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Dropping support for Android KitKat

Summary

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Flutter's minimum supported Android version is now Lollipop (API 21). Beginning with Flutter's 3.22 stable release, Flutter will no longer work on devices running Android KitKat (API 19).

Context

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The context, purpose, and description of this deprecation can be found in the go/rfc-android-k-deprecation design document.

Migration guide

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Flutter developers targeting Android will need to increase the minSdkVersion in their build.gradle and AndroidManifest.xml files from 19 to at least 21.

Timeline

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In stable release: 3.22