It seems this project didn't compelete

[Greensue]

Hey, man I'm very grateful for what you've done in this project, I'm learning how to hook a android method, I run your project in android studio, It seems did not complete, and I am confused about this code: (which is in method CallTest of TrackSysCall.java )
process = Runtime.getRuntime().exec(new String[]{"/system/bin/sh", "-c", "su -c 'andro" + propid + " & sleep 5'"}); can you explan what the command "/system/bin/sh", "-c", "su -c 'andro" + propid + " & sleep 5'" means.

Thanks a lot.