Android sticky header RecyclerView/ Section Header RecyclerView

public void onScrolled(int dx, int dy)

those are the two arguments that you're receiving onScrolled, that means, the number of pixels that the RecyclerView changed on the X and Y axis... so probably all you want to do is:

@Override
public void onScrolled(int dx, int dy) {
   if(dx < 0) // going up
      showSitckyHeader();
}

you can probably further improve this implementation by adding a minimum scroll amount. Something like:

int totalScrolled = 0;
@Override
public void onScrolled(int dx, int dy) {
   totalScrolled += dx;
   if(totalScrolled < MIN_SCROLL)
      showSitckyHeader();
   if(dx > 0)
      totalScrolled = 0;
}

@Override
public void onScrollStateChanged(int newState) {
   if(newState == SCROLL_STATE_IDLE || newState = SCROLL_STATE_SETTLING)
       totalScrolled = 0;
}

or even go further and implement speed, counting time, but those types of implementation are more tricky, and you have to test it yourself.

Since the previous answers don't provide a reliable solution, I propose my FlexibleAdapter library for RecyclerView, that is able to handle all following functionalities at once:

• Sticky functionality for headers with Sections, works with all 3 LayoutManagers and with ViewPager too.
• Selection Modes.
• Multiple item types with auto-mapping.
• Predefined ViewHolders.
• Expandable items with Selection Coherence.
• Draggable and Swipe-To-Dismiss.
• Animated Async Filter with spannable text.
• Scrolling Animations.
• EndlessScroll with Adapter binding.
• UndoHelper & ActionMode Helper.
• FastScroller.
• ...and more.

The idea behind is to avoid to create from scratch over again a custom Adapter for every project and to have more functionalities in one library, instead of relying on different libraries that support only 1 or 3 of them and that you cannot merge.