Run precompiled app in android

My issue is that I need to run Stockfish within an android application. I have created the interface for it and need to have the stockfish engine running.

Stockfish has a precompiled android application to be included within my app. I should be able to pass messages to it using sysout. However, without anything in my code telling android to run the precompiled code, the engine won't do anything.

At least, this is my understanding of how the process works. Google hasn't helped much in finding ways to run another app inside an android project.

So, how do I get my android program to execute another precompiled app? Thanks