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feat: Mechanics
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‎mechanics/Android.bp‎

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// Copyright (C) 2024 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package {
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default_team: "trendy_team_motion",
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default_applicable_licenses: ["Android-Apache-2.0"],
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}
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android_library {
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name: "mechanics",
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manifest: "AndroidManifest.xml",
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sdk_version: "system_current",
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min_sdk_version: "31",
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static_libs: [
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"androidx.compose.runtime_runtime",
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"androidx.compose.material3_material3",
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"androidx.compose.ui_ui-util",
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"androidx.compose.foundation_foundation-layout",
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],
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srcs: [
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"src/**/*.kt",
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],
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kotlincflags: ["-Xjvm-default=all"],
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}

‎mechanics/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?><!--
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Copyright (C) 2024 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.android.mechanics">
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</manifest>

‎mechanics/TEST_MAPPING‎

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{
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"presubmit": [
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{
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"name": "mechanics_tests",
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"options": [
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{"exclude-annotation": "org.junit.Ignore"},
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{"exclude-annotation": "androidx.test.filters.FlakyTest"}
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]
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},
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{
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"name": "SystemUIGoogleTests",
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"options": [
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{"exclude-annotation": "org.junit.Ignore"},
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{"exclude-annotation": "androidx.test.filters.FlakyTest"}
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]
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},
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{
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"name": "PlatformComposeSceneTransitionLayoutTests"
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},
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{
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"name": "PlatformComposeCoreTests"
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}
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],
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"presubmit-large": [
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{
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"name": "SystemUITests",
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"options": [
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{"exclude-annotation": "org.junit.Ignore"},
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{"exclude-annotation": "androidx.test.filters.FlakyTest"}
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]
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}
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],
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"wm-cf": [
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{
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"name": "WMShellUnitTests"
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}
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]
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}

‎mechanics/benchmark/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools">
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<!--
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Important: disable debugging for accurate performance results
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In a com.android.library project, this flag must be disabled from this
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manifest, as it is not possible to override this flag from Gradle.
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-->
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<application
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android:debuggable="false"
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tools:ignore="HardcodedDebugMode"
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tools:replace="android:debuggable" />
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</manifest>

‎mechanics/benchmark/benchmark-proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile
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-dontobfuscate
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-ignorewarnings
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-keepattributes *Annotation*
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-dontnote junit.framework.**
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-dontnote junit.runner.**
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-dontwarn androidx.test.**
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-dontwarn org.junit.**
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-dontwarn org.hamcrest.**
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-dontwarn com.squareup.javawriter.JavaWriter
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-keepclasseswithmembers @org.junit.runner.RunWith public class *

‎mechanics/benchmark/tests/src/com/android/mechanics/benchmark/ComposeBaselineBenchmark.kt‎

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/*
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* Copyright (C) 2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.mechanics.benchmark
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import androidx.benchmark.junit4.BenchmarkRule
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import androidx.benchmark.junit4.measureRepeated
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import androidx.compose.animation.core.Animatable
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import androidx.compose.runtime.mutableFloatStateOf
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import androidx.compose.runtime.snapshotFlow
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import androidx.compose.runtime.snapshots.Snapshot
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import androidx.compose.ui.util.fastForEach
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import androidx.test.ext.junit.runners.AndroidJUnit4
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import kotlinx.coroutines.flow.launchIn
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import kotlinx.coroutines.flow.onEach
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import kotlinx.coroutines.launch
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import org.junit.Rule
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import org.junit.Test
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import org.junit.runner.RunWith
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import platform.test.motion.compose.runMonotonicClockTest
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/** Benchmark, which will execute on an Android device. Previous results: go/mm-microbenchmarks */
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@RunWith(AndroidJUnit4::class)
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class ComposeBaselineBenchmark {
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@get:Rule val benchmarkRule = BenchmarkRule()
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// Compose specific
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@Test
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fun writeState_1snapshotFlow() = runMonotonicClockTest {
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val composeState = mutableFloatStateOf(0f)
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var lastRead = 0f
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snapshotFlow { composeState.floatValue }.onEach { lastRead = it }.launchIn(backgroundScope)
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benchmarkRule.measureRepeated {
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composeState.floatValue++
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Snapshot.sendApplyNotifications()
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testScheduler.advanceTimeBy(16)
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}
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check(lastRead == composeState.floatValue) {
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"snapshotFlow lastRead $lastRead != ${composeState.floatValue} (current composeState)"
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}
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}
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@Test
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fun writeState_100snapshotFlow() = runMonotonicClockTest {
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val composeState = mutableFloatStateOf(0f)
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repeat(100) { snapshotFlow { composeState.floatValue }.launchIn(backgroundScope) }
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benchmarkRule.measureRepeated {
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composeState.floatValue++
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Snapshot.sendApplyNotifications()
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testScheduler.advanceTimeBy(16)
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}
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}
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@Test
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fun readAnimatableValue_100animatables_keepRunning() = runMonotonicClockTest {
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val anim = List(100) { Animatable(0f) }
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benchmarkRule.measureRepeated {
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testScheduler.advanceTimeBy(16)
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anim.fastForEach {
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it.value
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if (!it.isRunning) {
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launch { it.animateTo(if (it.targetValue != 0f) 0f else 1f) }
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}
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}
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}
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testScheduler.advanceTimeBy(2000)
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}
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@Test
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fun readAnimatableValue_100animatables_restartEveryFrame() = runMonotonicClockTest {
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val animatables = List(100) { Animatable(0f) }
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benchmarkRule.measureRepeated {
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testScheduler.advanceTimeBy(16)
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animatables.fastForEach { animatable ->
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animatable.value
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launch { animatable.animateTo(if (animatable.targetValue != 0f) 0f else 1f) }
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}
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}
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testScheduler.advanceTimeBy(2000)
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}
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}

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