The long saga of Oracle’s copyright-infringement against Google, which
copied much of the Java API for use in Android, has come to an end with this
ruling [PDF] in favor of Google. “Google’s purpose was to create a
different task-related system for a different computing environment
(smartphones) and to create a platform—the Android platform—that would help
achieve and popularize that objective. The record demonstrates numerous
ways in which reimplementing an interface can further the development of
computer programs. Google’s purpose was therefore consistent with that
creative progress that is the basic constitutional objective of copyright
itself.“

Source: LWN.net – US Supreme Court rules for Google over Oracle