Implement Baseline and Startup Profiles, unify libs.versions.toml, update minSdk to 26

.github/workflows/ci.yml

@@ -43,9 +43,9 @@ jobs:
       - name: Run Compose UI tests
         uses: ReactiveCircus/android-emulator-runner@v2
         with:
-          api-level: 24
+          api-level: 26
           disable-animations: false
-          script: ./gradlew connectedCheck --stacktrace
+          script: ./gradlew basic-feature:connectedCheck --stacktrace
 
       - name: Run Maestro UI tests
         uses: mobile-dev-inc/action-maestro-cloud@v1

README.md

@@ -37,6 +37,7 @@ Supports light/dark mode theming automatically.
 * Room - for local database
 * Coil - for image loading
 * Version Catalog - for dependency management
+* Baseline and Startup Profiles - for performance improvements during app launch
 * Timber - for logging
 * JUnit5, Turbine and MockK - for unit tests
 * Jetpack Compose test dependencies, Maestro and Hilt - for UI tests

app/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     alias(libs.plugins.android.application)
+    alias(libs.plugins.baseline.profile)
     alias(libs.plugins.detekt)
     alias(libs.plugins.hilt)
     alias(libs.plugins.kotlin)
@@ -13,7 +14,7 @@ android {
 
     defaultConfig {
         applicationId = "eu.krzdabrowski.starter"
-        minSdk = 24
+        minSdk = 26
         targetSdk = 34
         versionCode = 1
         versionName = "1.0"
@@ -37,10 +38,6 @@ android {
         }
     }
 
-    compileOptions {
-        isCoreLibraryDesugaringEnabled = true
-    }
-
     composeOptions {
         kotlinCompilerExtensionVersion = libs.versions.compose.compiler.get()
     }
@@ -54,6 +51,10 @@ android {
     }
 }
 
+baselineProfile {
+    dexLayoutOptimization = true
+}
+
 dependencies {
     implementation(project(":core"))
     implementation(project(":basic-feature"))
@@ -63,11 +64,12 @@ dependencies {
     implementation(libs.room.ktx)
     implementation(libs.timber)
 
+    implementation(libs.test.android.profile.installer)
+    baselineProfile(project(":baseline-profiles"))
+
     ksp(libs.hilt.compiler)
     ksp(libs.room.compiler)
 
-    coreLibraryDesugaring(libs.desugar)
-
     detektPlugins(libs.detekt.compose.rules)
 }
 

app/src/main/AndroidManifest.xml

@@ -15,6 +15,6 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.AndroidStarter"
-        tools:targetApi="31" />
+        tools:targetApi="34" />
 
 </manifest>

baseline-profiles/.gitignore

@@ -0,0 +1 @@
+/build

baseline-profiles/build.gradle.kts

@@ -0,0 +1,49 @@
+@file:Suppress("UnstableApiUsage")
+
+plugins {
+    alias(libs.plugins.android.test)
+    alias(libs.plugins.baseline.profile)
+    alias(libs.plugins.detekt)
+    alias(libs.plugins.kotlin)
+    alias(libs.plugins.ktlint)
+}
+
+android {
+    compileSdk = 34
+    namespace = "eu.krzdabrowski.starter.baselineprofiles"
+
+    with (defaultConfig) {
+        minSdk = 28
+        targetSdk = 34
+    }
+
+    defaultConfig {
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    kotlin {
+        jvmToolchain(17)
+    }
+
+    targetProjectPath = ":app"
+}
+
+androidComponents {
+    onVariants { v ->
+        v.instrumentationRunnerArguments.put(
+            "targetAppId",
+            v.testedApks.map { v.artifacts.getBuiltArtifactsLoader().load(it)?.applicationId }
+        )
+    }
+}
+
+baselineProfile {
+    useConnectedDevices = true
+}
+
+dependencies {
+    implementation(libs.test.android.benchmark.macro)
+    implementation(libs.test.android.junit)
+
+    detektPlugins(libs.detekt.compose.rules)
+}

baseline-profiles/src/main/java/eu/krzdabrowski/starter/baselineprofiles/BaselineProfileGenerator.kt

@@ -0,0 +1,66 @@
+package eu.krzdabrowski.starter.baselineprofiles
+
+import androidx.benchmark.macro.junit4.BaselineProfileRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * This test class generates a basic startup baseline profile for the target package.
+ *
+ * We recommend you start with this but add important user flows to the profile to improve their performance.
+ * Refer to the [baseline profile documentation](https://d.android.com/topic/performance/baselineprofiles)
+ * for more information.
+ *
+ * You can run the generator with the "Generate Baseline Profile" run configuration in Android Studio or
+ * the equivalent `generateBaselineProfile` gradle task:
+ * ```
+ * ./gradlew :app:generateReleaseBaselineProfile
+ * ```
+ * The run configuration runs the Gradle task and applies filtering to run only the generators.
+ *
+ * Check [documentation](https://d.android.com/topic/performance/benchmarking/macrobenchmark-instrumentation-args)
+ * for more information about available instrumentation arguments.
+ *
+ * After you run the generator, you can verify the improvements running the [StartupBenchmarks] benchmark.
+ *
+ * When using this class to generate a baseline profile, only API 33+ or rooted API 28+ are supported.
+ *
+ * The minimum required version of androidx.benchmark to generate a baseline profile is 1.2.0.
+ **/
+@RunWith(AndroidJUnit4::class)
+class BaselineProfileGenerator {
+
+    @get:Rule
+    val rule = BaselineProfileRule()
+
+    @Test
+    fun generate() {
+        // The application id for the running build variant is read from the instrumentation arguments.
+        rule.collect(
+            packageName = InstrumentationRegistry.getArguments().getString("targetAppId")
+                ?: throw IllegalArgumentException("targetAppId not passed as instrumentation runner arg"),
+
+            // See: https://d.android.com/topic/performance/baselineprofiles/dex-layout-optimizations
+            includeInStartupProfile = true,
+        ) {
+            // This block defines the app's critical user journey. Here we are interested in
+            // optimizing for app startup. But you can also navigate and scroll through your most important UI.
+
+            // Start default activity for your app
+            pressHome()
+            startActivityAndWait()
+
+            // Write more interactions to optimize advanced journeys of your app.
+            // For example:
+            // 1. Wait until the content is asynchronously loaded
+            // 2. Scroll the feed content
+            // 3. Navigate to detail screen
+
+            // Check UiAutomator documentation for more information how to interact with the app.
+            // https://d.android.com/training/testing/other-components/ui-automator
+        }
+    }
+}

baseline-profiles/src/main/java/eu/krzdabrowski/starter/baselineprofiles/StartupBenchmarks.kt

@@ -0,0 +1,75 @@
+package eu.krzdabrowski.starter.baselineprofiles
+
+import androidx.benchmark.macro.BaselineProfileMode
+import androidx.benchmark.macro.CompilationMode
+import androidx.benchmark.macro.StartupMode
+import androidx.benchmark.macro.StartupTimingMetric
+import androidx.benchmark.macro.junit4.MacrobenchmarkRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+/**
+ * This test class benchmarks the speed of app startup.
+ * Run this benchmark to verify how effective a Baseline Profile is.
+ * It does this by comparing [CompilationMode.None], which represents the app with no Baseline
+ * Profiles optimizations, and [CompilationMode.Partial], which uses Baseline Profiles.
+ *
+ * Run this benchmark to see startup measurements and captured system traces for verifying
+ * the effectiveness of your Baseline Profiles. You can run it directly from Android
+ * Studio as an instrumentation test, or run all benchmarks for a variant, for example benchmarkRelease,
+ * with this Gradle task:
+ * ```
+ * ./gradlew :baseline-profiles:connectedBenchmarkReleaseAndroidTest
+ * ```
+ *
+ * You should run the benchmarks on a physical device, not an Android emulator, because the
+ * emulator doesn't represent real world performance and shares system resources with its host.
+ *
+ * For more information, see the [Macrobenchmark documentation](https://d.android.com/macrobenchmark#create-macrobenchmark)
+ * and the
+ * [instrumentation args documentation](https://d.android.com/topic/performance/benchmarking/macrobenchmark-instrumentation-args)
+ **/
+@RunWith(AndroidJUnit4::class)
+class StartupBenchmarks {
+
+    @get:Rule
+    val rule = MacrobenchmarkRule()
+
+    @Test
+    fun startupCompilationNone() =
+        benchmark(CompilationMode.None())
+
+    @Test
+    fun startupCompilationBaselineProfiles() =
+        benchmark(CompilationMode.Partial(BaselineProfileMode.Require))
+
+    private fun benchmark(compilationMode: CompilationMode) {
+        // The application id for the running build variant is read from the instrumentation arguments.
+        rule.measureRepeated(
+            packageName = InstrumentationRegistry.getArguments().getString("targetAppId")
+                ?: throw IllegalArgumentException("targetAppId not passed as instrumentation runner arg"),
+            metrics = listOf(StartupTimingMetric()),
+            compilationMode = compilationMode,
+            startupMode = StartupMode.COLD,
+            iterations = 10,
+            setupBlock = {
+                pressHome()
+            },
+            measureBlock = {
+                startActivityAndWait()
+
+                // Add interactions to wait for when your app is fully drawn.
+                // The app is fully drawn when Activity.reportFullyDrawn is called.
+                // For Jetpack Compose, you can use ReportDrawn, ReportDrawnWhen and ReportDrawnAfter
+                // from the AndroidX Activity library.
+
+                // Check the UiAutomator documentation for more information on how to
+                // interact with the app.
+                // https://d.android.com/training/testing/other-components/ui-automator
+            },
+        )
+    }
+}

basic-feature/build.gradle.kts

@@ -14,7 +14,7 @@ android {
     namespace = "eu.krzdabrowski.starter.basicfeature"
 
     with (defaultConfig) {
-        minSdk = 24
+        minSdk = 26
         targetSdk = 34
     }
 
@@ -33,10 +33,6 @@ android {
         }
     }
 
-    compileOptions {
-        isCoreLibraryDesugaringEnabled = true
-    }
-
     composeOptions {
         kotlinCompilerExtensionVersion = libs.versions.compose.compiler.get()
     }
@@ -83,7 +79,5 @@ dependencies {
     ksp(libs.hilt.compiler)
     kspAndroidTest(libs.test.android.hilt.compiler)
 
-    coreLibraryDesugaring(libs.desugar)
-
     detektPlugins(libs.detekt.compose.rules)
 }

build.gradle.kts

@@ -1,6 +1,8 @@
 plugins {
     alias(libs.plugins.android.application) apply false
     alias(libs.plugins.android.library) apply false
+    alias(libs.plugins.android.test) apply false
+    alias(libs.plugins.baseline.profile) apply false
     alias(libs.plugins.detekt)
     alias(libs.plugins.hilt) apply false
     alias(libs.plugins.junit) apply false

core/build.gradle.kts

@@ -13,7 +13,7 @@ android {
     namespace = "eu.krzdabrowski.starter.core"
 
     with (defaultConfig) {
-        minSdk = 24
+        minSdk = 26
         targetSdk = 34
     }