Compose Animation

Structure

Compose is a combination of 7 Maven group IDs within androidx. Each group contains a targeted subset of functionality, each with its own set of release notes.

This table explains the groups and links to each set of release notes.

Declaring dependencies

To add a dependency on Compose, you must add the Google Maven repository to your project. Read Google's Maven repository for more information.

Add the dependencies for the artifacts you need in the build.gradle file for your app or module:

dependencies {
    implementation "androidx.compose.animation:animation:1.3.0-beta03"
}

android {
    buildFeatures {
        compose true
    }

    composeOptions {
        kotlinCompilerExtensionVersion = "1.3.0-beta03"
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }
}

dependencies {
    implementation("androidx.compose.animation:animation:1.3.0-beta03")
}

android {
    buildFeatures {
        compose = true
    }

    composeOptions {
        kotlinCompilerExtensionVersion = "1.3.0-beta03"
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }
}

For more information about dependencies, see Add build dependencies.

Feedback

Your feedback helps make Jetpack better. Let us know if you discover new issues or have ideas for improving this library. Please take a look at the existing issues in this library before you create a new one. You can add your vote to an existing issue by clicking the star button.

Create a new issue

See the Issue Tracker documentation for more information.

Version 1.3

Version 1.3.0-beta03

September 21, 2022

androidx.compose.animation:animation:1.3.0-beta03, androidx.compose.animation:animation-core:1.3.0-beta03, and androidx.compose.animation:animation-graphics:1.3.0-beta03 are released. Version 1.3.0-beta03 contains these commits.

• No changes since 1.3.0-beta02.

Version 1.3.0-beta02

September 7, 2022

androidx.compose.animation:animation:1.3.0-beta02, androidx.compose.animation:animation-core:1.3.0-beta02, and androidx.compose.animation:animation-graphics:1.3.0-beta02 are released. Version 1.3.0-beta02 contains these commits.

• Removed Kotlin.experimental from the compiler options since it is depricated

Version 1.3.0-beta01

August 24, 2022

androidx.compose.animation:animation:1.3.0-beta01, androidx.compose.animation:animation-core:1.3.0-beta01, and androidx.compose.animation:animation-graphics:1.3.0-beta01 are released. Version 1.3.0-beta01 contains these commits.

Version 1.3.0-alpha03

August 10, 2022

androidx.compose.animation:animation:1.3.0-alpha03, androidx.compose.animation:animation-core:1.3.0-alpha03, and androidx.compose.animation:animation-graphics:1.3.0-alpha03 are released. Version 1.3.0-alpha03 contains these commits.

API Changes

• New param in Crossfade, animateAsState and Animatable for tooling label (Iac08a)
• Added atFraction function for defining keyframes at a fraction instead of at a specific duration. (I20c76, b/232059455)

Version 1.3.0-alpha02

July 27, 2022

androidx.compose.animation:animation:1.3.0-alpha02, androidx.compose.animation:animation-core:1.3.0-alpha02, and androidx.compose.animation:animation-graphics:1.3.0-alpha02 are released. Version 1.3.0-alpha02 contains these commits.

Version 1.3.0-alpha01

June 29, 2022

androidx.compose.animation:animation:1.3.0-alpha01, androidx.compose.animation:animation-core:1.3.0-alpha01, and androidx.compose.animation:animation-graphics:1.3.0-alpha01 are released. Version 1.3.0-alpha01 contains these commits.

API Changes

• New LookaheadLayout that supports a lookahead pass before the actual measure/layout. This allows a pre-calculation of the layout when it changes, while permitting the post-lookahead measure/layout to use the pre-calculated size/position to animate the size and positions towards the target. SubcomposeLayouts are not yet supported, but will be in an upcoming release. (I477f5)

Version 1.2

Version 1.2.1

August 10, 2022

androidx.compose.animation:animation:1.2.1, androidx.compose.animation:animation-core:1.2.1, and androidx.compose.animation:animation-graphics:1.2.1 are released. Version 1.2.1 contains these commits.

Version 1.2.0

July 27, 2022

androidx.compose.animation:animation:1.2.0, androidx.compose.animation:animation-core:1.2.0, and androidx.compose.animation:animation-graphics:1.2.0 are released. Version 1.2.0 contains these commits.

Important changes since 1.1.0

• Compose animation now supports 'Animator duration scale' setting from Developer Options.
• A large selection of new experimental easing curves.
• AnimatedImageVector now supports repeatCount and repeatMode

Version 1.2.0-rc03

June 29, 2022

androidx.compose.animation:animation:1.2.0-rc03, androidx.compose.animation:animation-core:1.2.0-rc03, and androidx.compose.animation:animation-graphics:1.2.0-rc03 are released. Version 1.2.0-rc03 contains these commits.

• No changes since 1.2.0-rc02.

Version 1.2.0-rc02

June 22, 2022

androidx.compose.animation:animation:1.2.0-rc02, androidx.compose.animation:animation-core:1.2.0-rc02, and androidx.compose.animation:animation-graphics:1.2.0-rc02 are released. Version 1.2.0-rc02 contains these commits.

Bug Fixes

• Removed ExperimentalEasingApi annotation on Easing functions (Ied441)

Version 1.2.0-rc01

June 15, 2022

androidx.compose.animation:animation:1.2.0-rc01, androidx.compose.animation:animation-core:1.2.0-rc01, and androidx.compose.animation:animation-graphics:1.2.0-rc01 are released. Version 1.2.0-rc01 contains these commits.

API Changes

• Interfaces in compose libraries are now built using jdk8 default interface methods (I5bcf1)

Version 1.2.0-beta03

June 1, 2022

androidx.compose.animation:animation:1.2.0-beta03, androidx.compose.animation:animation-core:1.2.0-beta03, and androidx.compose.animation:animation-graphics:1.2.0-beta03 are released. Version 1.2.0-beta03 contains these commits.

API Changes

• Added Experimental Easing Curves for Animations (I64a38)

Version 1.2.0-beta02

May 18, 2022

androidx.compose.animation:animation:1.2.0-beta02, androidx.compose.animation:animation-core:1.2.0-beta02, and androidx.compose.animation:animation-graphics:1.2.0-beta02 are released. Version 1.2.0-beta02 contains these commits.

Version 1.2.0-beta01

May 11, 2022

androidx.compose.animation:animation:1.2.0-beta01, androidx.compose.animation:animation-core:1.2.0-beta01, and androidx.compose.animation:animation-graphics:1.2.0-beta01 are released. Version 1.2.0-beta01 contains these commits.

• This is the first beta release of 1.2! There are no changes since the last alpha.

Version 1.2.0-alpha08

April 20, 2022

androidx.compose.animation:animation:1.2.0-alpha08, androidx.compose.animation:animation-core:1.2.0-alpha08, and androidx.compose.animation:animation-graphics:1.2.0-alpha08 are released. Version 1.2.0-alpha08 contains these commits.

Version 1.2.0-alpha07

April 6, 2022

androidx.compose.animation:animation:1.2.0-alpha07, androidx.compose.animation:animation-core:1.2.0-alpha07, and androidx.compose.animation:animation-graphics:1.2.0-alpha07 are released. Version 1.2.0-alpha07 contains these commits.

API Changes

• AnimatedImageVector now supports repeatCount and repeatMode (Ia3e75, b/199304067)

Version 1.2.0-alpha06

March 23, 2022

androidx.compose.animation:animation:1.2.0-alpha06, androidx.compose.animation:animation-core:1.2.0-alpha06, and androidx.compose.animation:animation-graphics:1.2.0-alpha06 are released. Version 1.2.0-alpha06 contains these commits.

API Changes

• Updated parsing of vector drawables to support auto mirroring to flip the content of a VectorPainter if the current layout direction is RTL. (I79cd9, b/185760237)

Bug Fixes

• Updated Vector graphics APIs to use the proper composable annotation @VectorComposable instead of @UiComposable (I942bc)

Version 1.2.0-alpha05

March 9, 2022

androidx.compose.animation:animation:1.2.0-alpha05, androidx.compose.animation:animation-core:1.2.0-alpha05, and androidx.compose.animation:animation-graphics:1.2.0-alpha05 are released. Version 1.2.0-alpha05 contains these commits.

API Changes

• Hooray! Compose animation now supports 'Animator duration scale' setting from Developer Options. (I5a4fc, b/161675988)

Version 1.2.0-alpha04

February 23, 2022

androidx.compose.animation:animation:1.2.0-alpha04, androidx.compose.animation:animation-core:1.2.0-alpha04, and androidx.compose.animation:animation-graphics:1.2.0-alpha04 are released. Version 1.2.0-alpha04 contains these commits.

Version 1.2.0-alpha03

February 9, 2022

androidx.compose.animation:animation:1.2.0-alpha03, androidx.compose.animation:animation-core:1.2.0-alpha03, and androidx.compose.animation:animation-graphics:1.2.0-alpha03 are released. Version 1.2.0-alpha03 contains these commits.

Version 1.2.0-alpha02

January 26, 2022

androidx.compose.animation:animation:1.2.0-alpha02, androidx.compose.animation:animation-core:1.2.0-alpha02, and androidx.compose.animation:animation-graphics:1.2.0-alpha02 are released. Version 1.2.0-alpha02 contains these commits.

Version 1.2.0-alpha01

January 12, 2022

androidx.compose.animation:animation:1.2.0-alpha01, androidx.compose.animation:animation-core:1.2.0-alpha01, and androidx.compose.animation:animation-graphics:1.2.0-alpha01 are released. Version 1.2.0-alpha01 contains these commits.

API Changes

• Use AnimatedImageVector.animatedVectorResource instead of animatedVectorResource to load an <animated-vector> resource file.
  • Use rememberAnimatedVectorResource instead of AnimatedImageVector#painterFor to render an AnimatedImageVector. (I9c300)

Bug Fixes

• Add toString methods to Animatable and AnimationResult. (Icd3a6)

Dependency Updates

• Now depends on Kotlin 1.6.10.

Version 1.1

Version 1.1.1

February 23, 2022

androidx.compose.animation:animation:1.1.1, androidx.compose.animation:animation-core:1.1.1, and androidx.compose.animation:animation-graphics:1.1.1 are released. Version 1.1.1 contains these commits.

Bug Fixes

• Fix NullPointerException at androidx.compose.ui.platform.RenderNodeLayer.updateDisplayList (aosp/1947059, b/206677462)
• Fix crash caused by clipboard content while reading from clipboard on Android. (I06020, b/197769306)
• Fixed RTL in LazyVerticalGrid (aosp/1931080, b/207510535)

Version 1.1.0

February 9, 2022

androidx.compose.animation:animation:1.1.0, androidx.compose.animation:animation-core:1.1.0, and androidx.compose.animation:animation-graphics:1.1.0 are released. Version 1.1.0 contains these commits.

Important changes since 1.0.0

• Stable support for the Android 12 Overscroll effect
• Improvements to touch target sizing
• Note that, with respect to Compose 1.0, Material components will expand their layout space to meet Material accessibility guidelines for touch target size. For instance, Button touch target will expand to a minimum size of 48x48dp, even if you set the Button's size to be smaller. This aligns Compose Material to the same behavior of Material Design Components, providing consistent behavior if you mix Views and Compose. This change also ensures that when you create your UI using Compose Material components, minimum requirements for touch target accessibility will be met.
• Stable support for Navigation Rail
• Graduates a number of previously experimental APIs to stable
• Support for newer versions of Kotlin

Version 1.1.0-rc03

January 26, 2022

androidx.compose.animation:animation:1.1.0-rc03, androidx.compose.animation:animation-core:1.1.0-rc03, and androidx.compose.animation:animation-graphics:1.1.0-rc03 are released. Version 1.1.0-rc03 contains these commits.

Bug Fixes

• Updated to support Compose Material 1.1.0-rc03

Version 1.1.0-rc01

December 15, 2021

androidx.compose.animation:animation:1.1.0-rc01 and androidx.compose.animation:animation-core:1.1.0-rc01 are released. Version 1.1.0-rc01 contains these commits.

API Changes

• Use AnimatedImageVector.animatedVectorResource instead of animatedVectorResource to load an <animated-vector> resource file.
  • Use rememberAnimatedVectorResource instead of AnimatedImageVector#painterFor to render an AnimatedImageVector. (I9c300)

Version 1.1.0-beta04

December 1, 2021

androidx.compose.animation:animation:1.1.0-beta04, androidx.compose.animation:animation-core:1.1.0-beta04, and androidx.compose.animation:animation-graphics:1.1.0-beta04 are released. Version 1.1.0-beta04 contains these commits.

New Features

• Updated to be compatible with Kotlin 1.6.0

Version 1.1.0-beta03

November 17, 2021

androidx.compose.animation:animation:1.1.0-beta03, androidx.compose.animation:animation-core:1.1.0-beta03, and androidx.compose.animation:animation-graphics:1.1.0-beta03 are released. Version 1.1.0-beta03 contains these commits.

API Changes

• Added new modifier Modifier.onPlaced to allow placement change to be observed. Additional changes to child modifier's offset can therefore be made based on the observed placement change. (I558fd)

• New support for contentKey in Crossfade. ContentKey will be used for equality check by animation system. Therefore custom diffing on states can be achieved via specifying appropriate contentKey for different states.

  ContentKey will also be used as the key for save & restore content. (I2e055, b/197907070)

Version 1.1.0-beta02

November 3, 2021

androidx.compose.animation:animation:1.1.0-beta02, androidx.compose.animation:animation-core:1.1.0-beta02, and androidx.compose.animation:animation-graphics:1.1.0-beta02 are released. Version 1.1.0-beta02 contains these commits.

Bug Fixes

• New animation APIs for supporting tooling. Specifically, they allow tooling to inspect the animations & their configurations in a Transitions. (I4116e)

Version 1.1.0-beta01

October 27, 2021

androidx.compose.animation:animation:1.1.0-beta01, androidx.compose.animation:animation-core:1.1.0-beta01, and androidx.compose.animation:animation-graphics:1.1.0-beta01 are released. Version 1.1.0-beta01 contains these commits.

API Changes

• New animation APIs for supporting tooling. Specifically, they allow tooling to inspect the animations & their configurations in a Transitions. (I4116e)

Version 1.1.0-alpha06

October 13, 2021

androidx.compose.animation:animation:1.1.0-alpha06, androidx.compose.animation:animation-core:1.1.0-alpha06, and androidx.compose.animation:animation-graphics:1.1.0-alpha06 are released. Version 1.1.0-alpha06 contains these commits.

Version 1.1.0-alpha05

September 29, 2021

androidx.compose.animation:animation:1.1.0-alpha05, androidx.compose.animation:animation-core:1.1.0-alpha05, and androidx.compose.animation:animation-graphics:1.1.0-alpha05 are released. Version 1.1.0-alpha05 contains these commits.

API Changes

• EnterTransition, ExitTransition, and some of the AnimatedVisibility APIs have been made stable. MutableTransitionState.isIdle is also no longer experimental. (I5072d)

• Breaking change: lambdas in Enter/ExitTransition factories have been moved to the last position in the param list. (I5072d)

Version 1.1.0-alpha04

September 15, 2021

androidx.compose.animation:animation:1.1.0-alpha04, androidx.compose.animation:animation-core:1.1.0-alpha04, and androidx.compose.animation:animation-graphics:1.1.0-alpha04 are released. Version 1.1.0-alpha04 contains these commits.

Version 1.1.0-alpha03

September 1, 2021

androidx.compose.animation:animation:1.1.0-alpha03, androidx.compose.animation:animation-core:1.1.0-alpha03, and androidx.compose.animation:animation-graphics:1.1.0-alpha03 are released. Version 1.1.0-alpha03 contains these commits.

New Features

• Updated Compose 1.1.0-alpha03 to depend on Kotlin 1.5.30. (I74545)

Version 1.1.0-alpha02

August 18, 2021

androidx.compose.animation:animation:1.1.0-alpha02, androidx.compose.animation:animation-core:1.1.0-alpha02, and androidx.compose.animation:animation-graphics:1.1.0-alpha02 are released. Version 1.1.0-alpha02 contains these commits.

API Changes

• StartOffset is now supported in repeatable and infiniteRepeatable, as a way to delay the start time or fast forward the animation before the animation starts. This start offset will not be repeated (Ic679f, b/195079908)
• New Enter/Exit transition for scale. It can be used in combination with other types of Enter/ExitTransitions. (I372da, b/191325593)

Version 1.1.0-alpha01

August 4, 2021

androidx.compose.animation:animation:1.1.0-alpha01, androidx.compose.animation:animation-core:1.1.0-alpha01, and androidx.compose.animation:animation-graphics:1.1.0-alpha01 are released. Version 1.1.0-alpha01 contains these commits.

API Changes

• AnimatedImageVector and the related APIs are now in the new androidx.compose.animation:animation-graphics module. (I60873)

Bug Fixes

• Moved InfiniteAnimationPolicy to :compose:ui (I5eb09, b/160602714)

Version 1.0

Version 1.0.5

November 3, 2021

androidx.compose.animation:animation:1.0.5 and androidx.compose.animation:animation-core:1.0.5 are released. Version 1.0.5 contains these commits.

Bug Fixes

• Fixed a crash tracking derivedStateOf instances. (aosp/1792247)

Version 1.0.4

October 13, 2021

androidx.compose.animation:animation:1.0.4 and androidx.compose.animation:animation-core:1.0.4 are released. Version 1.0.4 contains these commits.

Dependency Updates

• Updated to depend on Kotlin 1.5.31

Version 1.0.3

September 29, 2021

androidx.compose.animation:animation:1.0.3 and androidx.compose.animation:animation-core:1.0.3 are released. Version 1.0.3 contains these commits.

Dependency Updates

• Updated to depend on Kotlin 1.5.30

Version 1.0.2

September 1, 2021

androidx.compose.animation:animation:1.0.2 and androidx.compose.animation:animation-core:1.0.2 are released. Version 1.0.2 contains these commits.

Updated to support the Compose 1.0.2 release. Compose 1.0.2 is still compatible with Kotlin 1.5.21.

Version 1.0.1

August 4, 2021

androidx.compose.animation:animation:1.0.1 and androidx.compose.animation:animation-core:1.0.1 are released. Version 1.0.1 contains these commits.

Dependency Updates

• Updated to depend on Kotlin 1.5.21.

Version 1.0.0

July 28, 2021

androidx.compose.animation:animation:1.0.0 and androidx.compose.animation:animation-core:1.0.0 are released. Version 1.0.0 contains these commits.

Major features of 1.0.0

This is the first stable release of Compose. Please see the official Compose Release blog for more details!

Known Issues

• If you are using Android Studio Bumblebee Canary 4 or AGP 7.1.0-alpha04/7.1.0-alpha05, you may hit the following crash:

    java.lang.AbstractMethodError: abstract method "void androidx.lifecycle.DefaultLifecycleObserver.onCreate(androidx.lifecycle.LifecycleOwner)"
  

  To fix, temporarily increase your minSdkVersion to 24+ in your build.gradle file. This issue will be fixed in the next version of Android Studio Bumblebee and AGP 7.1. (b/194289155)

Version 1.0.0-rc02

July 14, 2021

androidx.compose.animation:animation:1.0.0-rc02 and androidx.compose.animation:animation-core:1.0.0-rc02 are released. Version 1.0.0-rc02 contains these commits.

Version 1.0.0-rc01

July 1, 2021

androidx.compose.animation:animation:1.0.0-rc01 and androidx.compose.animation:animation-core:1.0.0-rc01 are released. Version 1.0.0-rc01 contains these commits.

Bug Fixes

• Moved InfiniteAnimationPolicy to androidx.compose.ui:ui (I5eb09, b/160602714)

Version 1.0.0-beta09

June 16, 2021

androidx.compose.animation:animation:1.0.0-beta09 and androidx.compose.animation:animation-core:1.0.0-beta09 are released. Version 1.0.0-beta09 contains these commits.

API Changes

• New AnimatedContent Composable. It manages its content change using customizable ContentTransform as new target content enters and initial content leaves. Different combination of enter and exit transitions can be used to produce a customized look and feel. As a part of the content transform, AnimatedContent automatically animates its size to match the incoming content. (I2c3df)
• Removed ManualFrameClock. If you need to control animations, use composeTestRule.mainClock instead. (I3c3e8, b/189951065)

Added Profile Rules

This release adds profile rules to the following compose modules (I14ed6):

• androidx.compose.animation
• androidx.compose.animation-core
• androidx.compose.foundation
• androidx.compose.foundation-layout
• androidx.compose.material
• androidx.compose.material-ripple
• androidx.compose.runtime
• androidx.compose.ui
• androidx.compose.ui.geometry
• androidx.compose.ui.graphics
• androidx.compose.ui.text
• androidx.compose.ui.text
• androidx.compose.ui.unit
• androidx.compose.ui.util

What are profile rules?

• Profile rules for a library are specified in a text file baseline-prof.txt located in the src/main or equivalent directory. The file specifies a rule per line, where a rule in this case is a pattern for matching to methods or classes in the library. The syntax for these rules is a superset of the human-readable ART profile format that is used when using adb shell profman --dump-classes-and-methods .... These rules take one of two forms to target either methods or classes.

• A method rule will have the following pattern:

  <FLAGS><CLASS_DESCRIPTOR>-><METHOD_SIGNATURE>
  

• And a class rule will have the following pattern:

  <CLASS_DESCRIPTOR>
  

• Here <FLAGS> is one or more of the characters H, S, and P to indicate whether or not this method should be flagged as "Hot", "Startup", or "Post Startup".

• The <CLASS_DESCRIPTOR> is the descriptor for the class that the targeted method belongs to. For example, the class androidx.compose.runtime.SlotTable would have a descriptor of Landroidx/compose/runtime/SlotTable;.

• The <METHOD_SIGNATURE> is the signature of the method, and includes the name, parameter types, and return types of the method. For example, the method fun isPlaced(): Boolean on LayoutNode has the signature isPlaced()Z.

• These patterns can have wildcards (**, *, and ?) in order to have a single rule encompass multiple methods or classes.

What do the rules do?

• A method that has the flag H indicates that this method is a "hot" method, and should be compiled ahead of time.

• A method that has the flag S indicates that it is a method which is called at startup, and should be compiled ahead of time to avoid the cost of compilation and interpreting the method at startup time.

• A method that has the flag P indicates that it is a method which is called after startup.

• A class that is present in this file indicates that it is used during startup and should be pre-allocated in the heap to avoid the cost of class loading.

How does this work?

• Libraries can define these rules which will be packaged in AAR artifacts. When an app is then built which includes these artifacts, these rules are merged together and the merged rules are used to build a compact binary ART profile that is specific to the app. ART can then leverage this profile when the app is installed on devices in order to ahead-of-time compile a specific subset of the application to improve the performance of the application, especially the first run. Note that this will have no effect on debuggable applications.

Version 1.0.0-beta08

June 2, 2021

androidx.compose.animation:animation:1.0.0-beta08 and androidx.compose.animation:animation-core:1.0.0-beta08 are released. Version 1.0.0-beta08 contains these commits.

Bug Fixes

• Now detectDragGesures, detectVerticalGestures, and detectHorizontalGestures will consume the position change automatically, no need to call change.consumePositionChange in the onDrag callbacks (I42fc4, b/185096350, b/187320697)
• Modifier.onGloballyPositioned() was changed to report the coordinates of this modifier in the modifier chain, not the layout coordinates after applying all the modifiers. This means that now the ordering of modifiers is affecting what coordinates would be reported. (Ieb67d, b/177926591)

Version 1.0.0-beta07

May 18, 2021

androidx.compose.animation:animation:1.0.0-beta07 and androidx.compose.animation:animation-core:1.0.0-beta07 are released. Version 1.0.0-beta07 contains these commits.

API Changes

• New AnimatedVisibility API that support visibility to be specified in a MutableTransitionState. This also allows the animation states to be observed external to AnimatedVisibility via currentState and isIdle.
  • New child transition support in Transition
  • Support custom exit/enter transition animation in AnimatedVisibility using AnimationScope.transition
  • New animateEnterExit modifier accessible for all children of AnimatedVisibility
  • Deprecated the AnimatedVisibility APIs that take an initiallyVisible parameter (I702f3)

Version 1.0.0-beta06

May 5, 2021

androidx.compose.animation:animation:1.0.0-beta06 and androidx.compose.animation:animation-core:1.0.0-beta06 are released. Version 1.0.0-beta06 contains these commits.

Version 1.0.0-beta05

April 21, 2021

androidx.compose.animation:animation:1.0.0-beta05 and androidx.compose.animation:animation-core:1.0.0-beta05 are released. Version 1.0.0-beta05 contains these commits.

Bug Fixes

• The AndroidManifest files from ui-test-manifest and ui-tooling-data are now compatible with Android 12 (I6f9de, b/184718994)

Version 1.0.0-beta04

April 7, 2021

androidx.compose.animation:animation:1.0.0-beta04 and androidx.compose.animation:animation-core:1.0.0-beta04 are released. Version 1.0.0-beta04 contains these commits.

API Changes

• Public instances of RowScope, ColumnScope, BoxScope, BoxWithConstraintsScope were removed. (I4e83e, b/181869067)

Version 1.0.0-beta03

March 24, 2021

androidx.compose.animation:animation:1.0.0-beta03 and androidx.compose.animation:animation-core:1.0.0-beta03 are released. Version 1.0.0-beta03 contains these commits.

Version 1.0.0-beta02

March 10, 2021

androidx.compose.animation:animation:1.0.0-beta02 and androidx.compose.animation:animation-core:1.0.0-beta02 are released. Version 1.0.0-beta02 contains these commits.

Bug Fixes

• Enforce restrictions on public usage of experimental APIs (I6aa29, b/174531520)

Version 1.0.0-beta01

February 24, 2021

androidx.compose.animation:animation:1.0.0-beta01 and androidx.compose.animation:animation-core:1.0.0-beta01 are released. Version 1.0.0-beta01 contains these commits.

This is the first release of Compose 1.0.0 Beta.

API Changes

• InteractionState has been replaced with [Mutable]InteractionSource
  • Interfaces are responsible for emitting / collecting Interaction events.
  • Instead of passing interactionState = remember { InteractionState() } to components such as Button and Modifier.clickable(), use interactionSource = remember { MutableInteractionSource() }.
  • Instead of: Interaction.Pressed in interactionState you should instead use the extension functions on InteractionSource, such as InteractionSource.collectIsPressedAsState().
  • For complex use cases you can use InteractionSource.interactions to observe the stream of Interactions. See the InteractionSource documentation and samples for more information.
  • (I85965, b/152525426, b/171913923, b/171710801, b/174852378)
• smoothScrollBy and scrollBy methods' packages changed to androidx.compose.foundation.gestures.* (I3f7c1, b/175294473)
• Size modifiers were renamed. Modifier.width/height/size were renamed to requiredWidth/requiredHeight/requiredSize. Modifier.preferredWidth/preferredHeight/preferredSize were renamed to width/height/size. (I5b414)
• Orientation has been moved to foundation package. VelocirtTracker moved from ui.gesture to ui.input.pointer. (Iff4a8, b/175294473)
• AnimationClockObservable and subclasses have been removed. AnimatedFloat has been removed. (Icde52, b/177457083)
• Modifier.draggable now accepts DraggableState instead of a simple lambda. you can create state via rememberDraggableState { delta -> } to get the same behaviour as before (Ica70f, b/175294473)
• animate, animatedValue, AnimatedValue APIs have been removed (If27bc, b/177457083)
• AnimationEndReason.Interrupted is removed. CancellationException will be throws if animation is interrupted. (I2cbbc, b/179695417)
• TargetAnimation API has been removed. (If47d1, b/177457083)

Version 1.0.0-alpha12

February 10, 2021

androidx.compose.animation:animation:1.0.0-alpha12 and androidx.compose.animation:animation-core:1.0.0-alpha12 are released. Version 1.0.0-alpha12 contains these commits.

API Changes

• Modifier.pointerInput now requires remember keys to indicate when the pointer input detection coroutine should restart for new dependencies. (I849cd)
• Bounds has been renamed to DpRect (I4b32a)
• Unified the param name for AnimationSpec to animationSpec across the animation system. Also constrain the Enter/ExitTransition to accept FiniteAnimationSpec. (Ie47c5, b/177457083)
• Animatable.snapTo and Animatable.stop are now suspend functions (If4288)
• Similarly to how we previously removed state { 0 } composable and now promote usage like remember { mutableStateOf(0) } we are going to remove savedInstanceState { 0 } composable. You should use rememberSaveable { mutableStateOf(0) } instead and it will save and restore automatically if the type used inside the MutableState can be stored in the Bundle. If previously you were passing a custom saver object now you need to use a new overload of rememberSaveable which has stateSaver parameter. The usage will look like this: val holder = rememberSaveable(stateSaver = HolderSaver) { mutableStateOf(Holder(0)) } (Ib4c26, b/177338004)
• Updated Crossfade's method signature to be more consistent with the rest of the animation system. (Ib05ed, b/177457083)
• rememberSavedInstanceState() was renamed to rememberSaveable() and moved to androidx.compose.runtime.saveable package. (I1366e, b/177338004)
• RestorableStateHolder was renamed to SaveableStateHolder and moved to androidx.compose.runtime.saveable package. Inner method RestorableStateProvider was renamed to SaveableStateProvider. Generic type was removed so you can just pass Any as a key. Experimental annotation is not needed anymore. (I0902e, b/174598702)
• Updated Modifier.animateContentSize API to be consistent with the rest of the animation system. (I0bf75, b/177457083)
• AnimatedValue/Float is now deprecated. Please use Animatable instead. (I71345, b/177457083)
• tapGestureFilter, doubleTapGestureFilter, longPressGestureFilter and pressIndicaitonGestureFilter have been deprecated. Use Modifier.clickable or Modifier.pointerInput with detectTapGestures function instead. (I6baf9, b/175294473)
• Introduced an InfiniteAnimationPolicy coroutine context element that will be applied in infinite animations. By default no policy is installed, except when running tests with ComposeTestRule. (I50ec4, b/151940543)
• Destructuring and copy() methods have been removed from several classes where they were rarely used. (I26702, b/178659281)
• Playtime in animation is now unfiied to nanoseconds (If776a)
• The compose:runtime-dispatch artifact is now deprecated. MonotonicFrameClock can now be found in compose:runtime and AndroidUiDispatcher can be found in compose:ui. (Ib5c36)
• Added Animation.isInfinite and VectorizedAnimationSpec.isInfinite that signal if an animation is infinite or not. This can be used in implementations of animations to have special handling of such animations. For example, a special "time remaining" message can be shown, or during tests the animation can be cancelled to prevent waiting for idleness indefinitely. (Iebb05, b/151940543)
• Use Long instead of Uptime as animation time type (Ie3aa7, b/177420019)

Version 1.0.0-alpha11

January 28, 2021

androidx.compose.animation:animation:1.0.0-alpha11 and androidx.compose.animation:animation-core:1.0.0-alpha11 are released. Version 1.0.0-alpha11 contains these commits.

API Changes

• TransitionDefinition-based Transition has been deprecated (I0ac57)
• A label field is added for Transition and child animations to be displayed in tools (I619fb)
• animateAsState is now animateFooAsState, where Foo is the type of the variable being animated. e.g. Float, Dp, Offset, etc (Ie7e25)
• New InfiniteTransition that runs any number of child animations. (I1da81)
• Changes Material stateful parameter interfaces to have @Composable functions that return State<T>. Adds Animatable.asState() to make it easier to convert an Animatable to a State. Also changes animateElevation to be a suspend extension on Animatable. (If613c)

Bug Fixes

• onCommit, onDispose, and onActive have been deprecated in favor of SideEffect and DisposableEffect APIs (If760e)
• Initial State in updateTransition is now supported (Ifd51d)
• Content description parameter has been added to the Image and Icon. It is used to provide description to the accessibility services (I2ac4c)
• invalidate and compositionReference() are now deprecated in favor of currentRecomposeScope and rememberCompositionReference respectively. (I583a8)
• Duration and Uptime will be replace with Long milliseconds, and this step removes the dependency of pointer input on those classes. (Ia33b2, b/175142755, b/177420019)
• clickable, toggleable and selectable can be created outside of composition now (I0a130, b/172938345, b/175294473)
• Easing has been changed to a functional interface (Ib14e5)
• New items(count: Int) factory method for scope of LazyColumn/LazyRow/LazyVerticalGrid. items(items: List) and itemsIndexed(items: List) are now extension functions so you have to manually import them when used. New extension overloads for Arrays: items(items: Array) and itemsIndexed(Array) (I803fc, b/175562574)
• Leverage TestCoroutineDispatcher in testing (I532b6)
• Removed PointerInputData and modified PointerInputChange to give it all of PointerInputData's fields. Made PointerInputEvent and PointerInputEventData internal because they aren't used in any public API. (Ifff97, b/175142755)

Version 1.0.0-alpha10

January 13, 2021

androidx.compose.animation:animation:1.0.0-alpha10 and androidx.compose.animation:animation-core:1.0.0-alpha10 are released. Version 1.0.0-alpha10 contains these commits.

API Changes

• Modified Velocity to have component parts and mathematical operations. (Ib0447)
• Renamed @ExperimentalTesting to @ExperimentalTestApi to be consistent with similar experimental api annotations (Ia4502, b/171464963)
• Renamed Position to DpOffset and removed getDistance() (Ib2dfd)
• Removed Any.identityHashCode() public api (I025d7)

Bug Fixes

• New coroutine-based API Animatable that ensures mutual exclusiveness among its animations. New DecayAnimationSpec to support multi-dimensional decay animation (I820f2, b/168014930)
• animate() is now replaced with animateAsState(), which returns a State<T> instead of T. This allows better performance, as the invalidation scope can be narrowed down to where the State value is read. (Ib179e)

Version 1.0.0-alpha09

December 16, 2020

androidx.compose.animation:animation:1.0.0-alpha09 and androidx.compose.animation:animation-core:1.0.0-alpha09 are released. Version 1.0.0-alpha09 contains these commits.

API Changes

• Moved Dp.VectorConverter, Position.VectorConverter, etc to animation-core, and deprecated the old VectorConveters (If0c4b)
• Introduced a whole new set of Transition APIs with improved ease of use, and support for dynamically added animations, and dynamically calculated animation targets. This APIs are marked experimental for easy differentiation from the TransitionDefinition-based API. (Ia7fe3)

Bug Fixes

• Lambdas in offset modifiers now return IntOffset rather than Float. (Ic9ee5, b/174137212, b/174146755)
• Deprecate LazyColumnFor, LazyRowFor, LazyColumnForIndexed and LazyRowForIndexed. Use LazyColumn and LazyRow instead (I5b48c)
• For suspending pointer input APIs, renamed HandlePointerInputScope to AwaitPointerEventScope and handlePointerInput() to awaitPointerEventScope(). (Idf0a1, b/175142755)
• New infiniteRepeatable function for creating an InfiniteRepeatableSpec (I668e5)
• Removed ExperimentalPointerInput annotation (Ia7a24)

Version 1.0.0-alpha08

December 2, 2020

androidx.compose.animation:animation:1.0.0-alpha08 and androidx.compose.animation:animation-core:1.0.0-alpha08 are released. Version 1.0.0-alpha08 contains these commits.

API Changes

• Added lint check for composable lambda parameter naming and position, to check for consistency with Compose guidelines. Also migrated some APIs using children as the name for their trailing lambda to content, according to the lint check and guidance. (Iec48e)
• Previously Deprecated APIs were removed:
  • Modifier.onPositioned was removed, use Modifier.onGloballyPositioned.
  • Modifier.onDraw was removed, use Modifier.onDrawBehind.
  • Modifier.plus was removed, use Modifier.then.
  • Color.Unset was removed, use Color.Unspecified.
  • PxBounds class was removed, use Rect instead.
  • (Ie9d02, b/172562222)
• Temporarily added option to let the TestAnimationClock be driven by the MonotonicFrameClock (I1403b, b/173402197)

Bug Fixes

• Renamed Modifier.drawLayer to Modifier.graphicsLayer Also updated related classes to GraphicsLayer as per API council feedback. (I0bd29, b/173834241)
• Added Modifier.scale/rotate APIs as conveniences for drawLayer.
  • Renamed Modifier.drawOpacity to Modifier.alpha
  • Renamed Modifier.drawShadow to Modifier.shadow (I264ca, b/173208140)
• Made PointerInputData's uptime and position fields non-nullable. (Id468a)
• offsetPx modifiers were renamed to offset. They are now taking lambda parameters instead of State. (Ic3021, b/173594846)
• New APIs for running animations in coroutines (Ied662)
• Deprecated Ambients named with Ambient as their suffix, and replaced them with new properties prefixed with Ambient, following other Ambients and Compose API guidelines. (I33440)
• Time control in tests (TestAnimationClock and its usages) is now experimental (I6ef86, b/171378521)
• Remove old ui-test module and its stubs (I3a7cb)
• RestorableStateHolder.withRestorableState function was renamed to RestorableStateProvider (I66640)
• The Alignment interface was updated and made functional. (I46a07, b/172311734)

Version 1.0.0-alpha07

November 11, 2020

androidx.compose.animation:animation:1.0.0-alpha07 and androidx.compose.animation:animation-core:1.0.0-alpha07 are released. Version 1.0.0-alpha07 contains these commits.

Bug Fixes

• The foundation AmbientTextStyle, ProvideTextStyle, and AmbientContentColor have been deprecated. Instead use the new versions available in the Material library. For non-Material applications, you should instead create your own design system specific theming ambients that can be consumed in your own components. (I74acc, b/172067770)
• foundation.Text has been deprecated and replaced with material.Text. For a basic, unopinionated text API that does not consume values from a theme, see androidx.compose.foundation.BasicText. (If64cb)
• MeasureResult was moved out of MeasureScope. (Ibf96d, b/171184002)
• Several layout related symbols were moved from androidx.compose.ui to androidx.compose.layout.ui. (I0fa98, b/170475424)

Version 1.0.0-alpha06

October 28, 2020

androidx.compose.animation:animation:1.0.0-alpha06 and androidx.compose.animation:animation-core:1.0.0-alpha06 are released. Version 1.0.0-alpha06 contains these commits.

API Changes

• Enable transitions in ComposeTestRule; remove option to enable the blinking cursor from ComposeTestRule. (If0de3)

Version 1.0.0-alpha05

October 14, 2020

androidx.compose.animation:animation:1.0.0-alpha05 and androidx.compose.animation:animation-core:1.0.0-alpha05 are released. Version 1.0.0-alpha05 contains these commits.

API Changes

• New Animation interface and subclasses: These classes store the start and end conditions for animations, and therefore allow value and velocity to be queried via only playtime (Ie95bd, b/163329867)

Bug Fixes

• OnPositionedModifier is renamed to OnGloballyPositionedModifier and onPositioned() is renamed to onGloballyPositioned(). (I587e8, b/169083903)

• Deprecates contentColor() and currentTextStyle() APIs, and replaces them with AmbientContentColor and AmbientTextStyle ambients respectively. You can access the current value by using .current on the ambient property, as with any other ambient. This was change was made for consistency and to avoid having multiple ways to accomplish the same thing. Additionally renames some ambient properties to better describe their purpose as follows:

  • ContentColorAmbient -> AmbientContentColor
  • TextStyleAmbient -> AmbientTextStyle
  • IndicationAmbient -> AmbientIndication
  • EmphasisAmbient -> AmbientEmphasisLevels
  • RippleThemeAmbient -> AmbientRippleTheme (I37b6d)

Version 1.0.0-alpha04

October 1, 2020

androidx.compose.animation:animation:1.0.0-alpha04 and androidx.compose.animation:animation-core:1.0.0-alpha04 are released. Version 1.0.0-alpha04 contains these commits.

API Changes

• Annotated rootAnimationClockFactory, transitionsEnabled, blinkingCursorEnabled and textInputServiceFactory with @VisibleForTesting, make them internal API and hide their kdoc (I554eb, b/168308412)

Bug Fixes

• Updated many Graphics APIs
  • Updated scale and rotation transformation APIs to consume a single Offset parameter to represent the pivot coordinate instead of separate float parameters for the x/y coordinates in DrawScope and DrawTransform
  • Removed Rect.expandToInclude and Rect.join methods
  • Updated Radius documentation to say oval in addition to elliptical
  • Added documentation to indicate the public constructor for the inline Radius class is not to be called directly but instead Radius objects should be instantiated through their function constructors
  • Removed RoundRect APIs to query topRight, bottomRight, bottomCenter, etc.
  • Deprecated Rect.shift in favor of Rect.translate
  • Removed RoundRect.grow and Rect.shrink APIs
  • Renamed RoundRect.outerRect to Rect.boundingRect
  • Removed RoundRect.middleRect/tallMiddleRect/wideMiddleRect and Rect.isStadium methods
  • Renamed RoundRect.longestSide to RoundRect.maxDimension
  • Renamed RoundRect.shortestSide to RoundRect.minDimension
  • Changed RoundRect.center to be a property instead of a function
  • Updated RoundRect constructor to consume Radius properties instead of individual parameters for x/y radius values
  • Removed Size APIs that assumed it was a Rectangle with origin at 0,0
  • Added a destructing API to Radius
  • Migrated various RoundRect extension functions to be properties instead
  • (I8f5c7, b/168762961)
• foundation.Box was deprecated. Please use foundation.layout.Box instead. (Ie5950, b/167680279)
• Stack was renamed to Box. The previously existing Box will be deprecated in favor of the new Box in compose.foundation.layout. The behavior of the new Box is to stack children one on top of another when it has multiple children - this is different from the previous Box, which was behaving similar to a Column. (I94893, b/167680279)
• Box decoration parameters have been deprecated. If you want to have decorations/padding on your box, use Modifiers instead (Modifier.background, Modifier.border, Modifier.padding) (Ibae92, b/167680279)
• We prevented static imports of contents of layout scopes (e.g. alignWithSiblings in RowScope). The explicit scope alternative should be used instead: with(RowScope) { Modifier.alignWithSiblings(FirstBaseline) }. (I216be, b/166760797)

Version 1.0.0-alpha03

September 16, 2020

androidx.compose.animation:animation:1.0.0-alpha03 and androidx.compose.animation:animation-core:1.0.0-alpha03 are released. Version 1.0.0-alpha03 contains these commits.

Bug Fixes

• Usages of gravity were consistently renamed to align or alignment in layout APIs. (I2421a, b/164077038)

Version 1.0.0-alpha02

September 2, 2020

androidx.compose.animation:animation:1.0.0-alpha02 and androidx.compose.animation:animation-core:1.0.0-alpha02 are released. Version 1.0.0-alpha02 contains these commits.

API Changes

• Added ManualFrameClock.hasAwaiters to see if anything is awaiting a frame from that clock; runWithManualClock as a replacement for runBlocking when running tests that need a ManualFrameClock; TestUiDispatcher.Main that gives easy access to the main UI dispatcher in your tests.

  For example:

  @Test
  fun myTest() = runWithManualClock { clock ->
      // set some compose content
      withContext(TestUiDispatcher.Main) {
          clock.advanceClock(1000L)
      }
      if (clock.hasAwaiters) {
          println("The clock has awaiters")
      } else {
          println("The clock has no more awaiters")
      }
  }
  

  (I0a85b, b/161247083)

Bug Fixes

• onPreCommit is deprecated; onCommit now has onPreCommit's behavior.

  onCommit and onActive now run in the same choreographer frame that the composition changes committed in rather than at the beginning of the next choreographer frame. (I70403)

Version 1.0.0-alpha01

August 26, 2020

androidx.compose.animation:animation:1.0.0-alpha01 and androidx.compose.animation:animation-core:1.0.0-alpha01 are released. Version 1.0.0-alpha01 contains these commits.

Version 0.1.0-dev

Version 0.1.0-dev17

August 19, 2020

androidx.compose.animation:animation:0.1.0-dev17 and androidx.compose.animation:animation-core:0.1.0-dev17 are released. Version 0.1.0-dev17 contains these commits.

New Features

API Changes

• Offset has become an inline class (Iaec70)
• IntOffset is now an inline class (Iac0bf)
• IntSize is now an inline class (I2bf42)

• AnimatedVisibilty composable animates the appearance and disappearance of the child content.

  EnterTransition and ExitTransition are introduced to work with AnimatedVisibilty composable to provide 3 different typs of appearance and disappearance animation: fade, slide, and expand/shrink the content. The different types of animations can be combined to achieve more bespoke look and feel. (Idda11)

• Deprecated PxBounds in favor of Rect. Updated all usages of PxBounds with rect and added proper deprecate/replace with annotations to assist with the migration. (I37038, b/162627058)

Bug Fixes

• PlacementScope.placeAbsolute() was renamed to PlacementScope.place(), and the previous PlacementScope.place() was renamed to PlacementScope.placeRelative(). As a result, the PlacementScope.place() method will not automatically mirror the position in right-to-left contexts anymore. If this is desired, use PlacementScope.placeRelative() instead. (I873ac, b/162916675)
• The state { ... } composable is now deprecated in favor of explicit calls to remember { mutableStateOf(...) } for clarity. This reduces the overall API surface and number of concepts for state management, and matches the by mutableStateOf() pattern for class property delegation. (Ia5727)

Version 0.1.0-dev16

August 5, 2020

androidx.compose.animation:animation:0.1.0-dev16 and androidx.compose.animation:animation-core:0.1.0-dev16 are released. Version 0.1.0-dev16 contains these commits.

API Changes

• Built-in vector converters to convert built-in units are now accessible via Foo.VectorConverter. e.g. Dp.VectorConverter, Color.VectorConverter, Float.VectorConverter, etc (I3e273)
• Support end listener in Modifier.animateContentSize() such that when size change animation finishes, the listener will be notified, along with start/end size of the animation. (I277b2)
• New animateContentSize modifier that animates the layout size change of its child modifier (Ieffdc)

• Added MonotonicFrameAnimationClock that enables you to use a MonotonicFrameClock as an AnimationClockObservable to bridge the gap between the new coroutines based clocks and APIs that still use the old callback based clocks.

  The MonotonicFrameClockequivalent of ManualAnimationClock is now ManualFrameClock. (I111c7, b/161247083)

Bug Fixes

• The APIs for right-to-left support has been updated. LayoutDirectionAmbient has been added, which can be used to read and change the layout direction. Modifier.rtl and Modifier.ltr have been removed. (I080b3)
• Require type T to be explicitly specified for transitionDefinition. (I1aded)
• foundation.shape.corner package were flatten to foundation.share (I46491, b/161887429)
• Modifier.plus has been deprecated, use Modifier.then instead. 'Then' has a stronger signal of ordering, while also prohibits to type Modifier.padding().background() + anotherModifier, which breaks the chain and harder to read (Iedd58, b/161529964)
• Modifier.drawBackground has been renamed to Modifier.background (I13677)

Version 0.1.0-dev15

July 22, 2020

androidx.compose.animation:animation:0.1.0-dev15 and androidx.compose.animation:animation-core:0.1.0-dev15 are released. Version 0.1.0-dev15 contains these commits.

Dependencies Update

• To use the 0.1.0-dev15 version of Compose, you will need to update your dependencies according to the new code snippets shown above in Declaring dependencies.

API Changes

• Transition API has been changed to return a TransitionState instead of passing the TransitionState to children. This makes the API more consistent with animate() APIs. (I24e38)
• Modifier parameter added for Crossfade (I87cfe, b/159706180)
• Use AnimationSpec instead of AnimationBuilder in the top level APIs to clarify the concept of static animation specification
  • Improve the transition DSL by removing the lambda requirement for creating AnimationSpecs such as tween, spring. They instead take constructor params directly.
  • Improve the overall ease of use of AnimationSpec opening up constructors instead of relying on builders
  • Change the duration and delay for KeyFrames and Tween to Int. This eliminates unnecessary type casts and method overloading (for supporting both Long and Int). (Ica0b4)
• Replaced usage of IntPx with Int. Replaced IntPxPosition with IntOffset. Replaced IntPxSize with IntSize. (Ib7b44)
• In order to consolidate the number of classes used to represent sizing information, standardize on usage of the Size class instead of PxSize. This provides the benefits of an inline class to leverage a long to pack 2 float values to represent width and height represented as floats. (Ic0191)
• In order to consolidate the number of classes used to represent positioning information, standardize on usage of the Offset class instead of PxPosition. This provides the benefits of an inline class to leverage a long to pack 2 float values to represent x and y offsets represented as floats. (I3ad98)
• Replaced usage of Px class in various compose classes as part of the large refactoring effort to only rely on Dp and primitive types for pixel parameters (I086f4)
• Added animate() support for Dp, Px, Size, Position, Bounds, PxPosition, PxSize, PxBounds, IntPx, IntPxSize, IntPxPosition, IntPxBounds, and AnimationVector (Ib7518)
• Crossfade now accepts optional AnimationBuilder param to allow configuring the animation (I6d6e0)
• Replaced all nullable Color uses in API with non-nullable and use Color.Unset instead of null (Iabaa7)
• Removed ValueHolder class. Restructured AnimatedValue, AnimatedFloat classes to make the animation value field abstract so that subclasses can watch the value update.
  • Added model classes for AnimatedValue, AnimatedFloat, etc.
  • Added a new set of light-weight @Composable API for animating between values. (I79530)
• Breaking changes to the ambients API. See log and Ambient<T> documentation for details (I4c7ee, b/143769776)
• New repeat mode: Reverse. This mode reverses the previous iteration as the animation repeats in RepeatableSpec or VectorizedRepeatableSpec. (Ibe0f5)
• API additions to ManualAnimationClock: hasObservers: Boolean and constructor parameter dispatchOnSubscribe: Boolean (Iaa134)
• Added APIs for getting min/max bounds in AnimatedFloat (Icd9cc)

Bug Fixes

• runOnIdleCompose renamed to runOnIdle (I83607)
• Several testing APIs were renamed to be more intuitive. All findXYZ APIs were renamed to onNodeXYZ. All doXYZ APIs were renamed to performXYZ. (I7f164)
• Introduced low level stateless animation APIs. These APIs (I63bf7)
• The Recompose composable is no longer a useful abstraction. Most recomposition should happen as a result of MutableState assignments. For anything beyond that, it is recommended that you use the invalidate function to trigger a recomposition of the current scope. (Ifc992)
• Replaced usage of Px class in various compose classes as part of the large refactoring effort to only rely on Dp and primitive types for pixel parameters. Deleted Px class in its entirety (I3ff33)
• Replaced usage of Px class in various compose classes as part of the large refactoring effort to only rely on Dp and primitive types for pixel parameters (Id3434)
• Crossfade can now work with null as initial value (Iad6a4, b/155947711)
• Replaced usage of Px class in various compose classes as part of the large refactoring effort to only rely on Dp and primitive types for pixel parameters (I19d02)
• Consolidated CanvasScope implementations so there is now just DrawScope and ContentDrawScope Renamed CanvasScope to DrawScope. Updated DrawScope to implement Density interface and provide LayoutDirection Deleted DrawScope subclass in ContentDrawScope Painter and PainterModifier have been updated to no longer maintain an RTL property themselves as DrawScope provides this already without manually providing it (I1798e)
• Updated higher level compose APIs that expose a Canvas to expose CanvasScope instead. This removes the need for consumers to maintain their own Paint objects. For consumers that still require access to a Canvas they can use the drawCanvas extension method which provides a callback to issue drawing commands with the underlying Canvas. (I80afd)
• Added verticalGravity and horizontalGravity parameters to Row and Column, respectively. (I7dc5a)
• ui-text module is renamed as ui-text-core (I57dec)
• Improve DrawModifier API:
  • Made the receiver scope for draw() ContentDrawScope
  • Removed all parameters on draw()
  • DrawScope has same interface as former CanvasScope
  • ContentDrawScope has drawContent() method (Ibaced, b/152919067)
• runOnIdleCompose and runOnUiThread are now global functions instead of methods on ComposeTestRule. (Icbe8f)
• [Mutable]State property delegate operators moved to extensions to support Kotlin 1.4 property delegate optimizations. Callers must add imports to continue using by state { ... } or by mutableStateOf(...). (I5312c)
• ColoredRect has been deprecated. Use Box(Modifier.preferredSize(width, height).drawBackground(color)) instead. (I499fa, b/152753731)
• Replaced Modifier plus operator with factory extension functions (I225e4)
• Deprecated Center composable. It should be replaced either with the LayoutSize.Fill + LayoutAlign.Center modifier, or with one of the Box or Stack composables with suitable modifiers applied (Idf5e0)
• Renamed LayoutFlexible to LayoutWeight. Renamed tight parameter to fill. (If4738)
• The Opacity composable function has been replaced with the drawOpacity modifier. (I5fb62)
• Tests using AndroidComposeTestRule now provide an animation clock at the root of the composition that allows it to be paused, resumed and advanced manually. (Id54c5)
• Support right-to-left direction in LayoutPadding modifier (I9e8da)
• Density and DensityScope were merged into one interface. Instead of ambientDensity() you can now use DensityAmbient.current. Instead of withDensity(density) just with(density) (I11cb1)
• Added copy methods to various inline class types including:
  • Offset
  • Size
  • Radius
  • Motion
  • TransformOrigin
  • Deprecated Size.copy companion object method favor of instance copy method (Ife290, b/159905651)
• androidx.compose.ViewComposer has been moved to androidx.ui.node.UiComposer androidx.compose.Emittable has been removed. It was redundant with ComponentNode. androidx.compose.ViewAdapters has been removed. They are no longer a supported use case. Compose.composeInto has been deprecated. Use setContent or setViewContent instead. Compose.disposeComposition has been deprecated. Use the dispose method on the Composition returned by setContent instead. androidx.compose.Compose.subcomposeInto has moved to androidx.ui.core.subcomposeInto ComponentNode#emitInsertAt has been renamed to ComponentNode#insertAt ComponentNode#emitRemoveAt has been renamed to ComponentNode#removeAt ComponentNode#emitMode has been renamed to ComponentNode#move (Idef00)