Set A Listener That Fires When My Viewflipper Shows New Child?

I have a viewflipper for which i want a listener to fire when the child displayed is changed. I have set an onfocuschangelistener to the viewflipper but it never fires when i flip from child 0 to child 1 or vice-versa. The viewflipper contains two relativelayouts and i have tried setting onfocuschangelisteners for those but i get a classcastexception when i try to set it. Here's my code.

R. Is. Song_page_layout is one of my relativelayouts and showpopup() is a function i use to show, well, popups.

Does anyone have working code for some sort of trigger that fires when a viewflipper changes which child is displayed?

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