Parallax effect on each item in a recycler view?

I managed to get Parallax working with this library: https://github.com/yayaa/ParallaxRecyclerView

For anyone doing this themselves, it's still a good thing to play and see how it works.

Similar concept to my code but it actually works! haha.

You are on the right track. You have to use a ScrollListener. Furtermore, you have to access RecyclerViews LayoutManager and iterate over all items that are visible and set translateY according to the amount of pixels scrolled.

The things get a little bit more complicated, because you can't use recyclerView.getChildAt(pos) because LayoutManager is responsible to layout elements and they might be in different order in the LayoutManager than getChildAt(pos).

So the algorithm basically should look like this (pseudo code, assuming LinearLayoutManager is used):

for (int i = layoutManager.findFirstVisibleItemPosition(); i <= layoutmanager.findLastVisibleItemPosition; i++){

   // i is the adapter position

   ViewHolder vh = recyclerView.findViewHolderForAdapterPosition(i);
   vh.imageView.setTranslationY( computedParalaxOffset ); // assuming ViewHolder has a imageView field on which you want to apply the parallax effect
}