You must create a custom child class of HorizontalScrollView and modify onTouchEvent to intercept the touch event from the fragment if a horizontal swipe is detected.
It seems to be what you're going for as far as the horizontal scrolling/swiping goes, but it's alot less leg work. You basically provide a list of fragments/fragment layouts to your viewpager in your activity, and set your PageAdapter like you normally would. You can either reuse layouts, or create different layouts for each page in your pager.
You can check out this blog post for a little more clarity.
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