Adding external SDK to Cocos2d-x like Chartboost

I am just wondering if anybody has any tips and tricks on how to go about adding an external SDK, like Chartboost, to Cocos2d-x.

Chartboost has both an Objective-C SDK for iOS and a Java SDK for Android.

How would I go about calling these SDK’s to display a fullscreen ad from different points within a Cocos2d-x project.

Thanks

There is some good discussion about this here:
http://www.cocos2d-x.org/boards/6/topics/11133