The previous attempt opted out of AGP 9's built-in Kotlin (via
android.builtInKotlin=false + explicit kotlin-android plugin) because
the message from Gradle suggested it. But Kotlin 2.2.21's
kotlin-android plugin can't cast AGP 9's new ApplicationExtension to
the removed BaseExtension:
class ApplicationExtensionImpl$AgpDecorated_Decorated
cannot be cast to class com.android.build.gradle.BaseExtension
That suggestion is for projects with an older Kotlin toolchain. The
real fix:
- Kotlin 2.3.21 (latest stable; first line where kotlin-android also
supports AGP 9, but more importantly the built-in path works)
- KSP 2.3.8 — KSP PR #2674 (merged Oct 2025) added AGP 9 built-in
Kotlin support. KSP 1.x and pre-2.3 don't work with built-in Kotlin.
- Re-drop the kotlin-android plugin from both build.gradle.kts files;
AGP 9 enables built-in Kotlin by default and KSP 2.3 cooperates.
- Remove android.builtInKotlin=false from gradle.properties.
compose-compiler plugin tracks the Kotlin version via version.ref, so
no separate bump there.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hilt 2.52 referenced AGP's old BaseExtension which AGP 9 removed,
causing ktlintCheck to fail at plugin-application time:
Failed to apply plugin 'com.google.dagger.hilt.android'.
> Android BaseExtension not found.
Dagger/Hilt 2.59+ adds AGP 9 support (and mandates it for the Gradle
plugin path). 2.59.2 is the current latest.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Original 8.x toolchain choked on the ci-android image's JDK 25 with an
opaque "25.0.3" error in `ktlintCheck`; Gradle 8.10's JDK compat matrix
caps at 23. Modern chain:
- Gradle 9.1.0 (first to support JDK 25)
- AGP 9.0.1 (requires Gradle 9.1+, requires Kotlin 2.2.10+)
- Kotlin 2.2.21 / KSP 2.2.21-2.0.5 (latest 2.2.x line)
- Compose BOM 2026.05.01 (current; pulls ui-text-google-fonts at the
BOM-managed version, so the explicit pin was dropped)
AGP 9.0 breaking changes that affected us:
- `kotlin-android` plugin no longer needed — AGP 9 auto-enables via
`android.builtInKotlin=true` default. Removed alias from both the
root build.gradle.kts and :app/build.gradle.kts.
- `applicationVariants` API removed; we don't use it.
- Other defaults flipped (useAndroidx, uniquePackageNames, etc.) but
we already set them explicitly or weren't relying on the old defaults.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
M8 phase 1.4. Mirrors flutter_client/lib/theme/. Source of truth for hex
values is flutter_client/shared/fabledsword.tokens.json (manual sync until
cross-language codegen lands; ports the dark-surface + flat cohort).
Material 3 ColorScheme takes accent as primary; action colors
(Moss/Bronze/Oxblood) live in LocalActionColors as semantic roles per the
project_design_system rule "NEVER use accent for action buttons".
Typography uses androidx.compose.ui.text.googlefonts to fetch Fraunces /
Inter / JetBrains Mono at runtime via Play Services Fonts — matches the
Flutter client's `google_fonts` package (no bundled .ttf files in either
tree). Weights restricted to 400/500. Fraunces is reserved for ≥18sp
display/headline slots per the design-system rule.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
M8 phase 1.1: empty multi-project Gradle scaffold (root + :app
placeholder). Version catalog establishes pinned Kotlin/AGP/Compose/
Hilt/Room/Media3/etc. versions for the whole module.
Gradle wrapper (8.10) reused from flutter_client/ — the wrapper jar
is a bootstrap and respects distributionUrl from gradle-wrapper.properties.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen