Apples and oranges, Dave.
Google was unable to negotiate a suitable licensing agreement to use Java technologies on the Android platform. Their response to this was to create Dalvik. The effect here is that you compile your Java code, Dalvik re-compiles the compiled code so that it isn't "Java" anymore, and then runs it. Oracle claims that this process violates the Java licensing agreements or copyright.
MySQL (Community) is currently licensed under the GNU General Public License (v2) and as such can be forked at any time. If Oracle does decide to change the licensing on a future release, the current license will still apply to the versions previous to that. There are already several MySQL fork projects out there.
I am personally not a fan of Oracle's products or behavior, and am not defending them in the least, but knowledge is power!
To be on topic: Here's hoping at some point all the SQL gets abstracted away from developers so we can make a Postgres driver a reality 
