Compose Runtime
androidx.compose.runtime
androidx.compose.runtime.rxjava2
androidx.compose.runtime.rxjava3
androidx.compose.runtime.saveable
androidx.compose.runtime.snapshots
(See the API reference docs for all compose packages)
Latest Update | Stable Release | Release Candidate | Beta Release | Alpha Release |
---|---|---|---|---|
October 2, 2024 | 1.7.3 | - | - | 1.8.0-alpha03 |
Structure
Compose is 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.
Group | Description |
---|---|
compose.animation | Build animations in their Jetpack Compose applications to enrich the user experience. |
compose.compiler | Transform @Composable functions and enable optimizations with a Kotlin compiler plugin. |
compose.foundation | Write Jetpack Compose applications with ready to use building blocks and extend foundation to build your own design system pieces. |
compose.material | Build Jetpack Compose UIs with ready to use Material Design Components. This is the higher level entry point of Compose, designed to provide components that match those described at www.material.io. |
compose.material3 | Build Jetpack Compose UIs with Material Design 3 Components, the next evolution of Material Design. Material 3 includes updated theming and components and Material You personalization features like dynamic color, and is designed to be cohesive with the new Android 12 visual style and system UI. |
compose.runtime | Fundamental building blocks of Compose's programming model and state management, and core runtime for the Compose Compiler Plugin to target. |
compose.ui | Fundamental components of compose UI needed to interact with the device, including layout, drawing, and input. |
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:
Groovy
dependencies { implementation "androidx.compose.runtime:runtime:1.7.3" implementation "androidx.compose.runtime:runtime-livedata:1.7.3" implementation "androidx.compose.runtime:runtime-rxjava2:1.7.3" } android { buildFeatures { compose true } composeOptions { kotlinCompilerExtensionVersion = "1.5.15" } kotlinOptions { jvmTarget = "1.8" } }
Kotlin
dependencies { implementation("androidx.compose.runtime:runtime:1.7.3") implementation("androidx.compose.runtime:runtime-livedata:1.7.3") implementation("androidx.compose.runtime:runtime-rxjava2:1.7.3") } android { buildFeatures { compose = true } composeOptions { kotlinCompilerExtensionVersion = "1.5.15" } 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.
See the Issue Tracker documentation for more information.
Runtime Tracing Version 1.7
Version 1.7.0-rc01
September 18, 2024
androidx.compose.runtime:runtime-tracing:1.7.0-rc01
is released. Version 1.7.0-rc01 contains these commits.
Runtime Tracing Version 1.0
Version 1.0.0-beta01
November 29, 2023
androidx.compose.runtime:runtime-tracing:1.0.0-beta01
is released. Version 1.0.0-beta01 contains these commits.
Version 1.0.0-alpha05
November 15, 2023
androidx.compose.runtime:runtime-tracing:1.0.0-alpha05
is released. Version 1.0.0-alpha05 contains these commits.
Bug Fixes
- Pinned dependencies to lowest supported stable versions (i.e. compose-runtime and tracing-perfetto) - fixing an issue where compose-runtime-tracing would bring in a newer version of compose-runtime into the app.
Version 1.0.0-alpha04
August 23, 2023
androidx.compose.runtime:runtime-tracing:1.0.0-alpha04
is released. Version 1.0.0-alpha04 contains these commits.
New Features
- Compatible with latest versions of Benchmark and Tracing Perfetto, enabling support for Composition Tracing at app startup (cold start) e.g. in AndroidX Benchmark and Android Studio (starting from Hedgehog Beta 2).
API Changes
- Renamed
androidx.tracing.perfetto.Trace
toandroidx.tracing.perfetto.PerfettoSdkTrace
. (I44af8) - Making Tracing Perfetto SDK APIs consistent with
android.os.Trace
. (I73ba0, b/282199917) - Prerequisites for tracing at app startup. (Iad890)
- Merged experimental and public API files (I0f2e1, b/278769092)
Version 1.0.0-alpha02
February 8, 2023
androidx.compose.runtime:runtime-tracing:1.0.0-alpha02
is released. Version 1.0.0-alpha02 contains these commits.
New Features
- No functional changes. Multiple performance optimisations in downstream dependencies
androidx.tracing:tracing-perfetto*
.
Version 1.0.0-alpha01
September 7, 2022
androidx.compose.runtime:runtime-tracing:1.0.0-alpha01
is released. Version 1.0.0-alpha01 contains these commits.
New Features
androidx.compose.runtime:runtime-tracing
is a library which - in the presence of tooling supporting it (coming soon) - allows for extended tracing in a Compose app. This initial release is 1.0.0-alpha01.
Version 1.8
Version 1.8.0-alpha03
October 2, 2024
androidx.compose.runtime:runtime-*:1.8.0-alpha03
is released. Version 1.8.0-alpha03 contains these commits.
Performance Improvements
- Lazily create child context for
rememberCoroutineScope
(f61464)rememberCoroutineScope
is typically used to launch coroutines in response to events that happen post-composition. In some scenarios these events may never occur, leading to added costs of Job creation and cancellation without any benefit.- Make the scope returned by
rememberCoroutineScope
create itscoroutineContext
lazily when accessed, avoiding job creation and cancellation entirely if the scope is never used.
Version 1.8.0-alpha02
September 18, 2024
androidx.compose.runtime:runtime-*:1.8.0-alpha02
is released. Version 1.8.0-alpha02 contains these commits.
New Features
- Added
PausableComposition
which allows creating a subcomposition that can be paused during composition and and applied asynchronously to the composition. Compiler support is required for pausing which is currently in development. (I3394b)
Version 1.8.0-alpha01
September 4, 2024
androidx.compose.runtime:runtime-*:1.8.0-alpha01
is released. Version 1.8.0-alpha01 contains these commits.
Version 1.7
Version 1.7.3
October 2, 2024
androidx.compose.runtime:runtime-*:1.7.3
is released. Version 1.7.3 contains these commits.
Version 1.7.2
September 18, 2024
androidx.compose.runtime:runtime-*:1.7.2
is released. Version 1.7.2 contains these commits.
Version 1.7.1
September 10, 2024
- No changes to Android artifacts.
-desktop
artifacts were removed and-jvmStubs
and-linuxx64Stubs
artifacts were added. None of these targets are meant to be used, they are placeholders to help Jetbrains Compose efforts.
Version 1.7.0
September 4, 2024
androidx.compose.runtime:runtime-*:1.7.0
is released. Version 1.7.0 contains these commits.
Important changes since 1.6.0
- Added the ability to provide a composition local that is computed based on the values of other composition locals either by default, using
compositionLocalWithComputedDefault()
or by supplying a lambda to use to compute the value by usingprovidesComputed
instead ofprovides
. - The value of a composition local can be obtained by using the
currentValue
property of the composition local accessible from within the lambda computing the value. This is used instead ofcurrent
which is only accessible in@Composable
functions. (Iadbc0) - Newly created state objects are immediately accessible from other snapshots, including the global snapshot, with their initial state. Any subsequent modifications are not visible until the snapshot in which the object was created is applied.
- The initial state of
mutableStateOf()
, as well as their primitive versions, is the value passed in as a parameter tomutableStateOf()
. The initial state ofmutableStateListOf()
andmutableStateMapOf()
is empty. - Added
Snapshot.isInSnapshot
andSnapshot.PreexistingSnapshotId
that are used to enable a state object to support being immediately accessible from the global snapshot upon its creation. - Custom state objects can support being immediately accessible by following the pattern of changes made to the built-in snapshot objects. (I84a17)
- Enable
nonSkippingGroupOptimization
for compose libraries. This causes the generated code for all non-restartable composable functions in androidx to be more efficient. In the future we plan to enable this by default. I(acbc08) - Invalidate composable lambdas in subcompositions on the same frame. (98301c)
- Call
onRelease
callback in the same order asonForgotten
. (2cd790) - Enable strong skipping mode (ed1766)
- Make
currentCompoundHashKey
unique in more cases (d4a872)
Version 1.7.0-rc01
August 21, 2024
androidx.compose.runtime:runtime-*:1.7.0-rc01
is released. Version 1.7.0-rc01 contains these commits.
Version 1.7.0-beta07
August 7, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta07
is released. Version 1.7.0-beta07 contains these commits.
Version 1.7.0-beta06
July 24, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta06
is released. Version 1.7.0-beta06 contains these commits.
Version 1.7.0-beta05
July 10, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta05
is released. Version 1.7.0-beta05 contains these commits.
Version 1.7.0-beta04
June 26, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta04
is released. Version 1.7.0-beta04 contains these commits.
Version 1.7.0-beta03
June 12, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta03
is released. Version 1.7.0-beta03 contains these commits.
Version 1.7.0-beta02
May 29, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta02
is released. Version 1.7.0-beta02 contains these commits.
Version 1.7.0-beta01
May 14, 2024
androidx.compose.runtime:runtime-*:1.7.0-beta01
is released. Version 1.7.0-beta01 contains these commits.
Version 1.7.0-alpha08
May 1, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha08
is released. Version 1.7.0-alpha08 contains these commits.
Version 1.7.0-alpha07
April 17, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha07
is released. Version 1.7.0-alpha07 contains these commits.
New Features
- Added the ability to provide a composition local that is computed based on the values of other composition locals either by default, using
compositionLocalWithComputedDefault()
or by supplying a lambda to use to compute the value by usingprovidesComputed
instead ofprovides
. - The value of a composition local can be obtained by using the
currentValue
property of the composition local accessible from within the lambda computing the value. This is used instead ofcurrent
which is only accessible in@Composable
functions. (Iadbc0)
API Changes
- Newly created state objects are immediately accessible from other snapshots, including the global snapshot, with their initial state. Any subsequent modifications are not visible until the snapshot in which the object was created is applied.
- The initial state of
mutableStateOf()
, as well as their primitive versions, is the value passed in as a parameter tomutableStateOf()
. The initial state ofmutableStateListOf()
andmutableStateMapOf()
is empty. - Added
Snapshot.isInSnapshot
andSnapshot.PreexistingSnapshotId
that are used to enable a state object to support being immediately accessible from the global snapshot upon its creation. - Custom state objects can support being immediately accessible by following the pattern of changes made to the built-in snapshot objects. (I84a17)
Bug Fixes
- Fixed merging of
readObserver
in nested snapshots. This caused nested derived states to under-invalidate when used inside asnapshotFlow
. (Idf138)
Version 1.7.0-alpha06
April 3, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha06
is released. Version 1.7.0-alpha06 contains these commits.
Bug Fixes
- Fix provide single values handling
providesDefault
(538f45) - Avoid a deadlock in the Recomposer accessing the frame clock (07e5c6)
Version 1.7.0-alpha05
March 20, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha05
is released. Version 1.7.0-alpha05 contains these commits.
Bug Fixes
- Clear late changes on deactivated composition (5950bc)
Version 1.7.0-alpha04
March 6, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha04
is released. Version 1.7.0-alpha04 contains these commits.
Performance Improvements
- Call
Snapshot.current
once per derived state evaluation (ee7daf) - Read
currentRecord
once per observation in composition (b882b2) - Remove accidental iterator allocation in
snapshotFlow
(231e56) - Enable
nonSkippingGroupOptimization
for compose libraries. This causes the generated code for all non-restartable composable functions in androidx to be more efficient. In the future we plan to enable this by default. I(acbc08)
Version 1.7.0-alpha03
February 21, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha03
is released. Version 1.7.0-alpha03 contains these commits.
API Changes
- Introduce a replace groups to improve detecting changes (0941b5)
Performance Improvements
- Improve memory allocation when detecting changes (53e7fd)
- Fix a memory leak in the composer (0e097d)
- Use
ScopeMap
to pass invalidations when recomposing (e19a7e) - Optimize invalidations map to only keep derived states (f11c44)
- Replace
IdentityArraySet
usages withScatterSet
(db572e) - Optimize
removeScope
inScopeMap
(bb0530)
Version 1.7.0-alpha02
February 7, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha02
is released. Version 1.7.0-alpha02 contains these commits.
Bug Fixes
- Invalidate composable lambdas in subcompositions on the same frame. (98301c)
- Call
onRelease
callback in the same order asonForgotten
. (2cd790) - Filter changed states that are not observed in
snapshotFlow
. (796b80)
Performance Improvements
- Modify snapshot observer in place when it is already transparent. (f60f30)
- Optimize
SnapshotIdSet.lowest()
. (7ae149) - Use an allocation-free
fold()
inSnapshotIdSet
. (532b7d) - Remove iterator allocation (83f96b)
Version 1.7.0-alpha01
January 24, 2024
androidx.compose.runtime:runtime-*:1.7.0-alpha01
is released. Version 1.7.0-alpha01 contains these commits.
Performance Optimizations
- Add the ability to create slots after a child group has been added (b5960c)
- Optimize recording modifications of snapshot states (28c3fe)
- Enable strong skipping mode (ed1766)
Bug Fixes
- Account for default parameter meta in intrinsic remember (096665)
- Make
currentCompoundHashKey
unique in more cases (d4a872) - Realize groups when exiting inline function call (2a90fc)
Version 1.6
Version 1.6.8
June 12, 2024
androidx.compose.runtime:runtime-*:1.6.8
is released. Version 1.6.8 contains these commits.
Version 1.6.7
May 1, 2024
androidx.compose.runtime:runtime-*:1.6.7
is released. Version 1.6.7 contains these commits.
Version 1.6.6
April 17, 2024
androidx.compose.runtime:runtime-*:1.6.6
is released. No changes since the last release.
Version 1.6.5
April 3, 2024
androidx.compose.runtime:runtime-*:1.6.5
is released. Version 1.6.5 contains these commits.
Version 1.6.4
March 20, 2024
androidx.compose.runtime:runtime-*:1.6.4
is released. Version 1.6.4 contains these commits.
Version 1.6.3
March 6, 2024
androidx.compose.runtime:runtime-*:1.6.3
is released. Version 1.6.3 contains these commits.
Version 1.6.2
February 21, 2024
androidx.compose.runtime:runtime-*:1.6.2
is released. Version 1.6.2 contains these commits.
Version 1.6.1
February 7, 2024
androidx.compose.runtime:runtime-*:1.6.1
is released. Version 1.6.1 contains these commits.
Bug Fixes
- Call
onRelease
callback in the same order asonForgotten
. (2cd790) - Filter changed states that are not observed in
snapshotFlow
. (796b80)
Version 1.6.0
January 24, 2024
androidx.compose.runtime:runtime-*:1.6.0
is released. Version 1.6.0 contains these commits.
Important changes since 1.5.0
New Features
- Re-throw exceptions that are swallowed during recomposition loop (4dff9a)
Performance Optimizations
- Optimize recording modifications of snapshot states (28c3fe)
- Optimize
rememberSaveable
(f01d79) - Defer re-reading derived states until changes are recorded (f38099)
- Improve providing composition local values (a337ea)
Bug Fixes
- Fix slot table memory leak (73fcfe)
- Skip recomposition of subcompositions that will be removed. (Ieeb99, b/254645321)
- Only trigger
RememberObserver
lifecycles when it is stored in remember calculation. (f6b4dc) - Restrict
$dirty
capture to inline lambdas. (acfca0) - Fix moveable content sometimes receiving the wrong composition locals. (035cd6)
Version 1.6.0-rc01
January 10, 2024
androidx.compose.runtime:runtime-*:1.6.0-rc01
is released. Version 1.6.0-rc01 contains these commits.
Version 1.6.0-beta03
December 13, 2023
androidx.compose.runtime:runtime-*:1.6.0-beta03
is released. Version 1.6.0-beta03 contains these commits.
Version 1.6.0-beta02
November 29, 2023
androidx.compose.runtime:runtime-*:1.6.0-beta02
is released. Version 1.6.0-beta02 contains these commits.
Version 1.6.0-beta01
November 15, 2023
androidx.compose.runtime:runtime-*:1.6.0-beta01
is released. Version 1.6.0-beta01 contains these commits.
API Changes
- Propagate Certain stability values in annotation. (274a4c)
Bug Fixes
- Use referential policy for composition local scope state in context. (83361c)
- Restrict $dirty capture to inline lambdas. (acfca0)
- Fix moveable content sometimes receiving the wrong composition locals. (035cd6)
- Use faster non-allocating hashmaps in
RecomposeScopeImpl
. (d79494) - Use
ObjectIntMap
inDerivedState
. (21862e) - Use
IntRef
for intSnapshotThreadLocal
inDerivedState
. (04eaf4)
Version 1.6.0-alpha08
October 18, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha08
is released. Version 1.6.0-alpha08 contains these commits.
Bug Fixes
- Only trigger
RememberObserver
lifecycles when it is stored in remember calculation. (f6b4dc) - Improve allocations in invalidations list sorting. (954d63)
- Use new non-allocating maps in
SnapshotStateObserver
. (4303ce) - Clear invalidations when composition is deactivated. (e001be)
Version 1.6.0-alpha07
October 4, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha07
is released. Version 1.6.0-alpha07 contains these commits.
API Changes
SnapshotStateList
is now marked asRandomAccess
to enable the direct indexing version of list helpers to be used. (I5210c, b/219554654)
Version 1.6.0-alpha06
September 20, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha06
is released. Version 1.6.0-alpha06 contains these commits.
Version 1.6.0-alpha05
September 6, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha05
is released. Version 1.6.0-alpha05 contains these commits.
Version 1.6.0-alpha04
August 23, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha04
is released. Version 1.6.0-alpha04 contains these commits.
New Features
- Re-throw exceptions that are swallowed during recomposition loop (4dff9a)
API Changes
- Added a method to deactivate
ReusableComposition
, removing observations but keeping nodes in place. The deactivated composition can be activated again by callingsetContent
. (Ib7f31) - Add
ReusableComposition
interface for managing lifecycle and reuse of subcompositions. (I812d1, b/252846775)
Version 1.6.0-alpha03
August 9, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha03
is released. Version 1.6.0-alpha03 contains these commits.
Bug Fixes
- Fix new
CompositionLocalProvider
optimization (3118e88) - Correct how movable content nodes are disassembled. (5e3d59b)
Version 1.6.0-alpha02
July 26, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha02
is released. Version 1.6.0-alpha02 contains these commits.
New Features & Performance Enhancements
- Optimize
rememberSaveable
(f01d79) - Defer re-reading derived states until changes are recorded (f38099)
- Improve providing composition local values (a337ea)
SideEffect
is marked as@ExplicitGroupsComposable
to avoid generating a group. (I74815)- Avoid comparing composition local maps on reuse (782071)
API Changes
- Added a special case overload for
CompositionLocalProviders
that avoids overhead used to make providing multiple values faster but is overhead when providing a single value. (I6d640, b/288169379)
Bug Fixes
- Fix slot table memory leak (73fcfe)
- Fix how we restore
rememberSaveable
whenstateSaver
returns null (90748c)
Version 1.6.0-alpha01
June 21, 2023
androidx.compose.runtime:runtime-*:1.6.0-alpha01
is released. Version 1.6.0-alpha01 contains these commits.
Bug Fixes
- Skip recomposition of subcompositions that will be removed. (Ieeb99, b/254645321)
- Reduced allocations when applying snapshots. (I65c09)
- Avoid calculating
readableHash
inDerivedState
if snapshot wasn't modified (68c565)
Version 1.5
Version 1.5.4
October 18, 2023
androidx.compose.runtime:runtime-*:1.5.4
is released. Version 1.5.4 contains these commits.
Version 1.5.3
October 4, 2023
androidx.compose.runtime:runtime-*:1.5.3
is released. Version 1.5.3 contains these commits.
Version 1.5.2
September 27, 2023
androidx.compose.runtime:runtime-*:1.5.2
is released. Version 1.5.2 contains these commits.
Version 1.5.1
September 6, 2023
androidx.compose.runtime:runtime-*:1.5.1
is released. Version 1.5.1 contains these commits.
Version 1.5.0
August 9, 2023
androidx.compose.runtime:runtime-*:1.5.0
is released. Version 1.5.0 contains these commits.
API Changes
- Removed allocations in recomposition, color animations, and
AndroidComposeView
. (Ib2bfa) - Added a
@StateFactoryMarker
annotation, to mark functions that create states and must be wrapped in aremember
call. (I64550) - Add primitive versions of State and
MutableState
(fb3d89) - Added
Snapshot.isApplyObserverNotificationPending
(I672a5) - Added primitive versions of the
State
API, allowing Int, Long, Float, and Double values to be tracked inState
objects without incurring penalties for autoboxing. Use the new factory methodsmutableIntState(Int)
,mutableFloatStateOf(Float)
, etc in order to use these. (I48e43)
Bug Fixes
- Skip recomposition of subcompositions that will be removed. (Ieeb99, b/254645321)
- Don't retain snapshot reference in
ComposerImpl
(0206f7) - Don’t apply composition twice (f5791b)
- Ensure invalidation for non-initialized derived state values (aa2a92)
- Call
onEndChanges
during composition dispose. (62cc8c) - Fix moving content into a sub-composition (4beb41)
- Fix potential deadlocks (c1a425 and 8edce0)
- The recomposer created for an Android window will now only block calls to
withFrameNanos
instead of all composition when it receives an ON_STOP notification. This means windows associated with stopped activites will continue to recompose for data changes but the animations, or any other caller ofwithFrameNanos
, will block. (Id9e7f, b/240975572) - Execute deactivation callbacks for
LayoutNode
before disposing effects 3784073 - Fix changed flags for restarted lambdas ea81df9
- Fix live edit regression for Composable with nodes 73fd4d8
- ON_STOP should pause the frame clock broadcasts instead of composition ae276f1
- Invalidate
SnapshotStateObserver
scopes for unchanged derived states 84d9b1c - Fix potential dead-lock when disposing compositions 28761fc
- Fix moving content into a sub-composition 92d4156
- Fix changed flags for restarted lambdas (8a03e9)
- Execute deactivation callbacks for
LayoutNode
before disposing effects (8b0fa4) - Fix
endToMarker()
when ending node groups. (d71d980) - Use current
SlotWriter
group for check on deactivation (a0b518b) - Remove the
fill
inSlotTable.moveSlotGapTo()
and move it to close (81f9935) - Fix missing invalidations while movable content is moving (1d7c024)
- Fix immediate invalidations for moved movable content (8676618)
Performance Improvements
- Avoid calculating
readableHash
inDerivedState
if snapshot wasn't modified. (307102) - Reduced allocations (I65c09, d7ea77, 727974, and 445808 )
- Quick cancellation of compose
CoroutineScopes
(a55362 and bd382f) - Overwrite records of state objects with inaccessible state records (c986960)
- Use composer of the correct scope when realizing groups (9a5e5b6)
- Use
IdentityArraySet
to store snapshot invalidations (7f60cca) - Reduce allocations for snapshot observations (5bc535f)
Version 1.5.0-rc01
July 26, 2023
androidx.compose.runtime:runtime-*:1.5.0-rc01
is released. Version 1.5.0-rc01 contains these commits.
Bug Fixes
Defer re-reading derived states until changes are recorded (f38099)
An optional inspection to recommend migrating
mutableStateOf()
calls to their corresponding specialized types for primitives is available. Its lint ID isAutoboxingStateCreation
. Previously, this inspection was enabled by default for all projects. To see this warning in Android Studio's editor and your project's lint outputs, change its severity from informational to warning (or higher) by declaringwarning "AutoboxingStateCreation"
inside your module's build.gradle or build.gradle.kts configuration as shown (I34f7e):android { lint { warning "AutoboxingStateCreation" } ... }
Version 1.5.0-beta03
June 28, 2023
androidx.compose.runtime:runtime-*:1.5.0-beta03
is released. Version 1.5.0-beta03 contains these commits.
Bug Fixes
- Skip recomposition of subcompositions that will be removed. (Ieeb99, b/254645321)
Version 1.5.0-beta02
June 7, 2023
androidx.compose.runtime:runtime-*:1.5.0-beta02
is released. Version 1.5.0-beta02 contains these commits.
Performance Improvements
- Avoid calculating
readableHash
inDerivedState
if snapshot wasn't modified. (307102)
Version 1.5.0-beta01
May 24, 2023
androidx.compose.runtime:runtime-*:1.5.0-beta01
is released. Version 1.5.0-beta01 contains these commits.
API Changes
- Removed allocations in recomposition, color animations, and
AndroidComposeView
(Ib2bfa) - Added a
@StateFactoryMarker
annotation, to mark functions that create states and must be wrapped in aremember
call. (I64550) - Add primitive versions of State and
MutableState
(fb3d89) - Added
Snapshot.isApplyObserverNotificationPending
(I672a5)
Bug Fixes
- Reduced allocations (I65c09, d7ea77, 727974, and 445808 )
- Don't retain snapshot reference in
ComposerImpl
(0206f7) - Quick cancellation of compose
CoroutineScopes
(a55362 and bd382f) - Don’t apply composition twice (f5791b)
- Ensure invalidation for non-initialized derived state values (aa2a92)
- Call
onEndChanges
during composition dispose. (62cc8c) - Fix moving content into a sub-composition (4beb41)
- Fix potential deadlocks (c1a425
- ON_STOP should pause the frame clock broadcasts instead of composition (f4a2d1)
- Fix changed flags for restarted lambdas (8a03e9)
- Execute deactivation callbacks for
LayoutNode
before disposing effects (8b0fa4)
External Contribution
- Added
Snapshot.isApplyObserverNotificationPending
(I672a5)
Version 1.5.0-alpha04
May 10, 2023
androidx.compose.runtime:runtime-*:1.5.0-alpha04
is released. Version 1.5.0-alpha04 contains these commits.
API Changes
- Added primitive versions of the
State
API, allowing Int, Long, Float, and Double values to be tracked inState
objects without incurring penalties for autoboxing. Use the new factory methodsmutableIntState(Int)
,mutableFloatStateOf(Float)
, etc in order to use these. (I48e43)
Bug Fixes
Call
onEndChanges
during composition dispose. Focus nodes removed duringComposition.dispose
are subscribing toonEndChanges
to reset focus.(03d4a47)Ensure invalidation for non-initialized derived state values. Each derived state is associated with a list of its dependencies in
SnapshotStateObserver
, used to invalidate scopes associated with derived state whenever dependency changes. The dependency change is registered on snapshot advance, which can happen after derived state read (due to the call toSnapshot.notifyObjectsInitialized()
).Previous derived state observation logic in
SnapshotStateObserver
was cleaning up old dependencies, then reading new value. This resulted in a race condition with invalidation happening in a cleaned up state, where dependency invalidation wasn't registered.This change reorders derived state read and dependency cleanup, ensuring that invalidation always happens in a valid state. (c472be6)
Version 1.5.0-alpha03
April 19, 2023
androidx.compose.runtime:runtime-*:1.5.0-alpha03
is released. Version 1.5.0-alpha03 contains these commits.
API Changes
- The recomposer created for an Android window will now only block calls to
withFrameNanos
instead of all composition when it receives an ON_STOP notification. This means windows associated with stopped activites will continue to recompose for data changes but the animations, or any other caller ofwithFrameNanos
, will block. (Id9e7f, b/240975572)
Bug Fixes
- Fix potential deadlock in snapshot list and map 5c1a425
- Execute deactivation callbacks for
LayoutNode
before disposing effects 3784073 - Fix changed flags for restarted lambdas ea81df9
- Fix live edit regression for Composable with nodes 73fd4d8
- ON_STOP should pause the frame clock broadcasts instead of composition ae276f1
- Invalidate
SnapshotStateObserver
scopes for unchanged derived states 84d9b1c - Fix potential dead-lock when disposing compositions 28761fc
- Fix moving content into a sub-composition 92d4156
Version 1.5.0-alpha02
April 5, 2023
androidx.compose.runtime:runtime-*:1.5.0-alpha02
is released. Version 1.5.0-alpha02 contains these commits.
New Features
- Kotlin’s
getValue
operator can now be composable (f174f6e)
Bug Fixes, Performance Improvements
- Overwrite records of state objects with inaccessible state records (c986960)
- Use composer of the correct scope when realizing groups (9a5e5b6)
- Fix
endToMarker()
when ending node groups. (d71d980) - Use current
SlotWriter
group for check on deactivation (a0b518b) - Use
IdentityArraySet
to store snapshot invalidations (7f60cca) - Remove the
fill
inSlotTable.moveSlotGapTo()
and move it to close (81f9935) - Fix missing invalidations while movable content is moving (1d7c024)
- Fix immediate invalidations for moved movable content (8676618)
- Reduce allocations for snapshot observations (5bc535f)
Version 1.5.0-alpha01
March 22, 2023
androidx.compose.runtime:runtime-*:1.5.0-alpha01
is released. Version 1.5.0-alpha01 contains these commits.
New Features
- Adds
Modifier.Node#coroutineScope
to allowModifier.Nodes
to launch coroutines (I76ef9) - Allow
Modifier.Nodes
to readCompositionLocals
by implementing theCompositionLocalConsumerModifierNode
interface. (Ib44df)
Version 1.4
Version 1.4.3
May 3, 2023
androidx.compose.runtime:runtime-*:1.4.3
is released with no changes.
Version 1.4.2
April 19, 2023
androidx.compose.runtime:runtime-*:1.4.2
is released. Version 1.4.2 contains these commits.
Bug Fixes
Fix potential deadlock in snapshot list and map 2eb6570
Adding content to a
SnapshotStateList
orSnapshotStateMap
can encounter a deadlock if the modification is concurrent with a direct write to the state record. This was made significantly more likely to be encountered with the changes introduced by 93fcae828b that uses direct writes to release unused records.The locks are now ordered in that a snapshot lock is never attempted to be taken when a map or list lock is held.
Version 1.4.1
April 5, 2023
androidx.compose.runtime:runtime-*:1.4.1
is released. Version 1.4.1 contains these commits.
Bug Fixes
- Fix
endToMarker()
when ending node groups. d71d980
Version 1.4.0
March 22, 2023
androidx.compose.runtime:runtime-*:1.4.0
is released. Version 1.4.0 contains these commits.
Important changes since 1.3.0
- Use initialized value from
LiveData
for first composition 3680e25 - Add
ComposeNodeLifecycleCallback
to observe lifecycle of compose nodes. 8b6a258 - Add
parameterTypes
property toComposableMethod
7b6c7ad
Bug Fixes & Performance Improvements
- Clear both scope indexes in
SnapshotStateObserver
29f4a3e - Add groups needed in the body of unskippable lambdas 7d06752
- Improve memory reference characteristics of Snapshot state 93fcae8
- Remove boxing in composition local lookups 0875717
- Use correct key for non-reusable nodes groups 6388d8d
- Protect
SnapshotStateObserver
from recursive and concurrent applies 98cb6ba - Added a check-index-bounds check in the
IdentityArraySet
"get" method 35a77d3 - Update compose module to use
ViewTreeLifecycleOwner
extensions 21c2122 - Send apply notifications after Recomposer finishes frame. 98f2641
- Fix index out of bounds crash when cancelling the Recomposer 8f8656f
- Always force recompose if parent providers of Composition have changed 9526fcc
- Recomposer tolerance for cancelled Jobs a55f7ed
- Improve handling invalidations for large number of composers 9b7ed67
- Fix generating closing groups for non-local returns b6f590c
Version 1.4.0-rc01
March 8, 2023
androidx.compose.runtime:runtime-*:1.4.0-rc01
is released. Version 1.4.0-rc01 contains these commits.
Bug Fixes
Version 1.4.0-beta02
February 22, 2023
androidx.compose.runtime:runtime:1.4.0-beta02
and androidx.compose.runtime:runtime-saveable:1.4.0-beta02
are released. Version 1.4.0-beta02 contains these commits.
Version 1.4.0-beta01
February 8, 2023
androidx.compose.runtime:runtime-*:1.4.0-beta01
is released. Version 1.4.0-beta01 contains these commits.
API Changes
ComposeNodeLifecycleCallback
was added which allows to observe lifecycle of Compose nodes (I3731b)- Added
@TestOnly
toComposer.disableSourceInformation()
as this function is only safe to call in a test. (I896c8)
Bug Fixes
- Remove boxing in composition local lookups (62f66a)
- Improve memory reference characteristics of Snapshot state (dfb451)
Version 1.4.0-alpha05
January 25, 2023
androidx.compose.runtime:runtime:1.4.0-alpha05
and androidx.compose.runtime:runtime-saveable:1.4.0-alpha05
are released. Version 1.4.0-alpha05 contains these commits.
API Changes
- More type/nullability of inline/deprecated-hidden functions (I24f91)
Version 1.4.0-alpha04
January 11, 2023
androidx.compose.runtime:runtime-*:1.4.0-alpha04
is released. Version 1.4.0-alpha04 contains these commits.
API Changes
TestMonotonicFrameClock
now uses correct experimental annotation. (I95c9e)
Bug Fixes
- Protect
SnapshotStateObserver
from recursive and concurrent applies (d902fb)
Version 1.4.0-alpha03
December 7, 2022
androidx.compose.runtime:runtime-*:1.4.0-alpha03
is released. Version 1.4.0-alpha03 contains these commits.
API Changes
- adding a new public method to
ComposableMethod
class analogous tojava.lang.reflect.Method#getParameterTypes()
(Iab0c3)
Bug Fixes
- Snapshot apply notifications are now sent after the
Recomposer
finishes applying changes. (Iad6c0, b/222093277)
Version 1.4.0-alpha02
November 9, 2022
androidx.compose.runtime:runtime-*:1.4.0-alpha02
is released. Version 1.4.0-alpha02 contains these commits.
Version 1.4.0-alpha01
October 24, 2022
androidx.compose.runtime:runtime-*:1.4.0-alpha01
is released. Version 1.4.0-alpha01 contains these commits.
API Changes
SnapshotStateList
andSnapshotStateMap
now have explicit implementaions oftoList()
andtoMap()
, respectfully. These methods return their current content without peforming a copy as they return the internal immutable data used to store their content. This value can be used, for example, to produce a flow of values usingsnapshotFlow
without requiring copying of the data. (Ica2bd)
Version 1.3
Version 1.3.3
January 11, 2023
androidx.compose.runtime:runtime-*:1.3.3
is released. Version 1.3.3 contains these commits.
- No changes since 1.3.2
Version 1.3.2
December 7, 2022
androidx.compose.runtime:runtime-*:1.3.2
is released. Version 1.3.2 contains these commits.
Bug Fixes
- Updated to support androidx.compose.ui 1.3.2
Version 1.3.1
November 9, 2022
androidx.compose.runtime:runtime-*:1.3.1
is released. Version 1.3.1 contains these commits.
Version 1.3.0
October 24, 2022
androidx.compose.runtime:runtime-*:1.3.0
is released. Version 1.3.0 contains these commits.
Important changes since 1.2.0
Exception Handling / Live Edit Support
- In order to better support live edit, APIs were added to enable handling of exceptions during composition
- Composition error handling for hot reload
- Handle live edit errors on save/restore
Composition Tracing
- Runtime tracing APIs were added in order to support new composition tracing tooling
- Generate composable trace event start/end calls
- Re-added ComposerKt.traceEventStart(Int, String)
Composable Reflection APIs
- A new
ComposableMethod
API was added to allow for more reliable reflection-based invocations of composable APIs. - Move invokeComposable to compose runtime
- Rework API to invoke composable method
Runtime Fixes
- Fix faulty range test for slot table checking for markers
- Allow movable content to move into and out of SubcomposeLayout
- Fix moving content to new content of a subcomposition
Snapshot System
- The snapshot system got various improvements around memory management, performance, and correctness.
- Optimize scope removal in SnapshotStateObserver
- Dispose nested snapshots created from transparent snapshots
- Fixed race condition when reading state from the global snapshot
- Support DerivedState in SnapshotStateObserver
- Prevent removing derived state from composition when it is read in other scopes
- Use IdentityArrayMap instead of HashMap inside DerivedState
- Update derived state observers to use mutable vector
- Update SnapshotStateObserver state cleanup
- Replace SnapshotStateObserver.invalidated with ArraySet
- Fixed race condition when reading state from the global snapshot
- Fix use of stale record in DerivedState hash calculation
- Fix race condition when advancing the global snapshot
- Speed up scope observations cleanup in SnapshotStateObserver
Version 1.3.0-rc01
October 5, 2022
androidx.compose.runtime:runtime-*:1.3.0-rc01
is released. Version 1.3.0-rc01 contains these commits.
Bug Fixes
- Fixed
ArrayIndexOutOfBoundsException
coming from the slot table (b/249076084)
Version 1.3.0-beta03
September 21, 2022
androidx.compose.runtime:runtime-*:1.3.0-beta03
is released. Version 1.3.0-beta03 contains these commits.
Behavior Breaking Change
- The parameter to
remember
andrememberCoroutineScope
where changed to becrossinline
. This will report an error for early returns instead of allowing an early return which will cause a later internal error to be reported. - This change can potentially lead to new compiler errors to be reported requiring non-local returns to be removed from the lambdas passed to these functions. (Ibea62)
Version 1.3.0-beta02
September 7, 2022
androidx.compose.runtime:runtime-*:1.3.0-beta02
is released. Version 1.3.0-beta02 contains these commits.
Bug Fixes
- Updated API (I64ca0)
Version 1.3.0-beta01
August 24, 2022
androidx.compose.runtime:runtime-*:1.3.0-beta01
is released. Version 1.3.0-beta01 contains these commits.
API Changes
- A
find
method was added toCompositionData
to allow developer tools using this API to quickly find a sub-group of composition using its identity. (I5794f)
Version 1.3.0-alpha03
August 10, 2022
androidx.compose.runtime:runtime-*:1.3.0-alpha03
is released. Version 1.3.0-alpha03 contains these commits.
Version 1.3.0-alpha02
July 27, 2022
androidx.compose.runtime:runtime-*:1.3.0-alpha02
is released. Version 1.3.0-alpha02 contains these commits.
API Changes
- Re-added
ComposerKt.traceEventStart(Int, String)
for backwards compatibility (I6e6de)
Version 1.3.0-alpha01
June 29, 2022
androidx.compose.runtime:runtime-*:1.3.0-alpha01
is released. Version 1.3.0-alpha01 contains these commits.
API Changes
- Moving utility functionality to runtime (I4f729)
Version 1.2
Version 1.2.1
August 10, 2022
androidx.compose.runtime:runtime-*:1.2.1
is released. Version 1.2.1 contains these commits.
Bug Fixes
- Fixed memory leak: dispose of nested snapshots created from transparent snapshots b/239603305
Version 1.2.0
July 27, 2022
androidx.compose.runtime:runtime-*:1.2.0
is released. Version 1.2.0 contains these commits.
Important changes since 1.1.0
Compose Runtime had a handful of features introduced in 1.2.0, along with many stabilizing bug fixes. The most significant new feature was the introduction of the
movableContentOf
API, which can be used to enable complex UX such as shared element transitions. ThemovableContentOf
API converts a composable lambda into a lambda that moves it state, and corresponding nodes, to any new location it is called. When the previous call leaves the composition the state is temporarily preserved and if a new call to the lambda enters the composition then the state, and associated Nodes, are moved to the location of the new call. If no new call is added the state is removed permanently and remember observers are notified.If a
movableContentOf
lambda is called multiple times in the same composition, new state and nodes are created for each call and, as calls leave the composition and new calls enter, the state is moved from the first leaving calls to the entering calls in the order they are called. All state not claimed by new calls is removed permanently.In addition to this and a few other new features, much time was spent stabilizing the runtime and Snapshot state system. Various memory leaks were removed and code paths optimized.
A summarized list of the changes can be found below:
New Features in 1.2
- Add experimental snapshot unsafeEnter/Leave
- Add Snapshot.asContextElement experimental API
- Introduce Snapshot.withoutReadObservation
- Allow state to move within a composition
- Tracing of Recompositions in Compose
Performance in 1.2
- Improve composition local performance
- Baseline profiles for compose should be derived using benchmarks
Bug Fixes in 1.2
- Remove tracking information from release recompose scopes
- Prevent removing derived state from composition when it is read in other scopes
- Use more efficient removeScope() in SnapshotStateObserver
- Clean up derived state dependencies in composition
- Fix currentCompositeKeyHash changing after inner recomposition inside movable content
- Clean up invalidated compositions during disposal
- Fix derive state read during recomposition
- Fix memory leak when observing derived state objects
- Fixed movableContent composite hash key to be consistent
- Fix corner a case where the composer would crash
- Ensure forced invalidation of a group forces recomposition
- Fix bug when rememberSaveable with input is restored in the wrong order
Version 1.2.0-rc03
June 29, 2022
androidx.compose.runtime:runtime-*:1.2.0-rc03
is released. Version 1.2.0-rc03 contains these commits.
Bug Fixes
- Derived state observations were previously unconditionally removed from the recompose scope and composition together, which broke other scopes which might be still observing derived state. This change only removes derived state instances if it is no longer observed by other scopes. (b/236618362)
Version 1.2.0-rc02
June 22, 2022
androidx.compose.runtime:runtime-*:1.2.0-rc02
is released. Version 1.2.0-rc02 contains these commits.
Version 1.2.0-rc01
June 15, 2022
androidx.compose.runtime:runtime-*:1.2.0-rc01
is 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.runtime:runtime-*:1.2.0-beta03
is released. Version 1.2.0-beta03 contains these commits.
Version 1.2.0-beta02
May 18, 2022
androidx.compose.runtime:runtime-*:1.2.0-beta02
is released. Version 1.2.0-beta02 contains these commits.
Version 1.2.0-beta01
May 11, 2022
androidx.compose.runtime:runtime-*:1.2.0-beta01
is released. Version 1.2.0-beta01 contains these commits.
New Features
- This is the first beta release of 1.2!
API Changes
- Added experimental
Snapshot.unsafeEnter/unsafeLeave
(I108f3) - Added experimental
Snapshot.asContextElement()
API (Iff072) - The
@ComposableTarget
annotation and annotations marked by@ComposableTargetMarker
can now be used at the file scope using the@file
prefix. Using a target annotation at the file scope will cause the compiler to assume all composable functions in the file are intended to be target the associated applier. For example, using@file:UiComposable
declares that all@Composable
functions target the Compose UI applier. A function that needs to target another applier must explicitly supply the target marker annotation for the desired applier. (I40804)
Version 1.2.0-alpha08
April 20, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha08
is released. Version 1.2.0-alpha08 contains these commits.
API Changes
- Added
TracingInProgress
to theCompositionTracer
interface. (Ic6f12) - Add
recomposeScopeIdentity
to Composer (I0c873) - Restricted tracing APIs (Composer.setTracer) to
OptIn(InternalComposeTracingApi)
. (I9187f) - Added
ResuableContentHost
which allows better control over the lifetime of state created for reusable content. For example, if a sub-composition is temporarily not in use then the content can be deactivated causing all the remembered state in the composition to be forgotten triggering, for example, all disposable effects. (I2c0f2, b/220322704)
Version 1.2.0-alpha07
April 6, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha07
is released. Version 1.2.0-alpha07 contains these commits.
API Changes
- New function
Snapshot.withoutReadObservation { ... }
was added. It allows users to run the passed lambda without subscribing to the changes of the state values read during this block. You could find it useful in use cases when you want to benefit from the snapshot based thread safe write/reads, but want to be able to read the value without causing unnecessary recomposition or remeasure. (I9f365, b/214054486)
Version 1.2.0-alpha06
March 23, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha06
is released. Version 1.2.0-alpha06 contains these commits.
Version 1.2.0-alpha05
March 9, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha05
is released. Version 1.2.0-alpha05 contains these commits.
External Contribution
- Updated to use Kotlinx coroutines 1.6.0 (I3366d)
Version 1.2.0-alpha04
February 23, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha04
is released. Version 1.2.0-alpha04 contains these commits.
API Changes
Added
ComposableTarget
,ComposableTargetMarker
andComposableOpenTarget
that allows compile time reporting of when a composable function is called targeting an applier it was not designed to use.In most cases the annotations can be inferred by the compose compiler plugin so using these annotation directly should be rare . The cases that cannot be inferred include creating and using a custom applier, abstract composable functions (such as interface methods), fields or global variables that are composable lambdas (local variables and parameters are inferred), or when using
ComposeNode
or a related composable functions.For custom appliers the composable functions that calls
ComposeNode
orReusableComposeNode
need to add aCompoableTarget
annotation for the function and any composable lambda parameter types. It is recommended, however, to create an annotation that is annotated withComposableTargetMarker
and then the marked annotation be used instead ofComposableTarget
directly. A composable annotation marked withComposableTargetMarker
is equivalent to aComposbleTarget
with the fully qualified name of the attribute class as the applier parameter. For an example of usingComposableTargetMarker
seeanroidx.compose.ui.UiComposable
. (I38f11)
Version 1.2.0-alpha03
February 9, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha03
is released. Version 1.2.0-alpha03 contains these commits.
API Changes
Added
movableContentOf
which converts a composable lambda into a lambda that moves it state, and corresponding nodes, to any new location it is called. When the previous call leaves the composition the state is temporarily preserved and if a new call to the lambda enters the composition then the state, and associated nodes, are moved to the location of the new call. If no new call is added the state is removed permanently and remember observers are notified.If a
movableContentOf
lambda is called multiple times in the same composition, new state and nodes are created for each call and, as calls leave the composition and new calls enter, the state is moved from the first leaving calls to the entering calls in the order they are called. All state not claimed by new calls is removed permanently. (Ib4850)Added a tracing API to composition to enable tools to provide more detailed tracing of composable functions. The compiler now generates calls to the tracing API which include source information. (Ib0eb5)
To remove these calls and the associated source information from a release build, add the following Proguard rule:
-assumenosideeffects public class androidx.compose.runtime.ComposerKt { boolean isTraceInProgress(); void traceEventStart(int,java.lang.String); void traceEventEnd(); }
Add
InternalComposeScope
which gives tools the ability to identify a composable during recompositions. (I07a3f)
Version 1.2.0-alpha02
January 26, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha02
is released. Version 1.2.0-alpha02 contains these commits.
Version 1.2.0-alpha01
January 12, 2022
androidx.compose.runtime:runtime-*:1.2.0-alpha01
is released. Version 1.2.0-alpha01 contains these commits.
API Changes
- Added
identity
field toCompositionData
for generating invariant ids in the Layout Inspector. (Ic116e)
Dependency Updates
- Now depends on Kotlin
1.6.10
.
Version 1.1
Version 1.1.1
February 23, 2022
androidx.compose.runtime:runtime-*:1.1.1
is released. Version 1.1.1 contains these commits.
Bug Fixes
- Fix
NullPointerException
atandroidx.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.runtime:runtime-*:1.1.0
is 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.runtime:runtime-*:1.1.0-rc03
is 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.runtime:runtime-*:1.1.0-rc01
is released. Version 1.1.0-rc01 contains these commits.
Version 1.1.0-beta04
December 1, 2021
androidx.compose.runtime:runtime-*:1.1.0-beta04
is 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.runtime:runtime-*:1.1.0-beta03
is released. Version 1.1.0-beta03 contains these commits.
Version 1.1.0-beta02
November 3, 2021
androidx.compose.runtime:runtime-*:1.1.0-beta02
is released. Version 1.1.0-beta02 contains these commits.
API Changes
- Snapshot code was split up into multiple files, but all still lives in the same JVM class. (Ic6c98)
Version 1.1.0-beta01
October 27, 2021
androidx.compose.runtime:runtime-*:1.1.0-beta01
is released. Version 1.1.0-beta01 contains these commits.
Version 1.1.0-alpha06
October 13, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha06
is released. Version 1.1.0-alpha06 contains these commits.
API Changes
- Removed
InternalCompilerApi
from Composer methods that are required to be called cross-module (I1aa0b) Recomposer.state
has been deprecated and replaced byRecomposer.currentState
to change its type to a StateFlow (Ic2ab3, b/197773820)
Version 1.1.0-alpha05
September 29, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha05
is released. Version 1.1.0-alpha05 contains these commits.
Version 1.1.0-alpha04
September 15, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha04
is released. Version 1.1.0-alpha04 contains these commits.
Version 1.1.0-alpha03
September 1, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha03
is released. Version 1.1.0-alpha03 contains these commits.
New Features
- The Compose Compiler now supports older versions of the Compose Runtime (1.0). Prior to this change, the Compose Compiler was only compatible with the Compose Runtime of the same version or later. After this change, the Compose Compiler is compatible with an older version of the Compose Runtime (1.0). (aosp/1796968)
- Updated Compose
1.1.0-alpha03
to depend on Kotlin1.5.30
. (I74545)
Version 1.1.0-alpha02
August 18, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha02
is released. Version 1.1.0-alpha02 contains these commits.
Version 1.1.0-alpha01
August 4, 2021
androidx.compose.runtime:runtime-*:1.1.0-alpha01
is released. Version 1.1.0-alpha01 contains these commits.
Version 1.0
Version 1.0.5
November 3, 2021
androidx.compose.runtime:runtime-*:1.0.5
is 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.runtime:runtime-*:1.0.4
is 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.runtime:runtime-*:1.0.3
is 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.runtime:runtime-*:1.0.2
is 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.runtime:runtime-*:1.0.1
is 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.runtime:runtime-*:1.0.0
is 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 AGP7.1
. (b/194289155)
Version 1.0.0-rc02
July 14, 2021
androidx.compose.runtime:runtime-*:1.0.0-rc02
is released. Version 1.0.0-rc02 contains these commits.
- Fixed race conditions in SnapshotStateObserver causing spurratic NullPointerExceptions. (aosp/1763445, aosp/1758105, b/192677711)
- Fixed issues with runtime snapshots causing
java.lang.IllegalStateException: Reading a state that was created after the snapshot was taken or in a snapshot that has not yet been applied
crashes. (b/193006595, b/192570897)
Version 1.0.0-rc01
July 1, 2021
androidx.compose.runtime:runtime-*:1.0.0-rc01
is released. Version 1.0.0-rc01 contains these commits.
Version 1.0.0-beta09
June 16, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta09
is released. Version 1.0.0-beta09 contains these commits.
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 thesrc/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 usingadb 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 charactersH
,S
, andP
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 classandroidx.compose.runtime.SlotTable
would have a descriptor ofLandroidx/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 methodfun isPlaced(): Boolean
onLayoutNode
has the signatureisPlaced()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.runtime:runtime-*:1.0.0-beta08
is released. Version 1.0.0-beta08 contains these commits.
API Changes
State<T>
is nowState<out T>
(I69049)ControlledComposition
API change to enable recomposing changes in a recompose single pass. (Iaafd1, b/184173932)
Version 1.0.0-beta07
May 18, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta07
is released. Version 1.0.0-beta07 contains these commits.
API Changes
- Added new compose compiler APIs that allow the source information generated by the compiler to be removed during source minification. (Ia34e6)
Introduces
ReusableContent
which will attempt to reuse the nodes in its content instead of replacing them when the key is changed. When the key is changed the previous values in the slot table for the content is ignored except for the nodes that were generated and the values used to update the nodes.Introduces
ReusableComposeNode
that will reuse the node emitted instead of replacing it as is done forComposeNode
. (I1dd86)@ComposeCompilerApi
no longer@RequiresOptIn
(Iab690)
Bug Fixes
- LazyColumn/Row will now keep up to 2 previously visible items active (not disposed) even when they are scrolled out already. This allows the component to reuse the active subcompositions when we will need to compose a new item which improves the scrolling performance. (Ie5555)
Version 1.0.0-beta06
May 5, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta06
is released. Version 1.0.0-beta06 contains these commits.
API Changes
@ComposeCompilerApi
no longer@RequiresOptIn
(Iab690)
Version 1.0.0-beta05
April 21, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta05
is released. Version 1.0.0-beta05 contains these commits.
API Changes
- Removed
@InternalComposeApi
for recording snapshot reads and writes (Id134d)
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.runtime:runtime-*:1.0.0-beta04
is released. Version 1.0.0-beta04 contains these commits.
Bug Fixes
Prior to this change, local composable functions were skippable based on their parameters. After this change, no local composable functions will skip. This change is done because it is common and expected for local functions to capture parameters from the parent and them skipping is a common source of bugs.
To summarize, consider the example:
@Composable fun Counter(count: Int, onCountChange: (Int) -> Unit) { @Composable fun ShowCount() { Text("Count: $count") } ShowCount() Button(onClick={ onCountChange(count + 1) }) { Text("Increment") } }
Prior to this change, the
ShowCount
composable function would always skip, even after thecount
parameter was updated. This is no longer the case. (I5648a)Fixed the issue when
rememberSaveable()
was restoring the old value when used with input params (I1b110, b/182403380)
Version 1.0.0-beta03
March 24, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta03
is released. Version 1.0.0-beta03 contains these commits.
API Changes
DefaultMonotonicFrameClock
is deprecated. CallingwithFrameNanos
orRecomposer.runRecomposeAndApplyChanges
with noMonotonicFrameClock
will now throwIllegalStateException
. (I4eb0d)
Version 1.0.0-beta02
March 10, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta02
is released. Version 1.0.0-beta02 contains these commits.
Bug Fixes
- Enforce restrictions on public usage of experimental APIs (I6aa29, b/174531520)
- Fix for broken
rememberSaveable { mutableStateOf(0) }
when used inside a destination of navigation-compose. (I1312b, b/180042685, b/180701630)
Version 1.0.0-beta01
February 24, 2021
androidx.compose.runtime:runtime-*:1.0.0-beta01
is released. Version 1.0.0-beta01 contains these commits.
This is the first release of Compose 1.0.0 Beta.
API Changes
- Add
Recomposer.runRecomposeConcurrentlyAndApplyChanges
experimental API for recomposing invalidated compositions off the main frame loop. (I342d0) - Any composables marked with @ReadOnlyComposable are now compile-time validated to ensure that they only make calls to other @ReadOnlyComposables (I58961)
The
defaultFactory
forcompositionLocalOf
andstaticCompositionLocalOf
is now required instead of optional.This changes removes a potential type error for non-nullable types where no default factory was provided. Previously this would provide a null reference for a non-nullable type.
For nullable types consider supplying
{ null }
as the default factory.We do not recommend using locals with non-nullable types unless a sensible default can be provided. If no sensible default exists, the
defaultFactory
lambda should throw an exception. However throwing an exception means that consumers of the local will have an implicit dependency on it being provided that is not enforced by the type system. (Ifbd2a)Deprecated symbols were removed from the compose runtime (I3252c)
Deprecated
emptyContent()
is removed. Use{}
instead. (Idb33f, b/179432510)Providers has been renamed to CompositionLocalProvider
- The Composition constructor no longer accepts a key parameter, and has been deprecated.
- currentCompositeKeyHash has been turned into a composable top level property instead of a composable top level function.
- CompositionData and CompositionGroup have been moved to the androidx.compose.runtime.tooling namespace
- ComposableLambda has been made an interface instead of a concrete class, and no longer has type parameters.
- ComposableLambdaN has been made an interface instead of a concrete class, and no longer has type parameters.
- The snapshotFlow function has been moved to the androidx.compose.runtime namespace
- the merge method of SnapshotMutationPolicy is no longer experimental
- The @TestOnly top level clearRoots function has been removed. It is no longer necessary.
- keySourceInfoOf and resetSourceInfo functions have been removed. They are no longer necessary.
- Composer.collectKeySourceInformation has been removed. It is no longer necessary.
- isJoinedKey, joinedKeyLeft, and joinedKeyRight methods have been removed. They are no longer necessary.
- Various top level APIs have been moved and reorganized into different files. Due to Kotlin’s file class semantics, this will break binary compatibility but not source compatibility, so should not be an issue for most users.
- (I99b7d, b/177245490)
SnapshotStateObserver is not Experimental anymore (Id2e6a)
Deleted some previously deprecated APIs (Ice5da, b/178633932)
Made the following Material API changes:
- Added contentPadding parameter to Top/BottomAppBar to allow customizing the default padding.
- Reordered parameters in BackdropScaffold to follow API guidelines for required parameters being before optional parameters.
- Moved
icon
parameter in BottomNavigationItem to be afterselected
andonClick
. - Renamed
alwaysShowLabels
parameter in BottomNavigationItem toalwaysShowLabel
. - Renamed
bodyContent
parameters in a few components to justcontent
. - Reordered parameters in
ButtonDefaults.buttonColors()
. Please note that because the type of the parameters have not changed, this will not cause an error in your code - please ensure you are either using named parameters or update the ordering manually, otherwise your code will not work the same as previously. - Added
secondaryVariant
parameter todarkColors()
. This color is typically the same assecondary
in dark theme, but adding for consistency and further customization. - Removed ElevationDefaults and animateElevation() from the public API surface since they were not commonly used / useful.
- Renamed
onValueChangeEnd
inSlider
toonValueChangeFinished
and made it nullable. - Renamed
text
parameter inSnackbar
tocontent
for consistency. - Added
contentPadding
parameter toDropdownMenuItem
to allow customizing the default padding and madecontent
be an extension onRowScope
. - Renamed
ModalDrawerLayout
toModalDrawer
. - Renamed
BottomDrawerLayout
toBottomDrawer
. - (I1cc66)
Version 1.0.0-alpha12
February 10, 2021
androidx.compose.runtime:runtime-*:1.0.0-alpha12
is released. Version 1.0.0-alpha12 contains these commits.
API Changes
- Support for ViewGroups was removed from UiApplier. The Deprecated emitView composables were removed. (Ifb214)
- CompositionReference renamed to CompositionContext (I53fcb)
- ComponentActivity.setContent has moved to androidx.activity.compose.setContent in the androidx.activity:activity-compose module. (Icf416)
- Snapshot API was updated to be more consistent with API guideline as well as hiding internal implementation classes from the public API. (Id9e32)
- Renamed Ambients to match the Ambient -> CompositionLocal rename. Ambients used to be named AmbientFoo, now CompositionLocals are named LocalFoo. (I2d55d)
- Renamed Ambient to CompositionLocal, and ambientOf / staticAmbientOf to compositionLocalOf / staticCompositionLocalOf respectively. This change helps to make the purpose of CompositionLocal more clear: a mechanism for providing / retrieving values local to a composition. CompositionLocal instances should be prefixed with
Local
, such as val LocalFoo = compositionLocalOf { Foo() }. (Ia55b6) - takeMutableSnapshot and takeSnapshot have moved to be companion methods of Snapshot. (I91f19)
@ComposableContract
has been deprecated in favor of three more specific annotations.@ComposableContract(restartable = false)
has become@NonRestartableComposable
@ComposableContract(readonly = true)
has become@ReadOnlyComposable
@ComposableContract(preventCapture = true)
has become@DisallowComposableCalls
@ComposableContract(tracked = true)
has been removed. (I60a9d)emptyContent() and (@Composable () -> Unit).orEmpty() utilities have been deprecated as they no longer have any positive performance impact or value (I0484d)
snapshotFlow
andwithMutableSnapshot
are no longer experimental (I6a45f)Recomposers can now be closed. Closed recomposers will continue recomposition until composition child coroutines complete. Recomposer.shutDown renamed to cancel to contrast with close. (Ib6d76)
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)The API the Compose compiler plugin targets has been refactored to use an interface instead of a concrete class. The interface also no longer uses a type parameter.
This is an internal change that should not effect source code compatibility but is a binary breaking change. (I3b922, b/169406779)
SnapshotMutableState was introduced (Icfd03)
DisposableEffectDisposable was renamed to DisposaleEffectResult (Ica7c6)
Removed Recomposer.current(). [Abstract]ComposeView now default to lazily created, window-scoped Recomposers driven by the ViewTreeLifecycleOwner for the window. Recomposition and withFrameNanos-based animation ticks are paused while the host Lifecycle is stopped. (I38e11)
Recomposer.runningRecomposers now offers a global StateFlow of read-only RecomposerInfo for observing ongoing composition state in the process. Prefer this API to Recomposer.current(), which is now deprecated. (If8ebe)
DisposableEffectDisposable was renamed to DisposaleEffectResult (I3ea68)
Version 1.0.0-alpha11
January 28, 2021
androidx.compose.runtime:runtime-*:1.0.0-alpha11
is released. Version 1.0.0-alpha11 contains these commits.
API Changes
- onCommit, onDispose, and onActive have been deprecated in favor of SideEffect and DisposableEffect APIs (If760e)
- The emit() API and all overloads have been deprecated and renamed to ComposeNode. The APIs are identical, just a different name in order to follow the naming conventions of Compose (I4137b)
- invalidate and compositionReference() are now deprecated in favor of currentRecomposeScope and rememberCompositionReference respectively. (I583a8)
RememberObserver replaces CompositionLifecycleObserver and CompositionLifecycleObserver is now deprecated.
RememberObserver
is a replacement forCompositionLifecycleObserver
with modified semantics and renamed methods. Changing to the new API can be done mechanically for objects that are only remembered once which is, and continues to be, the recommended practice. However, if a reference was remembered more than once in a compositiononRemembered
is called for each reference whereonEnter
is only called once.onEnter
was called multiple time if the object was used in subcompositions, such asWithConstraints
andScaffold
making the singleonEnter
call guarantee unreliable and it was removed forRememberObserver
.RememberObserver
addsonAbandoned
which is called if theRememberObserver
instance is returned from the callback passed toremember
but was not remembered in the composition state and, therefore, will never haveonRemembered
called. This can occur if an exception terminates composition before completing or the composition is discarded because the state is was producing a composition for is no longer current or otherwise is no longer needed. If the instance ofRememberObserver
following the single reference recommendation above is tracking an external resource bothonForgotten
andonAbandoned
each indicate that the resource is no longer needed. If the object is tracking work started or resources allocated inonRemembered
,onAbandoned
can be ignored as it will not be called ifonRemembered
is called. (I02c36)Do not mark
collectAsState()
functions as inline (Ia73e4)
Bug Fixes
- WithConstraints was reworked as BoxWithConstraints and moved to foundation.layout. (I9420b, b/173387208)
- Leverage TestCoroutineDispatcher in testing (I532b6)
Version 1.0.0-alpha10
January 13, 2021
androidx.compose.runtime:runtime-*:1.0.0-alpha10
is released. Version 1.0.0-alpha10 contains these commits.
Breaking Change
Restructuring of the internal compiler API allows batching changes to the nodes generated as a result of composition into the "apply changes" phase of composition, after all
@Composable
functions have completed.This is a behavioral breaking change that might affect application code as nodes are no longer available from internal and experimental APIs until after changes have been applied. This can usually be worked around by surrounding code with such dependencies in a
SideEffect
composable to defer execution of the code until after the nodes have been created and initialized. (I018da)
API Changes
- Added a way to track if the recomposer has applied changes. (I1b3e2)
Expand [Abstract]ComposeView APIs to allow recycling Compose-based views, disposing their composition to recreate again later. Add APIs for installing and discovering window-scoped Recomposers and CompositionReferences for creating child compositions.
Add ViewCompositionStrategy for configuring the composition disposal strategy of [Abstract]ComposeViews; default behavior is dispose on window detach. (I860ab)
Bug Fixes
- Recomposer now exposes a Flow of its current state, allowing monitoring its activity and the activity of associated effects. (Ifb2b9)
- The native keyEvent can now be accessed through keyEvent.nativeKeyEvent (I87c57, b/173086397)
Version 1.0.0-alpha09
December 16, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha09
is released. Version 1.0.0-alpha09 contains these commits.
API Changes
Removed SlotTable, SlotReader and SlotWriter from the public API. These were marked as InternalComposeAPI previously. Now they are internal to the compose module.
CompositionData and CompositionGroup were added as a replacement for the ui-tooling API to use to extract composition information. These are public but are not intended for use outside the ui-tooling API as they provide the raw information the ui-tooling API interprets (I31a9c)
The Applier class is no longer considered an (Id85b0)
The
Applier
interface has changed to simplify building trees bottom-up instead of top-down.The
insert()
method has been renamed toinsertTopDown()
.A new method,
insertBottomUp()
, was added.An applier either inserts nodes into the tree it is editing using
insertTopDown()
orinsertBottomUp()
depending on which performs better.Some trees, such as
LayoutNode
andView
, are much more efficient to build bottom-up than top-down. Prior to this change, a stack of inserts was required to implement bottom-up which needed to be copied to every applier which needed bottom-up construction for performance. With this change anApplier
overridesinsertBottomUp()
to build a tree bottom-up andinsertTopDown()
to build the tree top-down. (Icbdc2)Compose supports property getters that can make composable invocations. Support for this is not going away, but the syntax for declaring a property getter as being @Composable is changing.
The now-deprecated syntax for doing this was by annotating the property itself:
@Composable val someProperty: Int get() = ...
The now-correct syntax for doing this is by annotating the getter of the property:
val someProperty: Int @Composable get() = ...
Both syntaxes will work for some time, but the former deprecated syntax will eventually become a compile error. (Id9197)
Bug Fixes
- AndroidOwner made internal (Ibcad0, b/170296980)
- subcomposeInto(LayoutNode) was made internal (Id724a)
Version 1.0.0-alpha08
December 2, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha08
is 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 tocontent
, according to the lint check and guidance. (Iec48e) - Recomposer no longer accepts an EmbeddingContext; required scheduling dependencies are obtained from the effectCoroutineContext. FrameManager is deprecated; platform integrations should initialize their own global snapshot handling. (I02369)
- RestorableStateHolder.withRestorableState function was renamed to RestorableStateProvider (I66640)
Bug Fixes
- 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) - Remove old ui-test module and its stubs (I3a7cb)
Version 1.0.0-alpha07
November 11, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha07
is released. Version 1.0.0-alpha07 contains these commits.
New Features
API Changes
- The
@UnionType
annotation has been deprecated (I57cde) - provideDefault was added as an alternative to provide for providing ambients, and it can be used to specify ambient values that will only be set when there is no ambient value already provided. (Id6635, b/171024925)
- LaunchedTask was renamed to LaunchedEffect for consistency with the SideEffect and DisposableEffect APIs. LaunchedEffect with no subject params is not permitted in order to encourage best practices. (Ifd3d4)
- Applier now has onBeginChanges/onEndChanges callbacks that are invoked when a Composer begins/is finished applying changes to the tree. These may be used for batching resource management if needed. (Icf476)
- Recomposer now requires a CoroutineContext at construction (Ic4610)
- Changes to the internal SlotTable implementation which should not affect the public API. (If9828)
- Deprecated rxjava2 adapters which does not take the initial value were removed (Idb72f)
Bug Fixes
- 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)
- BaseTextField has been deprecated. Use BasicTextField instead. (I896eb)
- Several layout related symbols were moved from androidx.compose.ui to androidx.compose.layout.ui. (I0fa98, b/170475424)
External Contribution
- Added
runtime-rxjava3
module for compose. Similar toruntime-rxjava2
(I02cbf)
Version 1.0.0-alpha06
October 28, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha06
is released. Version 1.0.0-alpha06 contains these commits.
API Changes
- Recomposer is now a CompositionReference and a valid composition parent. Explicit Recomposer is now required in fewer places. (I4036f)
- Added DisposableEffect counterpart API to SideEffect, filling
the role of onCommit-with-params but with a required onDispose.
- Added rememberUpdatedState API to publish data from recomposition to ongoing or long-lived processes such as DisposableEffects or LaunchedTasks.
- (Id50b9)
- MutableVector now implements RandomAccess (I85d73, b/170461551)
- Added SideEffect composable for applying side effects of composition to objects managed by the composition. SideEffect is intended to replace the onCommit composable. (Ia77c2)
- New experimental api RestorableStateHolder. It allows to save the state defined with [savedInstanceState] and [rememberSavedInstanceState] for the subtree before disposing it to make it possible to compose it back next time with the restored state. (I66884, b/166586419)
Bug Fixes
- Enable transitions in ComposeTestRule; remove option to enable the blinking cursor from ComposeTestRule. (If0de3)
Version 1.0.0-alpha05
October 14, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha05
is released. Version 1.0.0-alpha05 contains these commits.
API Changes
- Experimental Modifier.pointerInput suspending input modifier (Ia77d2)
- The scrolling performance of LazyColumn/Row is improved by doing less work in subcomposition on every scroll. The new hasInvalidations() method was added for Composition class. hasPendingChanges() method from Recomposer was renamed to hasInvalidations() (Ib2f32, b/168293643, b/167972292, b/165028371)
- Add produceState API for launching coroutines from composition
that update a single
State<T>
value over time (Id4a57) - launchInComposition renamed to LaunchedTask to match Compose API guidelines (I99a8e)
- The order of place() calls in custom Layouts now defines the drawing order for the children (Ibc9f6)
Version 1.0.0-alpha04
October 1, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha04
is released. Version 1.0.0-alpha04 contains these commits.
API Changes
- Added OwnerScope to allow collection of layout and drawing observation scopes once they are no longer valid. (Ic4cf8)
- Added derivedStateOf API to create State objects based on a calculation which may read (and derive from) other State objects (If758b)
- Added TestOnly API for SnapshotStateObserver (I6e2a9)
Bug Fixes
- foundation.Box was deprecated. Please use foundation.layout.Box instead. (Ie5950, b/167680279)
Version 1.0.0-alpha03
September 16, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha03
is released. Version 1.0.0-alpha03 contains these commits.
API Changes
CompositionCoroutineScope
no longer implementsMonotonicFrameClock
. Callers ofwithFrameNanos
should import the top-level function explicitly. (Icb642, b/166778123)
Bug Fixes
- Global testing functions such as
onNode
orwaitForIdle
are now deprecated, please migrate to their new counterparts that are defined on ComposeTestRule (I7f45a) launchInComposition
no longer launches coroutines undispatched (Ief6af, b/166486000)
Version 1.0.0-alpha02
September 2, 2020
androidx.compose.runtime:runtime-*:1.0.0-alpha02
is released. Version 1.0.0-alpha02 contains these commits.
API Changes
- Add
snapshotFlow
andwithMutableSnapshot
APIs for consuming and producing Snapshot data changes. (I3e722) The calling convention for composable functions has changed. This is a binary breaking change. All libraries must be recompiled to work with this version of the compose compiler plugin.
This change does not create a source level breaking change as the only APIs that have changed are compiler APIs that have an explicit opt in. (I7afd2, b/158123185)
Removed scheduling methods from EmbeddingContext (I7b9be)
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.runtime:runtime-*:1.0.0-alpha01
is released. Version 1.0.0-alpha01 contains these commits.
Version 0.1.0-dev
Version 0.1.0-dev17
August 19, 2020
androidx.compose.runtime:runtime-*:0.1.0-dev17
is released. Version 0.1.0-dev17 contains these commits.
API Changes
- Custom emits can now declare that one or more of its setters can be skipped and recomposed independently of the emit. (Ibbd13)
Removed deprecated FrameManager calls.
Internal compose APIs have been changed to reduce the amount of overhead to track state objects such as
mutableStateof()
(I80ba6)The
state { ... }
composable is now deprecated in favor of explicit calls toremember { mutableStateOf(...) }
for clarity. This reduces the overall API surface and number of concepts for state management, and matches theby mutableStateOf()
pattern for class property delegation. (Ia5727)Flow.collectAsState now determines the default dispatcher from the composition itself rather than defaulting to Dispatchers.Main. (I9c1d9)
Crash when something which saves the state was used inside the for loop is fixed. Now having the same key in savedInstanceState() is allowed, api of UiSavedStateRegistry is now adjusted to this new requirement (I4ab76, b/160042650, b/156853976, b/159026663, b/154920561)
Bug Fixes
emitView
was deprecated. UseAndroidView
instead if possible for emitting Views inside Compose. Note that composing Views and ViewGroups directly will not be supported in the future unless these are leaves in the composition tree, case when this can be achieved using AndroidView. (I29b1e, b/163871221)
Version 0.1.0-dev16
August 5, 2020
androidx.compose.runtime:runtime-*:0.1.0-dev16
is released. Version 0.1.0-dev16 contains these commits.
API Changes
The default mutation policy of
mutableStateOf()
,ambientOf()
andsavedInstanceStateOf()
has changed to bestructuralEqualityPolicy()
instead ofreferentialEqualityPolicy()
.The default for deciding if a new value assigned to a
mutableStateOf()
instance is considered a change now defaults to using==
instead of using===
.See https://kotlinlang.org/docs/reference/equality.html
ambientOf()
andsavedInstanceStateOf()
usemutableStateOf()
in their implementations so they were changed to be consistent withmutableStateOf()
.Using structural equality more closely matches developer expectations.
For example,
val state = mutableStateOf(1f)
followed by,
state.value = 1f
will no longer be consider a change to
state
and uses ofstate
during composition will no longer need to be recomposed.This is a breaking change but, in most cases (such when using classes that do not override
equals()
), this will not have a noticeable effect on an application.Classes that do override
equals()
, such asdata
classes, might see a performance degradation as theirequals()
methods are now, by default, called when assigned to amutableStateOf()
.The previous behavior can be restored by adding the policy parameter
policy = referentialEqualityPolicy()
to calls tomutableStateOf()
,ambientOf()
andsavedInstanceStateOf()
. (Ic21a7)Row
andColumn
are now inline function significantly reducing the overhead of using them. (I75c10)
Bug Fixes
- setViewContent was deprecated. setContent should be used instead. (I7e497, b/160335130)
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 MonotonicFrameClock equivalent of ManualAnimationClock is now ManualFrameClock. (I111c7, b/161247083)
Modifier.stateDraggable was completely reworked and renamed to Modifier.swipeable. A new SwipeableState class was introduced, and DrawerState and BottomDrawerState were refactored to inherit from it. [Modal/Bottom]DrawerLayout no longer take an onStateChange parameter. (I72332, b/148023068)
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)SubcomposeLayout is added. It is a low level primitive which allows to compose the children during the measuring if we want to use some values available only later during the measure for the subtree composition. For example WithConstraints is not implemented using SubcomposeLayout. (I25cc8)
Material FilledTextField was renamed to TextField and foundational TextField was renamed to BaseTextField to make simplest desired API easy to discover and use (Ia6242, b/155482676)
Modifier.drawBackground has been renamed to Modifier.background (I13677)
Version 0.1.0-dev15
July 22, 2020
androidx.compose.runtime:runtime-*:0.1.0-dev15
is 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
@Model
annotation is now deprecated. Use state and mutableStateOf as alternatives. This deprecation decision was reached after much careful discussion.Justification
Rationale includes but is not limited to:
- Reduces API surface area and concepts we need to teach
- More closely aligns with other comparable toolkits (Swift UI, React, Flutter)
- Reversible decision. We can always bring
@Model
back later. - Removes corner-case usage and difficult to answer questions about configuring
@Model
as things we need to handle @Model
data classes, equals, hashcode, etc.- How do I have some properties “observed” and others not?
- How do I specify structural vs. referential equality to be used in observation?
- Reduces “magic” in the system. Would reduce the likelihood of someone assuming system was smarter than it is (ie, it knowing how to diff a list)
- Makes the granularity of observation more intuitive.
- Improves refactorability from variable -> property on class
- Potentially opens up possibilities to do hand-crafted State-specific optimizations
- More closely aligns with the rest of the ecosystem and reduces ambiguity towards immutable or us “embracing mutable state”
Migration Notes
Almost all existing usages of
@Model
are fairly trivially transformed in one of two ways. The example below has a@Model
class with two properties just for the sake of example, and has it being used in a composable.@Model class Position( var x: Int, var y: Int ) @Composable fun Example() { var p = remember { Position(0, 0) } PositionChanger( position=p, onXChange={ p.x = it } onYChange={ p.y = it } ) }
Alternative 1: Use
State<OriginalClass>
and create copies.This approach is made easier with Kotlin’s data classes. Essentially, make all previously
var
properties intoval
properties of a data class, and then usestate
instead ofremember
, and assign the state value to cloned copies of the original using the data classcopy(...)
convenience method.It’s important to note that this approach only works when the only mutations to that class were done in the same scope that the
State
instance is created. If the class is internally mutating itself outside of the scope of usage, and you are relying on the observation of that, then the next approach is the one you will want to use.data class Position( val x: Int, val y: Int ) @Composable fun Example() { var p by state { Position(0, 0) } PositionChanger( position=p, onXChange={ p = p.copy(x=it) } onYChange={ p = p.copy(y=it) } ) }
Alternative 2: Use mutableStateOf and property delegates
This approach is made easier with Kotlin’s property delegates and the
mutableStateOf
API which allows you to create MutableState instances outside of composition. Essentially, replace allvar
properties of the original class withvar
properties withmutableStateOf
as their property delegate. This has the advantage that the usage of the class will not change at all, only the internal implementation of it. The behavior is not completely identical to the original example though, as each property is now observed/subscribed to individually, so the recompositions you see after this refactor could be more narrow (a good thing).class Position(x: Int, y: Int) { var x by mutableStateOf(x) var y by mutableStateOf(y) } // source of Example is identical to original @Composable fun Example() { var p = remember { Position(0, 0) } PositionChanger( position=p, onXChange={ p.x = it } onYChange={ p.y = it } ) }
(I409e8, b/152050010, b/146362815, b/146342522, b/143413369, b/135715219, b/143263925, b/139653744)
Changes the code generation strategy of Compose’s compiler. Prior to the change, the compose compiler would transform calls to composable functions. With this change, we now transform the body of a composable function and leave the callsite unaltered (mostly).
This means that most of the logic communicating with the compose runtime happens at the start of the function body, instead of at the callsite.
This should be a source-compatible change for all usage of compose. Most users of compose should not have to update any code as a result of this change.
In order to support this work, the JVM signature of all composable functions has changed. A Composable function accepting a single parameter is transformed into a function accepting 3 parameters, the additional parameters are the Composer, a ‘key’ integer. a bitmask integer used to propagate metadata through calls.
Compose now also transforms default arguments to a composable function. It does this without introducing an additional synthetic default overload of the function itself, so this change will result in fewer functions being defined.
Known intentional behavioral changes resulting from this:
- Some calls will skip where they wouldn’t have previously
- Composable expressions in default argument expressions are now correctly subscribed to and handled
This work included some optimizations: 1. The result of comparisons of parameters are propagated through the call graph to other composable functions. This will result in fewer comparisons at runtime, reduces the slot table size, as well as more skipping of composable functions that were previously not skipped 2. Paremeters which are determined to be “static” at compile time are no longer compared or stored in the runtime. This reduces the number of comparisons and reduces slot table size. 3. Control flow structure of the body of functions is used to minimize the number of groups that are generated. This reduces slot table size and results in less work for the runtime 4. Unused dispatch and receiver parameters to functions are not included in determining skippability of the function if they are not used inside of the body of the function.
Most breaking changes were for APIs that the compiler targets directly, and typical use of compose will not be affected: 1. Composer::startExpr was removed 2. Composer::endExpr was removed 3. Composer::call was deprecated 4. The non-varargs overloads of
key
have been removed. Use thevararg
version going forward. 5. The Pivotal annotation was deprecated. Usekey
as a replacement. 6. ScopeUpdateScope::updateScope was changed to expect a Function3 instead of Function1 7. restartableFunction and restartableFunctionN were updated to include additional compile time parameters (I60756, b/143464846)Added sortWith and removeRange to MutableVector (Icccf7)
Added default method implementations for CompositionLifecycleObserver (I24289)
Applier now requires a clear() method for disposing compositions (Ibe697)
Added asMutableList() to MutableVector to allow it to be passed to public API without having to copy the entire list. (I298df)
Added rememberCoroutineScope() to obtain a managed CoroutineScope in composition for launching jobs in response to events. (I0e264)
MutableVector is a new collection that does not implement any of the standard Collection interface. This collection offers speed above other requirements and is intended to only be used in internal implementations. (I8ebd6)
Temporarily removed
StableMutableList
andStableMutableMap
to avoid an issue in the version of Kotlin compose requires. These interfaces will be reintroduced once compose is updated to a version of Kotlin that doesn't have the issue.SnapshotStateList
andSnapshotStateMap
are now public but they will be deprecated onceStableMutableList
andStableMutableMap
are restored. (Ia7769)add top-level withFrameNanos function for animation timing (Ie34c5)
@Untracked annotation has been deprecated. Replace with @ComposableContract(tracked=false) (Id211e)
RestartableFunction and associated APIs have been renamed to ComposableLambda, etc. These APIs were targeted only by the compiler so this should not affect source level compatibility normally. The rename was done primarily to communicate what this class is better when it shows up in stack traces (I7eb25)
@Composable annotation is no longer valid on classes (Ia5f02)
Ambient<T>
is now @Stable instead of @Immutable (I0b4bb)Prior to this change, the compose compiler plugin would non-trivially intercept calls to constructors inside of a @Composable function if there was an (I5205a, b/158123804)
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)Observe is no longer a useful abstraction. If you need to replicate it, its implementation can be replicated by just creating a composable function which executes a composable lambda parameter. For example,
@Composable fun Observe(body: @Composable () -> Unit) = body()
(I40d37)@Direct was deprecated in favor of @ComposableContract(restartable=false) (If4708)
Added an adapter for the recently introduced StateFlow which allows as to pre-populate the initial value so the returned State is non-nullable (I61dd8, b/156233789)
Added an adapter for Flow. Example of the usage: val value by flow.collectAsState() (If2198, b/153375923)
[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 { ... }
orby mutableStateOf(...)
. (I5312c)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
orsetViewContent
instead. Compose.disposeComposition has been deprecated. Use thedispose
method on theComposition
returned bysetContent
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)Updated the
ComposeFlags.COMPOSER_PARAM
flag to betrue
, which will change the code generation strategy for the compose plugin. At a high level, this causes @Composable functions to be generated with an additional synthetic parameter, which is passed through to subsequent @Composable calls in order for the runtime to properly manage execution. This is a significant binary breaking change, however, should preserve source-level compatibility in all sanctioned usage of compose. (I7971c)Breaking changes to the ambients API. See log and
Ambient<T>
documentation for details (I4c7ee, b/143769776)Added ui-livedata - new artifact with an adapter for LiveData. Example of the usage: val value by liveData.observeAsState() (Ie9e8c, b/150465596)
Rx adapters without explicit initial value are deprecated. Using null is not always the best default, for example when you have a List it is better to start with emptyList() or any other reasonable default (I00025, b/161348384)
Added ui-rxjava2 - new artifact with adapters for RxJava2. Example of the usage: val value by observable.subscribeAsState() (Ifab4b, b/153369097)
savedInstanceState()
can now be used with nullable types (I6847f, b/153532190)New listSaver() and mapSaver() to make it easier to write custom Saver objects (I8cf68, b/152331508)
New functions: savedInstanceState() and rememberSavedInstanceState(). They are similar to state() and remember() but have a saved instance state support build in (If1987, b/152025209)
Bug Fixes
runOnIdleCompose
renamed torunOnIdle
(I83607)- Made LayoutNode experimental API (I4f2e9)
- androidx.ui.foundation.TextFieldValue and androidx.ui.input.EditorValue is deprecated. TextField, FilledTextField and CoreTextField composables that uses that type is also deprecated. Please use androidx.ui.input.TextFieldValue instead (I4066d, b/155211005)
- Removed deprecated DrawBackground API in favor of drawBackground extension APIs on Modifier. Refactored color, brush and paint drawBackground implementations to reduce code paths as well as remove requirement for Modifier to be created as part of composition. (I0343a)
- 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)
- WithConstraints trailing lambda API has been changed. Now instead of two params it has a receiver scope which in addition to constraints and layoutDirection provides minWidth, maxWidth, minHeight and maxHeight properties in Dp (I91b9a, b/149979702)
- Added symmetric padding modifier. (I39840)
- Updated wrapContentWidth and wrapContentHeight to expect vertical or horizontal Alignment rather than any Alignment. The gravity modifier was updated to accept vertical or horizontal Alignment. Row, Column and Stack were updated to support custom continuous Alignments. (Ib0728)
- 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)
- 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)
- RowScope and ColumnScope members are now accessible outside Row and Column. (I3a641)
- Renamed LayoutFlexible to LayoutWeight. Renamed tight parameter to fill. (If4738)
- WithConstraints got LayoutDirection parameter (I6d6f7)
- Renamed background to DrawBackground and make it to be memorized by default (Ia0bd3)
- Replaced ButtonStyle with distinct functions and removed text (string) overload. See updated samples for usage information. (If63ab, b/146478620, b/146482131)
runOnIdleCompose
andrunOnUiThread
are now global functions instead of methods on ComposeTestRule. (Icbe8f)
External Contribution
- Remove unneeded API such as Looper and Handler from Compose Runtime porting layer (I6847d)
- Deprecate
Flow<T>.collectAsState()
with no initial value. UseStateFlow<T>
or pass an explicit initial value instead. (I63f98, b/157674865)