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.claude/agent-memory/java21-android-legacy-builder/galaxy_s3_build_config.md

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+---
+name: Galaxy S3 Build Configuration
+description: Java 21 toolchain configuration for Android API 18-21 with desugaring
+type: reference
+---
+
+## Working Configuration for Samsung Galaxy S3
+
+**Why:** Galaxy S3 has Android 4.3 (API 18) with 1GB RAM. Java 21 features need desugaring.
+
+**How to apply:**
+
+### build.gradle (app level)
+```gradle
+android {
+    namespace 'com.helldivers.app'
+    compileSdk 28
+
+    defaultConfig {
+        minSdk 18
+        targetSdk 21
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_21
+        targetCompatibility JavaVersion.VERSION_21
+        coreLibraryDesugaringEnabled true
+    }
+
+    java {
+        toolchain {
+            languageVersion = JavaLanguageVersion.of(21)
+        }
+    }
+}
+
+dependencies {
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
+}
+```
+
+### AndroidManifest.xml
+```xml
+<uses-sdk android:minSdkVersion="18" android:targetSdkVersion="21" />
+<application android:hardwareAccelerated="false">
+```
+
+### Key optimizations for 1GB RAM:
+- Use Theme.Holo instead of AppCompat
+- LinearLayout preferred over ConstraintLayout
+- RGB_565 for bitmaps
+- Disable hardware acceleration on problematic API 18
+- Minimize overdraw