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Force devs to opt-in to built-in Kotlin in 3.50 #189235

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Force devs to opt-in to built-in Kotlin in 3.50#189235
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P2Important issues not at the top of the work listteam-androidOwned by Android platform teamtriaged-androidTriaged by Android platform team

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@jesswrd
jesswrd
opened on Jul 10, 2026

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The Flutter team has added support such that app and plugin developers can opt-in to built-in kotlin when they are completely migrated to built-in kotlin.

Use the migrator tool to set android.builtInKotlin=true. We force this and break unmigrated apps. Developers will be unable to opt-out of built-in kotlin in AGP 10.

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