The dissent explains how Android fails three of the four fair use tests. I'm not sure what the majority was smoking when they wrote this, but far better examples of fair use exist, especially uses that are noncommercial and especially are noncompetitive with the original.

Java was a mobile OS before Android literally obliterated the market after copying Java. Arguably, if Android was fair use, everything is fair use and all software copyright is fundamentally defeated by this ruling.