APG 9.0.0 migration

[mmathieum]

• Android Gradle plugin 9.0.0 (January 2026)
• Migrate to built-in Kotlin

---

• update https://github.com/Triple-T/gradle-play-publisher/releases to 4.0.0+ when available
• update AndroidX Room? <- NOT, not the issue
• Kotlin-JVM still needed? <- YES for java-library

---

Related:

• Build failure: AGP 9.0.0 compatibility issue google/protobuf-gradle-plugin#793
• Cannot cast error when using AGP 9.0.0-alpha03 or later google/protobuf-gradle-plugin#787
• Finalize bump agp 9.0 (enable newDsl) android/nowinandroid#2054

[gemini-code-assist]

Summary of Changes

Hello @mmathieum, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a crucial upgrade of the project's build infrastructure by migrating to Android Gradle Plugin 9.0.0 and Gradle 9.1.0. This ensures the project remains compatible with the latest Android development tools and benefits from recent performance enhancements and features. The changes also include updating key dependencies and adapting the Kotlin compiler configuration within the build scripts to conform to the updated Gradle DSL.

Highlights

• Android Gradle Plugin (AGP) Upgrade: The Android Gradle Plugin has been updated from version 8.13.2 to 9.0.0, aligning the project with the latest Android build system capabilities and requirements.
• Gradle Wrapper Update: The Gradle wrapper has been upgraded to use Gradle 9.1.0, bringing improvements and compatibility with the new AGP version.
• Kotlin Compiler Options Refactoring: The syntax for configuring Kotlin compiler options in build.gradle files has been modernized, moving from kotlinOptions { ... } within compileKotlin or android blocks to a unified kotlin { compilerOptions { ... } } block.
• Dependency Updates: The Hilt dependency has been updated from 2.57.2 to 2.59, and Chucker from 4.2.0 to 4.3.0.
• Build Configuration Adjustments: The kotlin-android plugin alias has been removed from various build.gradle files as it's often implicitly handled or no longer explicitly required with newer AGP/Kotlin versions. Additionally, android.newDsl=false was added to gradle.properties for AGP 9.0 compatibility.

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[gemini-code-assist]

Code Review

This pull request correctly migrates the project to Android Gradle Plugin 9.0.0 and Gradle 9.1. It updates the necessary dependencies and build script syntax. I've found one critical issue with the Gradle wrapper URL that will break the build, and a minor suggestion to improve the clarity of dependency versioning. Overall, a good update once the critical issue is fixed.