android - How to scroll/hide a parent header view from a RecyclerView scroll in child FragmentPagerAdapter? -


sorry, title bit confusing. i've included wireframe of screen below.

a - framelayout acts header in activity , houses fragment

b - slidingtablayout fragmentpageradapter in c

c - fragmentpageradapter houses fragments recyclerviews (grids) layout

what want accomplish:

as user scrolls through grid recyclerview in c, want header scroll , hidden (similar material design toolbars being hidden on scroll). want tabs in b locked on top of screen once hidden think part follow consequence of accomplishing scroll/hide on a.

ideally, i'd smooth scroll matches distance of user's scroll. backup plan have slide-up animation in fragment that's triggered scroll magnitude in c fragment (the trigger sent through c's fragment listener interface - parent activity).

enter image description here


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