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.claude/agent-memory/java21-android-legacy-builder/gradle_build_config.md

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+---
+name: Gradle Build Configuration
+description: Gradle build files for Java 21 + API 18 with desugaring support
+type: reference
+---
+
+# Gradle Build Configuration
+
+Migrated from Maven to Gradle due to SDK compatibility issues.
+
+## Key Files
+
+### settings.gradle
+```gradle
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://repo.maven.apache.org/maven2' }
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://repo.maven.apache.org/maven2' }
+    }
+}
+
+rootProject.name = "Helldivers2App"
+include ':app'
+```
+
+### build.gradle (Root)
+```gradle
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://repo.maven.apache.org/maven2' }
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.2.0'
+    }
+}
+
+plugins {
+    id 'com.android.application' version '8.2.0' apply false
+}
+```
+
+### app/build.gradle
+```gradle
+android {
+    namespace 'com.helldivers.app'
+    compileSdk 28
+
+    defaultConfig {
+        applicationId "com.helldivers.app"
+        minSdk 18
+        targetSdk 21
+        versionCode 1
+        versionName "1.0"
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_21
+        targetCompatibility JavaVersion.VERSION_21
+        coreLibraryDesugaringEnabled true
+    }
+
+    java {
+        toolchain {
+            languageVersion = JavaLanguageVersion.of(21)
+        }
+    }
+}
+
+dependencies {
+    implementation 'com.google.android:android:4.1.1.4'
+    implementation 'com.google.zxing:core:3.5.2'
+    implementation 'com.google.zxing:android-core:3.3.0'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
+}
+```
+
+## Compile Commands
+
+```bash
+# Debug APK
+.\gradlew clean assembleDebug
+
+# Install to device
+.\gradlew installDebug
+
+# Output: app/build/outputs/apk/debug/app-debug.apk
+```
+
+**Why:** Maven had issues with Android SDK path resolution. Gradle wrapper provides more reliable builds across different environments.
+
+**How to apply:** Use `gradlew.bat` for all builds. Set JAVA_HOME to JDK 21 before running.