Jack didn't work properly with a lot of things, so Google just changed the approach. https://android-developers.googleblog.com/2017/03/future-of-java-8-language

Jack didn't work properly with a lot of things, so Google just changed the approach. https://android-developers.googleblog.com/2017/03/future-of-java-8-language-feature.html https://android-developers.googleblog.com/2017/03/future-of-...