I can't hook static call to System.loadLibrary (Android)

[ErnestoRG95]

I'm trying to hook an early static call in the main activity:

public class MainActivity extends c {
    private CodeCheck m;

    static {
        System.loadLibrary("foo");
    }

    public MainActivity() {
        super();
    }
. . .

with this hook :

. . .
var rt = Java.use("java.lang.Runtime");
rt.loadLibrary.overload('java.lang.String','java.lang.ClassLoader').implementation = function(arg, arg2){
		send("hooking loadLibrary")
		this.loadLibrary(arg , arg2);
	}
. . .

I know that the call is System and I'm hooking Runtime, but System actually calls Runtime.

In spite of my attempts frida does not make the hook and does not print "hooking loadLibrary".
Someone can help me?
Thank you.