build: apply the AGP 9 config migrations that already work on AGP 8

baselineprofile/build.gradle.kts

@@ -1,7 +1,5 @@
 @file:Suppress("UnstableApiUsage")
 
-import com.android.build.api.dsl.ManagedVirtualDevice
-
 plugins {
     alias(libs.plugins.android.test)
     alias(libs.plugins.kotlin.android)
@@ -52,8 +50,8 @@ android {
     // This code creates the gradle managed device used to generate baseline profiles.
     // To use GMD please invoke generation through the command line:
     // ./gradlew :examples:paywall-tester:generateBaselineProfile
-    testOptions.managedDevices.devices {
-        create<ManagedVirtualDevice>("pixel6Api34") {
+    testOptions.managedDevices.localDevices {
+        create("pixel6Api34") {
             device = "Pixel 6"
             apiLevel = 34
             systemImageSource = "aosp"

build-logic/convention/src/main/kotlin/com/revenuecat/purchases/android/buildlogic/convention/ConfigureAndroidLibrary.kt

@@ -29,18 +29,25 @@ internal fun Project.configureAndroidLibrary() {
 
         defaultConfig {
             minSdk = obtainMinSdkVersion()
-            targetSdk = targetSdkVersion
             testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
             consumerProguardFiles("consumer-rules.pro")
+            // AGP 9 defaults this to compileSdk, tightening the published floor from 1 to 36.
+            aarMetadata.minCompileSdk = 1
         }
 
+        // AGP 9 removes targetSdk from a library's defaultConfig.
         testOptions {
+            targetSdk = targetSdkVersion
             unitTests.isIncludeAndroidResources = true
             unitTests.all {
                 it.maxHeapSize = "1024m"
             }
         }
 
+        lint {
+            targetSdk = targetSdkVersion
+        }
+
         compileOptions {
             sourceCompatibility = JavaVersion.VERSION_1_8
             targetCompatibility = JavaVersion.VERSION_1_8

examples/purchase-tester/build.gradle.kts

@@ -55,11 +55,11 @@ android {
         getByName("release") {
             isMinifyEnabled = true
             proguardFiles(
-                getDefaultProguardFile("proguard-android.txt"),
+                getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro",
             )
             testProguardFiles(
-                getDefaultProguardFile("proguard-android.txt"),
+                getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-test-rules.pro",
             )
             signingConfig = signingConfigs.getByName("release")

integration-tests/build.gradle.kts

@@ -62,8 +62,8 @@ android {
     buildTypes {
         release {
             isMinifyEnabled = true
-            proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
-            testProguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            testProguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
             signingConfig = signingConfigs.getByName("release")
         }
     }

integration-tests/proguard-rules.pro

@@ -24,3 +24,11 @@
 # Needed due to robolectric update
 -dontwarn javax.lang.model.element.Modifier
 -dontwarn com.google.errorprone.annotations.IncompatibleModifiers
+
+# The app and androidTest APKs are minified separately but share a single classloader at
+# runtime, and the test APK links against the Kotlin runtime and AndroidX test plumbing that
+# ship inside the app APK. R8 optimization prunes whatever the app itself stops referencing,
+# so the runner dies with NoSuchMethodError/NoClassDefFoundError before any test executes.
+# This is an internal test app, so the size cost of keeping them does not matter.
+-keep class kotlin.** { *; }
+-keep class androidx.tracing.** { *; }