It's hardly as easy as that to invalidate a patent as a patent on an "idea". A trivial exception to this is standards-essential patents, which you could work around but can't if you want to maintain interoperability.

This case is similar, except the standards here are not really mandatory... unless you want to officially be known as a Java implementation: the patents appear to be intimately tied to optimizations and execution of Java bytecode. Android re-implements its own VM, but the bytecode it uses as an intermediate compilation step is perfectly spec-compliant. One way to work around that would be to compile Java directly to assembly, but of course, writing an optimizing compiler as good as the ones already out there is no trivial task. Seems much easier, instead, to just use optimized bytecode and translate to ARM assembly.

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