Question

Doe anyone know how to create a .jar file from one activity?
I don´t need anything else, just to create a .jar from the Activity class itself (I don’t need the .xml file).

is it possible?

Answer 1

You can create a new Android project which contains a class like:

public class ClassA extends Activity {
...
}

Be sure to create ONLY a class, no Android Activity. Then you can export a jar file of it.