Question

How can I detect if a new listener has been registered for any widget in my android app? Is there a place where I can intercept the listener when it’s being registered?

Answer 1

I may be misunderstanding but you could do something like:

public interface ListenerChangeListener { // Feel free to remove the redundancy :P
    public void listenerAdded(ListenerChangeEvent e);
    public void listenerRemoved(ListenerChangeEvent e);
}

And

public class ListenerChangeEvent extends AWTEvent // or other class {
    // Implementation
}

Finally, subclass your own custom widgets and modify the addXListener() and removeXListener() methods to fire your custom events if any have been added to the component. Then you just create your “Listener” class as per normal and implement your new Listener interface and so on.

It’s a bit long and drawn out, again, I may have misunderstood exactly what you were after.