For the More Curious: How ViewPager Really Works
The ViewPager and PagerAdapter classes handle many things for you behind the scenes. This section will supply more details about what is going on back there.
A caveat before we get into this discussion: you do not need to understand the nitty-gritty details in most cases.
But if you need to implement the PagerAdapter interface yourself, you will need to know how the ViewPager-PagerAdapter relationship differs from an ordinary RecyclerView-Adapter relationship.
When would you need to implement the PagerAdapter interface yourself? When you want ViewPager to host something other than Fragments. If you want to host normal View objects in a ViewPager, like a few images, you implement ...
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