Index of current active card issue

[purvimehta16]

For example first card green color, second card white color and third card yellow color . so first we swipe right .so now top view is white card after we swipe left so now top view is green card how can it possible? Also I want to get index of current card suppose current card is green then I am getting reference of second card white and not green ones that is current index of active card am not getting. How can I get index of current active card?