java - Android HorizontalScrollView Snap and Center Focus -

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fairly new android dev. trying create horizontalscrollview snaps , filters images based on centered object selected in list. in picture below, notice how letter in center of screen should perform set of specific commands. example, when scroll "c" popup message "c" should pop up.

i have created horizontalscrollview , populated view buttons. trying figure out how make snap , how identify letter in center @ given moment.

enter image description here

i have taken @ viewpager, don't think able have described because have set of letters displayed @ moment. understand have create custom class. provide guidance?


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