Android :: How Can I Add Scripting To App?

I am searching for some method of extending Android application with scripting support. All I need is something similar to Lua's C api - I should be able to bind a few functions (classes not necessary) and run a script with a parameter to do some actions and produce result. Android api bindings are unnecessary (even unwanted for security reasons). I have searched this group and google for a lib like this, but no success. Sure there is Android Scripting Environment, but it runs Lua and Python normal interpreter as a separate C process. The Java port of Lua interpreter, which I could possibly compile for Android, doesn't seem to be ready yet, but I may be wrong. I have also looked at JRuby, which looks good except it is large and it may be hard to limit script's access to Java classes, or to set it up properly. Also, Android seems to have some Javascript interpreter (with Webkit) - maybe there is a way to use it inside app? So here is my question: How can I add scripting to my app?