skills/ HoangNguyen0403/agent-skills-standard

android-agp-upgrade

Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.

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AGP 9 Upgrade Workflow

Priority: P1 (HIGH)

Step-by-step workflow for upgrading an Android project to AGP 9.

Prerequisites

  • Check current AGP version. If below 8.x, recommend running the AGP Upgrade Assistant in Android Studio first.
  • Do NOT use this skill for Kotlin Multiplatform (KMP) projects.
  • Verify Gradle, JDK, and Kotlin version compatibility with AGP 9 release notes.

Step 1: Update dependencies

  • If KSP (com.google.devtools.ksp) is used, ensure version 2.3.6+.
  • If Hilt is used, ensure version 2.59.2+.
  • Update AGP to the latest stable 9.x version in the project's build files.

Step 2: Migrate to built-in Kotlin

AGP 9 includes built-in Kotlin support — the org.jetbrains.kotlin.android plugin is no longer needed.

See migration guide for detailed steps.

Step 3: Migrate to the new AGP DSL

AGP 9 introduces a new DSL for android {} blocks. Key changes include namespace handling, build type configuration, and source set declarations.

See DSL migration for before/after examples.

Step 4: Migrate kapt to KSP or legacy-kapt

If the project uses kapt:

  • Prefer migrating to KSP where annotation processors support it (Room, Hilt, Moshi).
  • For processors without KSP support, use legacy-kapt as a bridge.

Step 5: Update BuildConfig

If any module uses custom BuildConfig fields, update to the new AGP 9 syntax.

Step 6: Clean up gradle.properties

Remove these flags after migration:

  1. android.builtInKotlin
  2. android.newDsl
  3. android.uniquePackageNames
  4. android.enableAppCompileTimeRClass

Guidelines

  • Never write or run Python scripts for build migration.
  • Never add android.disallowKotlinSourceSets=false to gradle.properties.
  • Do not run clean task when verifying — it wastes time.

Verification

  1. ./gradlew help succeeds.
  2. ./gradlew build --dry-run succeeds.
  3. Gradle IDE sync succeeds.

References

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