When I was writing a control.
There is a class subViewPager that inherits ViewPager. I need to use the getCurrentItem() method of this ViewPager in another place. , which means to obtain a certain coordinate of this control.

But because my ViewPager is for special effects, the coordinates returned by its getCurrentItem() may exceed the length of my data collectionsize ,

For example, the length of my data collection is size = 1024
and getCurrentItem() returns 40280

So when I call him actively, I hope that he can return to me the result of coordinates %=size: 4028 24.

At the same time, his getCurrentItem() method should return a number like 40280 when called by the system.

My original approach was to write a special method to obtain the result after %=size. Force it when you need to get this parameter.

Later I changed a bit and used new Exception().getStackTrace(); to obtain the call stack information to determine whether the method was called by the specified class. This eliminates the need to force and write a subclass-specific method.

But this approach will generate a lot of garbage memory and frequently cause GC, so consider using the first method to deal with it.
But forced transfer is always a bit unpleasant, and it feels like there is no reusability. (Although it is because of the bad code... and the reusability of subViewPager is also reduced by doing this) So I want to ask if there is any way to make the same method be called in different classes. Can you perform different operations gracefully?