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Is this usable in Android?

I don't think so. It will be awhile before Dalvik supports the new bytecodes in Java 8. I'd like to know how long though.

edit: or new bytecodes from Java 7 which will be required for Java 8 features

There's no new bytecodes in Java 8. Lambdas will compile down to invokedynamic calls (jdk7)

Which will be fine once Android starts supporting Java 7.

You can compile invokedynamic into reflection pretty easily. Obviously you lose the method call optimization, but you can keep the syntatic sugar.

I would be very surprised if the backports folks didn't offer this within a few months.