said by Nick D:I appreciate you bringing this up because the information is interesting to me. I didn't know Android was based on Linux, as pandora advised, and actually feel a little bit let down to learn this.
The kernel is Linux (or linux-like), but its APIs are all Java-based.
However, at least according to Wikipedia, its APIs are written in C:
Android consists of a kernel based on the Linux kernel 2.6 and Linux Kernel 3.x (Android 4.0 onwards), with middleware, libraries and APIs written in C and application software running on an application framework which includes Java-compatible libraries based on Apache Harmony.