agp-9-upgrade

## Migration guide See the [AGP 9 migration guide](references/android/build/releases/agp-9-0-0-release-notes.md) for the major changes, many breaking, in AGP 9 compared to AGP 8. ## Requirements If the user requests to update or migrate to AGP 9, first check the AGP version used in the project. If it is lower than 9, stop and ask the user to run the AGP Upgrade Assistant in Android Studio to update to the latest stable version of AGP, and confirm when done. The user may also request that this requirement be skipped; if this is the case, you should update the version of AGP to the latest stable version as part of the AGP 9 migration. See the [AGP 9 migration guide](references/android/build/releases/agp-9-0-0-release-notes.md) for how to do this. Each version of AGP has its own set of compatibilities with other tools, such as Gradle, JDK, and Kotlin. The release notes for each of these versions will include a **Compatibility** table indicating the minimum versions for these tools. Do not use this skill for KMP projects, as they are unsupported. ## Steps If AGP is already at 9 or higher, then do the following: ### Step 1: Update dependencies If KSP (`com.google.devtools.ksp`) is used in the project, ensure it is on version 2.3.6 or higher. If Hilt is used in the project, ensure it is on version 2.59.2 or higher. ### Step 2: Migrate to built-in Kotlin See [the guide](references/android/build/migrate-to-built-in-kotlin.md) for detailed information. ### Step 3. Migrate to the new AGP DSL See [the guide](references/android/build/releases/agp-9-0-0-release-notes.md) for detailed information. See also [gradle-recipes](references/recipes.md) for examples on how to migrate old code to code that is compatible with AGP 9 and the new DSL. ### Step 4. Migrate kapt to KSP or legacy-kapt If KSP (`com.google.devtools.ksp`) or kapt (`org.jetbrains.kotlin.kapt`) are used in the project, see [KSP, kapt, and legacy-kapt](references/ksp-kapt.md) for detailed migration steps. ### Step 5. BuildConfig If any Android module contains custom BuildConfig fields, see [BuildConfig](references/buildconfig.md) for detailed information. ### Step 6. Update gradle.properties After the migration, check gradle.properties. Remove the following flags: 1. android.builtInKotlin 2. android.newDsl 3. android.uniquePackageNames 4. android.enableAppCompileTimeRClass Additionally, delete all temporary files you've created. ## Guidelines - Never write or run python scripts. - Only search the Gradle dependency cache when inspecting external dependencies, and only as a last resort. - Never add `android.disallowKotlinSourceSets=false` to `gradle.properties`. - When verifying changes, don't run the `clean` task. This is a waste of time. ## Verification After migration, verify the following: 1. Gradle IDE sync succeeds. 2. `./gradlew help` succeeds. 3. `./gradlew build --dry-run` succeeds. ## Troubleshooting Paparazzi v2.0.0-alpha04 and lower versions have issues with AGP 9. See [references/paparazzi-gradle-9.md](references/paparazzi-gradle-9.md) for details.