[Android plugin] How to call lua function from Java or C

Rickyngk

Dear all,

Have you ever call a lua function from Java or C, something like invoking a lua-event. Need help !

Regards,

ar2rsawseen

Well theoretically it's something like:

//get lua function lua_getglobal(L, "name_of_lua_function"); //pass parameters to function if any lua_pushstring(s); lua_pushstring(s); //call lua function //do the call (2 arguments, 1 result) lua_pcall(L, 2, 1, 0); //get result of function if any z = lua_tonumber(L, -1); //pop the returned result lua_pop(L, 1);

Rickyngk

In Java, I need to send a phone event to gideros. But, I did not have "L" at this time. How can I get it?

fxone

@Rickyngk I found sth like wrapper from JAVA to Lua. And as I see "CommonDataKinds_Phone" object is wrapped:
http://code.google.com/p/wrapandroid-for-multilanguage/
But it's for plain lua, unfortunately not for Gideros compiled lua files, I think.

ar2rsawseen

So about Java part, I think you need to define the existence of native method in java, and then define this method in C.
Here's an easy example how to do that:
http://stuf.ro/calling-c-code-from-java-using-jni/

And about calling lua event, then you can check an example from GoogleBilling Android plugin
File:
googlebillingbinder.cpp
Line: 164 void dispatchEvent(int type, void *event)

this method gets dispatch event object, creates new event object, dispatches event with values and handles response.

Rickyngk

I'm digging google billing plug-in. However, if someone has a simpler example, please support me!

Thank you in advance!

Rickyngk

Done, I've coded an init function in C, which called by Lua, for saving lua_state L once. After that, use the same way as @ar2rsawseen suggestion