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.