react-native-community
Fresh project fails to build with Duplicate value for resource 'attr/actionBarSize'
Environment
System: OS: macOS 15.2 CPU: (8) arm64 Apple M3 Memory: 113.23 MB / 16.00 GB Shell: version: "5.9" path: /bin/zsh Binaries: Node: version: 20.12.2 path: ~/.nvm/versions/node/v20.12.2/bin/node Yarn: version: 1.22.22 path: /usr/local/bin/yarn npm: version: 10.5.0 path: ~/.nvm/versions/node/v20.12.2/bin/npm Watchman: version: 2025.05.26.00 path: /opt/homebrew/bin/watchman Managers: CocoaPods: version: 1.16.2 path: /Users/aryandev/.rbenv/shims/pod SDKs: iOS SDK: Platforms: - DriverKit 24.2 - iOS 18.2 - macOS 15.2 - tvOS 18.2 - visionOS 2.2 - watchOS 11.2 Android SDK: API Levels: - "29" - "31" - "34" - "35" Build Tools: - 31.0.0 - 34.0.0 - 35.0.0 System Images: - android-31 | Google APIs ARM 64 v8a - android-34 | Google Play ARM 64 v8a - android-35 | Google Play ARM 64 v8a - android-36 | Google Play ARM 64 v8a Android NDK: Not Found IDEs: Android Studio: 2024.3 AI-243.25659.59.2432.13423653 Xcode: version: 16.2/16C5032a path: /usr/bin/xcodebuild Languages: Java: version: 17.0.14 path: /opt/homebrew/opt/openjdk@17/bin/javac Ruby: version: 2.7.5 path: /Users/aryandev/.rbenv/shims/ruby npmPackages: "@react-native-community/cli": installed: 18.0.0 wanted: 18.0.0 react: installed: 19.0.0 wanted: 19.0.0 react-native: installed: 0.79.2 wanted: 0.79.2 react-native-macos: Not Found npmGlobalPackages: "react-native": Not Found Android: hermesEnabled: true newArchEnabled: true
Description
A brand new project, created with npx @react-native-community/cli init, fails to build for Android with a Duplicate value for resource 'attr/actionBarSize' error. This issue seems to be caused by a persistent, untraceable caching problem that survives standard cleaning procedures. We have attempted the following fixes, none of which resolved the issue: Forcing dependency versions for appcompat and material in build.gradle. Overriding actionBarSize in styles.xml. Cleaning the build (./gradlew clean). Stopping the Gradle daemon (./gradlew --stop). Completely deleting the Gradle cache (rm -rf ~/.gradle/caches). Completely deleting the android directory and regenerating it from a temporary project. The error persists through all of these steps, indicating a deep issue with the build process or caching mechanism. The error log references a temporary project name (com.recalltemp.app) even after the regenerated android directory has been configured with the correct project name, which strongly suggests a caching problem that is not being cleared by standard methods.
Reproducible Demo
Run npx @react-native-community/cli init MyTestApp cd MyTestApp Run npm run android Expected Behavior: The default application should build and run successfully on an Android emulator or device. Actual Behavior: The build fails during the :app:mergeDebugResources task with the Duplicate value for resource 'attr/actionBarSize' error.
