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Add startup benchmark (#492)
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9 files changed

+92
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‎android/app/build.gradle.kts

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@@ -53,6 +53,11 @@ android {
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applicationIdSuffix = ".fast"
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signingConfig = signingConfigs.getByName("debug")
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}
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create("benchmark") {
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initWith(buildTypes.getByName("release"))
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signingConfig = signingConfigs.getByName("debug")
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matchingFallbacks += listOf("release")
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}
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release {
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isDebuggable = false
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isMinifyEnabled = true

‎android/app/src/main/AndroidManifest.xml

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@@ -16,6 +16,8 @@
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android:theme="@style/Theme.HackerNews"
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tools:targetApi="31">
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<profileable android:shell="true" />
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<!-- This demonstrates manual initialization of Reaper.
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See https://docs.emergetools.com/docs/reaper-setup-android#disable-automatic-initialization -->
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<provider

‎android/benchmark/.gitignore

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/build

‎android/benchmark/build.gradle.kts

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plugins {
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alias(libs.plugins.android.test)
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alias(libs.plugins.kotlin.android)
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}
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android {
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namespace = "com.emergetools.hackernews.benchmark"
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compileSdk = 35
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defaultConfig {
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testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
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minSdk = 30
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targetSdk = 35
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}
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buildTypes {
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// This benchmark buildType is used for benchmarking, and should function like your
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// release build (for example, with minification on). It"s signed with a debug key
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// for easy local/CI testing.
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create("benchmark") {
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isDebuggable = true
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signingConfig = getByName("debug").signingConfig
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matchingFallbacks += listOf("release")
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_17
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targetCompatibility = JavaVersion.VERSION_17
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}
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kotlinOptions {
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jvmTarget = JavaVersion.VERSION_17.toString()
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}
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targetProjectPath = ":app"
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experimentalProperties["android.experimental.self-instrumenting"] = true
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}
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dependencies {
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implementation(libs.androidx.junit)
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implementation(libs.androidx.espresso.core)
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implementation(libs.androidx.uiautomator)
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implementation(libs.androidx.benchmark.macro.junit4)
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}
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androidComponents {
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beforeVariants(selector().all()) {
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it.enable = it.buildType == "benchmark"
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}
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}

‎android/benchmark/src/main/AndroidManifest.xml

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<manifest />

‎android/benchmark/src/main/java/com/emergetools/hackernews/benchmark/StartupBenchmark.kt

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package com.emergetools.hackernews.benchmark
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import androidx.benchmark.macro.StartupMode
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import androidx.benchmark.macro.StartupTimingMetric
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import androidx.benchmark.macro.junit4.MacrobenchmarkRule
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import androidx.test.ext.junit.runners.AndroidJUnit4
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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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@RunWith(AndroidJUnit4::class)
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class StartupBenchmark {
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@get:Rule
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val benchmarkRule = MacrobenchmarkRule()
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@Test
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fun startup() = benchmarkRule.measureRepeated(
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packageName = "com.emergetools.hackernews",
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metrics = listOf(StartupTimingMetric()),
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iterations = 5,
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startupMode = StartupMode.COLD
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) {
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pressHome()
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startActivityAndWait()
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}
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}

‎android/build.gradle.kts

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@@ -8,4 +8,5 @@ plugins {
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alias(libs.plugins.roborazzi) apply false
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alias(libs.plugins.androidx.room) apply false
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alias(libs.plugins.sentry) apply false
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alias(libs.plugins.android.test) apply false
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}

‎android/gradle/libs.versions.toml

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@@ -29,6 +29,8 @@ jsoup = "1.20.1"
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extendedspans = "1.4.0"
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composeBom = "2025.06.00"
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uiTestJunit4Android = "1.8.3"
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uiautomator = "2.2.0"
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benchmarkMacroJunit4 = "1.2.0-beta01"
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[libraries]
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androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -74,6 +76,8 @@ roborazzi-rule = { group = "io.github.takahirom.roborazzi", name = "roborazzi-ju
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androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
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androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
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androidx-ui-test-junit4-android = { group = "androidx.compose.ui", name = "ui-test-junit4-android", version.ref = "uiTestJunit4Android" }
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androidx-uiautomator = { group = "androidx.test.uiautomator", name = "uiautomator", version.ref = "uiautomator" }
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androidx-benchmark-macro-junit4 = { group = "androidx.benchmark", name = "benchmark-macro-junit4", version.ref = "benchmarkMacroJunit4" }
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[plugins]
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android-application = { id = "com.android.application", version.ref = "agp" }
@@ -85,4 +89,5 @@ emerge = { id = "com.emergetools.android", version.ref = "emergePlugin" }
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sentry = { id = "io.sentry.android.gradle", version.ref = "sentry" }
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roborazzi = { id = "io.github.takahirom.roborazzi", version.ref = "roborazzi" }
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androidx-room = { id = "androidx.room", version.ref = "room" }
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android-test = { id = "com.android.test", version.ref = "agp" }
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‎android/settings.gradle.kts

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@@ -49,3 +49,4 @@ dependencyResolutionManagement {
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rootProject.name = "hacker-news"
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include(":app")
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include(":benchmark")

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