consider using the dart fix command to automatically migrate your code. Not every breaking change is supported in this way, but many are.

To avoid being broken by future versions of Flutter, consider submitting your tests to our test registry.

The following guides are available. They are sorted by release, and listed in alphabetical order:

• Rename MaterialState to WidgetState
• Introduce new ColorScheme roles
• Stop generating AssetManifest.json
• Rename MemoryAllocations to FlutterMemoryAllocations
• Deprecate TextField.canRequestFocus
• Nullable PageView.controller
• Deprecate ButtonBar in favor of OverflowBar
• Deprecated API removed after v3.19
• Dropping support for Android KitKat

• Deprecated API removed after v3.16
• Migrate RawKeyEvent/RawKeyboard system to KeyEvent/HardwareKeyboard system
• Deprecate imperative apply of Flutter's Gradle plugins
• Default multitouch scrolling
• Accessibility traversal order of tooltip changed

• Migrating to Material 3
• Migrate ShortcutActivator and ShortcutManager to KeyEvent system
• The ThemeData.useMaterial3 property is now set to true by default
• Deprecated API removed after v3.13
• Customize tabs alignment using the new TabBar.tabAlignment property
• Deprecate textScaleFactor in favor of TextScaler
• Android 14 nonlinear font scaling enabled
• Deprecate describeEnum and update EnumProperty to be type strict
• Deprecated just-in-time navigation pop APIs for Android Predictive Back
• Deprecated Paint.enableDithering
• Updated default text styles for menus
• Windows: External windows should notify Flutter engine of lifecycle changes
• Windows build path changed to add the target architecture

• Added missing dispose() for some disposable objects in Flutter
• Deprecated API removed after v3.10
• Added AppLifecycleState.hidden enum value
• Moved ReorderableListView's localized strings from material to widgets localizations
• Removed ignoringSemantics properties
• Deprecated RouteInformation.location and its related APIs
• Updated EditableText scroll into view behavior
• Migrate a Windows project to ensure the window is shown
• Updated Checkbox.fillColor behavior

• Dart 3 changes in Flutter v3.10 and later
• Deprecated API removed after v3.7
• Insert content text input client
• Deprecated the window singleton
• Resolve the Android Java Gradle error
• Require one data variant for ClipboardData constructor
• "Zone mismatch" message

• Deprecated API removed after v3.3
• Replaced parameters for customizing context menus with a generic widget builder
• iOS FlutterViewController splashScreenView made nullable
• Migrate of to non-nullable return values, and add maybeOf
• Removed RouteSettings.copyWith
• ThemeData's toggleableActiveColor property has been deprecated
• Migrate a Windows project to support dark title bars

• Adding ImageProvider.loadBuffer
• Default PrimaryScrollController on Desktop
• Trackpad gestures can trigger GestureRecognizer
• Migrate a Windows project to set version information

• Deprecated API removed after v2.10
• Migrate useDeleteButtonTooltip to deleteButtonTooltipMessage of Chips
• Page transitions replaced by ZoomPageTransitionsBuilder

• Deprecated API removed after v2.5
• Raw images on Web uses correct origin and colors
• Required Kotlin version
• Scribble Text Input Client

• Default drag scrolling devices
• Deprecated API removed after v2.2
• Change the enterText method to move the caret to the end of the input text
• GestureRecognizer cleanup
• Introducing package:flutter_lints
• Replace AnimationSheetBuilder.display with collate
• ThemeData's accent properties have been deprecated
• Transition of platform channel test interfaces to flutter_test package
• Using HTML slots to render platform views in the web
• Migrate a Windows project to the idiomatic run loop

The following breaking change was reverted in release 2.2:

Network Policy on iOS and Android

Introduced in version: 2.0.0
Reverted in version: 2.2.0 (proposed)

• Default Scrollbars on Desktop

• Added BuildContext parameter to TextEditingController.buildTextSpan
• Android ActivityControlSurface attachToActivity signature change
• Android FlutterMain.setIsRunningInRobolectricTest testing API removed
• Clip behavior
• Deprecated API removed after v1.22
• Dry layout support for RenderBox
• Eliminating nullOk Parameters
• Material Chip button semantics
• SnackBars managed by the ScaffoldMessenger
• TextSelectionTheme migration
• Transition of platform channel test interfaces to flutter_test package
• Use maxLengthEnforcement instead of maxLengthEnforced

• Android v1 embedding app and plugin creation deprecation
• Cupertino icons 1.0.0
• The new Form, FormField auto-validation API

• Actions API revision
• Adding TextInputClient.currentAutofillScope property
• New Buttons and Button Themes
• Dialogs' Default BorderRadius
• More Strict Assertions in the Navigator and the Hero Controller Scope
• The Route Transition record and Transition delegate updates
• The RenderEditable needs to be laid out before hit testing
• Reversing the dependency between the scheduler and services layer
• Semantics Order of the Overlay Entries in Modal Routes
• showAutocorrectionPromptRect method added to TextInputClient
• TestWidgetsFlutterBinding.clock
• TextField requires MaterialLocalizations

• Adding 'linux' and 'windows' to TargetPlatform enum
• Annotations return local position relative to object
• Container color optimization
• CupertinoTabBar requires Localizations parent
• Generic type of ParentDataWidget changed to ParentData
• ImageCache and ImageProvider changes
• ImageCache large images
• MouseTracker moved to rendering
• MouseTracker no longer attaches annotations
• Nullable CupertinoTheme.brightness
• Rebuild optimization for OverlayEntries and Routes
• Scrollable AlertDialog
• TestTextInput state reset
• TextInputClient currentTextEditingValue
• The forgetChild() method must call super
• The Route and Navigator refactoring
• FloatingActionButton and ThemeData's accent properties