Check when smoothScrollToPosition has finished

Question

I would like to check when smoothScrollToPosition has finished scrolling back to the first item of recyclerview. I tried doing it like this which only works while smoothScrollToPosition is still scrolling:

recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,new RecyclerView.State(), 0);
if (!recyclerView.getLayoutManager().isSmoothScrolling()) {
    Log.d(TAG, "Scrolling has ended.");
} 

Answer 1

I use onScrollStateChanged(RecyclerView recyclerView, int newState) method for tracking scrolling state. The method to initiate scroll looks like this:

private void scrollToPosition(int position){
    recyclerView.removeOnScrollListener(onScrollListener);
    recyclerView.addOnScrollListener(onScrollListener);
    recyclerView.smoothScrollToPosition(position);
}

And here is the listener:

RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
       @Override
       public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
           switch (newState) {
               case SCROLL_STATE_IDLE:
                   //we reached the target position
                   recyclerView.removeOnScrollListener(this);
                   break;
           }
       }
   };

So, when recyclerView reaches SCROLL_STATE_IDLE, that means it has finished scrolling. Don't forget to remove listener in this state, so it won't trigger on the next scroll.