feat: Adopt AGP v9

FabricExample/android/app/build.gradle

@@ -130,7 +130,7 @@ android {
             // see https://reactnative.dev/docs/signed-apk-android.
             signingConfig signingConfigs.release
             minifyEnabled enableProguardInReleaseBuilds
-            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
 
             // Detox-specific additions to pro-guard
             proguardFile "${rootProject.projectDir}/../node_modules/detox/android/detox/proguard-rules-app.pro"

FabricExample/android/gradle.properties

@@ -48,3 +48,8 @@ rnsDebugLogsEnabled=true
 
 # Use this property to enable V5-specific code
 rnsGammaEnabled=true
+
+# Opt out of built-in kotlin and new DSL behavior that ships with AGP 9.
+# Starting from AGP 10.x these opt outs will be removed.
+android.builtInKotlin=false
+android.newDsl=false

FabricExample/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-all.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

android/build.gradle

@@ -86,7 +86,22 @@ if (isRunningInContextOfScreensRepo()) {
     apply plugin: "com.facebook.react"
 }
 apply plugin: 'com.android.library'
-apply plugin: 'kotlin-android'
+
+def shouldEnableAgpFallback() {
+    def agpMajorVersion = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0].toInteger()
+    if (agpMajorVersion <= 8) {
+        return true
+    }
+
+    def propertyVal = providers.gradleProperty("android.builtInKotlin").orNull
+    def isBuiltInKotlinEnabled = propertyVal != null ? propertyVal.toBoolean() : true
+
+    return !isBuiltInKotlinEnabled
+}
+
+if (shouldEnableAgpFallback()) {
+    apply plugin: 'kotlin-android'
+}
 
 def reactNativeArchitectures() {
     def value = project.getProperties().get("reactNativeArchitectures")
@@ -170,16 +185,15 @@ android {
     }
     sourceSets.main {
         ext.androidResDir = "src/main/res"
-        java {
-            srcDirs += [
-                "src/fabric/java",
-            ]
+        kotlin {
+            directories.add("src/fabric/java")
         }
         res {
             if (safeExtGet(['compileSdkVersion', 'compileSdk'], rnsDefaultCompileSdkVersion) >= 33) {
-                srcDirs = ["${androidResDir}/base", "${androidResDir}/v33"]
+                directories.add("${androidResDir}/base")
+                directories.add("${androidResDir}/v33")
             } else {
-                srcDirs = ["${androidResDir}/base"]
+                directories.add("${androidResDir}/base")
             }
         }
     }

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists