The problems between oracle and google are related to copyright and APIs. Androids OSS java bits are licensed differently(Apache license if I recall correctly) and technically a partially API compatible implementation of Java about 10 years ago with lots of Google specific additions and some code inherited from IBMs harmony project.

In any case, compiler technology has moved forward a lot and as Apple has been showing with IOS and Swift, you can do some pretty decent app ecosystem around native code without having to expose your developers to doing C/C++.