Hm... It's pretty big task - to port ALL to Java. If they port only BOINC - it will be not enough to run anything. Each project should be ported too....
They actually ported SETI as well, but apparently haven't progressed much lately since they still call it pre-alpha. And IIRC they had sort of split into pure Java and Android variants.
It is an interesting branch, but of course only practical while a phone is on the charger, and even then I'd be concerned about heat since continuous computation is outside the intended purpose.
Joe