Joannis Orlandos, writing on the Swift blog:

With the Swift SDK for Android, you can now start porting your Swift packages to Android. Over 25% of packages in the Swift Package Index already build for Android, and the Community Showcase now indicates Android compatibility.

The swift-java project enables you to interoperate between Java and Swift. It is both a library and a code generator, enabling you to integrate Swift and Java in both directions by automatically generating safe and performant bindings. To learn about generating bindings to bring your business logic to Android, check out the recent Swift Server Side meetup talk by Mads Odgaard.

This is a big deal, and one I know a lot of people have been waiting impatiently for. It took longer than expected, but is starting off with a really solid foundation.