So today with some help from the people on here I put together a simple android app that uses the ndk. I imported the eigen library right into the jni folder that I created
So this was something that got me started being able to pass values back and forth from java to c++ but here's a really great full fledged tutorial on the ndk
http://code.google.com/p/awesomeguy/wiki/JNITutorial
I picked up a bunch of stuff from there as well as this book
http://www.amazon.com/Android-Beginners-Guide-Sylvain-Ratabouil/dp/1849691525