There has been a lot of talk lately about Swift support being added to Android, and a Pull Request has been merged into the main Swift branch adding and Android target.
Late last year Zhuowei Z mentioned on the Swift mailing list that he was working on a port, and posted his code to Github – which now with the help of modocache and many others has been added to the main Swift branch.
Android NDK 21 or greater is required.
You can find all the details over on this Github thread.
There is a lot of info in the thread on getting things working, and it looks like a great start for Swift on Android.