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kotlinlang

I have a question regarding paging in an app I've inherited as part of a team.  We're still learning a lot about it (and about Kotlin).  The app uses  androidx.viewpager.widget.ViewPager and androidx.viewpager.widget.ViewPager.OnPageChangeListener to handle swiping left and right to switch pages.  What I need to do is check a variable on the new page before the page is rendered so that I can make an ImageView visibile or invisible based on that variable when the page renders.  Can somebody help me with the order in which these objects call functions so I know where to place my boolean checks and change the visiblity?