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Maybe worth a look for you: https://github.com/orfjackal/retrolambda

AFAIK they still don't support all of Java 7 so...

They support "parts" of java7, but not everything.

You can use most of Java 7 but not the new dynamic stuff. I'm told that lamdas will require this feature so we won't be getting that for a while.

This is total speculation, but they're also moving away from the DalvikVM to the new ART runtime. I'm hoping that they're keeping Java 8 in mind as that gets implemented.

They added support for try-with-resources in KitKat, maybe they will continue to add support for new Java features in newer versions?

Apparently Android is not using Java, but something that looks like Java. I bet Google vs. Oracle trial can be attributed to that. :)

Actually they use Java the language, except that the code doesn't run on JVM but on a different VM (Dalvik at this time). Dalvik supports Java 6 and parts from Java 7.

Dalvik is dead. Art is the new king

Maybe in the future, I doubt anyone, except Android developers, even knows about Art.

Art is still experimental and not enabled by default.