public enum AndroidMinSdk

The Android API level an app runs on at the lowest.

A closed set rather than an int, because this is not an arbitrary number: it is the platform floor the build supports, the builder parses it and compares it against real thresholds – multidex below 21, Android Auto below 23 – and a level outside this range is a typo rather than a choice.

The build server raises it on its own where a feature demands more, so picking a low level here is a floor and not a promise: adding Android Auto to a project pinned at API_19 builds at 23.

A level not listed is not a dead end. The properties file takes codename1.arg.android.min_sdk_version unchanged, which is the escape hatch for a platform newer than this framework build knows about.