Navigation Using ViewPager2 Without Fragments

Question

I am attempting to use a ViewPager2 to allow the user to navigate between screens by swiping. Each screen is an XML Layout that is included using an include tag for which I set the visibility. I know how to use ViewPager2 for collections, but I simply want to set the visibility of a screen (a View, usually a GridLayout) to gone or visible (or possibly some additional miscellaneous actions) when the user swipes. I do not want to recycle or regenerate any items, because I am not navigating through a collection, I just want to be notified when the user swipes. However, because ViewPager2 is based on RecyclerView, it forces me to use RecyclerView.Adapter and create a RecyclerView.ViewHolder. All navigation examples I could find attempt to use Fragments. How can I simply be notified when the user swipes?

Answer 1

Hello,

If you want to detect the scroll event in ViewPager2, you can RegisterOnPageChangeCallbackin the ViewPager2 with viewpager2.RegisterOnPageChangeCallback(new MyViewPagerChange());, then override the OnPageSelectedand OnPageScrolled like following code.

internal class MyViewPagerChange : ViewPager2.OnPageChangeCallback    {        
		public override void OnPageSelected(int position){            
				base.OnPageSelected(position);        
        }        
         public override void OnPageScrolled(int position, float positionOffset, int positionOffsetPixels)                           {            
                base.OnPageScrolled(position, positionOffset, positionOffsetPixels);        
        }    
}

Best Regards,

Leon Lu

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