So I recently released a port of a cocos2d-iphone game to android using cocos2d-x, called Chirp Chirp.
As the iphone version used openfeint, I also integrated that too. Integrating highscores, anchievements and some buttons to access the OF dashboard and login a user was very easy - only about 5-6 JNI calls.
However, I wasn’t too happy with openfeint, as the iphone version has far more features than the android version. So today I updated the game to use scoreloop instead. The whole process of changing from one to the other took about a day.
You might find that the JNI code is the hardest part, as I foudn its not very well documented. However, it was easy enough to just see how cocos denshion does it, and copy that code.
You can download the game here: