Android :: View On Press Onpress - Change Background Color On Press - How Do Show That The View Is Being Pressed

I have, for the time being, a custom view with a 9-patch image as a border.

That custom view is placed three times in a LinearLayout, so it looks like this:

+------------------------+
| CustomView |
+------------------------+
| CustomView |
+------------------------+
| CustomView |
+------------------------+

I have attached a click event listener to the View, so it is clickable. But then I click it, I cant see that I am clicking it - there is no change in color.

So, Im thought that I'd attach a "onPress" listener, and then change the background of the view but I couldnt find such a listener.

So, the question is - how do I create the behaviour on the View so I can see that it is being pressed? this is normally done in Android with a green background to indicate that it is now being pressed.