Using NDK to Call C code from Android Apps

Android NDK (Native Development Kit) allows working with native C code using a shared C library. It includes the entire toolchain needed to build for your target platform (ARM). Native C code accessible via JNI still runs inside the Dalvik VM, and as such is subject to the same life-cycle rules that any Android application lives by. The advantage of writing parts of your app code in native language is presumably speed in certain cases.



See more at Marko Gargenta's article.