Android :: Custom Checkable View?

I'm writing a little custom view which can be in two states : checked, not checked. According to the state it is in, it's background changes. Quite straightforward sort of behavior. My class extends FrameLayout and implements the Checkable interface.

In my toogle method I just calls the setChecked method with a boolean corresponding to the new state. My setChecked method simply sets a mChecked boolean and calls the refreshDrawableState method. Pressing the view should then toggle it back and forth between the states check, unchecked.

The background of the FrameLayout is given a StateListDrawable in which I've defined a drawable item for the following states: state_pressed, state_focused, state_checked=true, state_checked=false.

When I press my custom view, the background changes all right back and forth between the state_pressed=true and state_checked=false items. But state_checked=true is never called.