Android is basically, as far as I've read, a Linux kernel, with Google's own user space on top of that--their own equivalent of libc and their own windowing system. On top of that, they run their own JVM, which they wrote themselves and which is NOT even compatible with Oracle's at the byte-code level. Android apps are written in Java and compiled/JITed for Google's VM.
So, unless the Java compiler itself takes code from Oracle's compiler, it is hard to see what in their would contain copies of Oracle code.