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fix(android): migrate to Built-in Kotlin, stop applying KGP (#76) - #77
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…76) android/build.gradle applied the Kotlin Gradle Plugin unconditionally. On AGP 9, Flutter flags the plugin with a warning. With android.builtInKotlin=true, the build fails with "Failed to apply plugin 'kotlin-android'". Future Flutter versions make that failure unconditional. - Drop `apply plugin: "kotlin-android"` and `kotlinOptions`, and add kotlin.compilerOptions (jvmTarget 17). - Raise the Flutter floor from 3.27 to 3.44. That is the first Flutter that applies KGP to plugins itself; below it the Kotlin would not compile. The Dart floor is unchanged, because bumping it changes the formatter language version and would reformat 125 files. - Change kotlin-test to kotlin-test-junit. Without KGP, kotlin.test.Test no longer resolves. - Pin Robolectric to SDK 34. AGP 9 gives library tests targetSdk 36, which 4.12.2 rejects. - Move the example to AGP 9.1, Gradle 9.3.1 and builtInKotlin=true so CI covers the new path. Bump workmanager to ^0.10.9 and drop the unused kapt/serialization plugins. - CI pin (.fvmrc) goes from 3.41.9 to 3.47.5. The plugin's Kotlin class set is identical to 1.8.1 in these setups: - 3.47.5 on AGP 9, built-in Kotlin on and off - 3.47.5 on AGP 8 with root KGP - 3.44.0 on AGP 9 and on AGP 8 Guarded by test/unit/issue_76_builtin_kotlin_test.dart, which runs Flutter's detection regex over android/build.gradle.
…Robolectric pin comment (#76)
This was referenced Sep 23, 2026
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Fixes #76.
android/build.gradleapplied the Kotlin Gradle Plugin unconditionally. On AGP 9 Flutter flags the plugin with a warning, and withandroid.builtInKotlin=truethe build fails outright withFailed to apply plugin 'kotlin-android'.Changes
apply plugin: "kotlin-android"andkotlinOptions, and addedkotlin { compilerOptions { jvmTarget = JVM_17 } }.kotlin-testis nowkotlin-test-junit. Without KGP nothing substitutes the JUnit variant, sokotlin.test.Teststopped resolving.robolectric.properties. AGP 9 gives library unit tests targetSdk 36, which Robolectric 4.12.2 rejects.builtInKotlin=true, so CI builds the new path. Bumpedworkmanagerto ^0.10.9, dropped the unused kapt and serialization plugins, and moved the CI pin in.fvmrcfrom 3.41.9 to 3.47.5.Verification (local)
./gradlew testDebugUnitTest: 138 passed, 0 failed, the same as main's CI.flutter test test/unit/: 1233 passed. Security tests: 75 passed. Analyze: 0 issues.test/unit/issue_76_builtin_kotlin_test.dartruns Flutter's own KGP detection regex overandroid/build.gradle. It is red on main and green on this branch.The iOS jobs couldn't be checked locally. This PR is mainly here so CI verifies them under the new pin.