Migrate Android plugins to Flutter built-in Kotlin support

[aiviapp]

Flutter 3.44.4 reports that the latest Google ML Kit Flutter packages still apply the legacy Kotlin Gradle Plugin (KGP), which future Flutter versions will no longer support.

Verified latest affected releases:

• google_mlkit_commons 0.12.0
• google_mlkit_language_id 0.14.0
• google_mlkit_text_recognition 0.16.0

Their Android Gradle scripts unconditionally apply kotlin-android and configure kotlinOptions. The recent compileSdk 36 / AGP 9 compatibility changes do not yet migrate the plugins to AGP 9 built-in Kotlin.

Please follow Flutter's plugin-author migration guide:

https://docs.flutter.dev/release/breaking-changes/migrate-to-built-in-kotlin/for-plugin-authors

Observed warning:

Your app uses the following plugins that apply Kotlin Gradle Plugin (KGP): google_mlkit_commons, google_mlkit_language_id, google_mlkit_text_recognition

[bensonarafat]

Let me reproduce this @aiviapp

[fbernaly]

Could you send a PR with the needed changes?

[fbernaly]

@bensonarafat : is this resolved?

[bensonarafat]

@fbernaly cc: @aiviapp
I don't think we should do this right now
It will require we update the Flutter SDK minimum to 3.44 which will be a blocker to other users

[fbernaly]

we could release a new version and that will be the last developers using Flutter < 3.44 will use, and then release a subsequent version that will support Flutter 3.44 that will be the one we will maintain.
Could you guys comment on this plan?

[bensonarafat]

Okay, this plan works @fbernaly

[CharlieMacnamara]

Hi team, I'm a user of google_mlkit_commons and google_mlkit_face_detection who's following this issue. Thanks for the discussion about the release plan — the proposed approach (last version for Flutter < 3.44, then a new version with built-in Kotlin) sounds like a good way to handle this transition.

My app is currently pinned to AGP 9.x with android.builtInKotlin=false because of these dependencies. Just adding my voice to show community interest.

Happy to help test any pre-release versions if needed.