Detect start scroll and end scroll in recyclerview

Question

step 1 You can create a class extending RecyclerView.OnScrollListener and override these methods

public class CustomScrollListener extends RecyclerView.OnScrollListener {
    public CustomScrollListener() {
    }

    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        switch (newState) {
            case RecyclerView.SCROLL_STATE_IDLE:
                System.out.println("The RecyclerView is not scrolling");
                break;
            case RecyclerView.SCROLL_STATE_DRAGGING:
                System.out.println("Scrolling now");
                break;
            case RecyclerView.SCROLL_STATE_SETTLING:
                System.out.println("Scroll Settling");
                break;

        }

    }

    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        if (dx > 0) {
            System.out.println("Scrolled Right");
        } else if (dx < 0) {
            System.out.println("Scrolled Left");
        } else {
            System.out.println("No Horizontal Scrolled");
        }

        if (dy > 0) {
            System.out.println("Scrolled Downwards");
        } else if (dy < 0) {
            System.out.println("Scrolled Upwards");
        } else {
            System.out.println("No Vertical Scrolled");
        }
    }
}

step 2- Since setOnScrollListener is deprecated It is better to use addOnScrollListener

 mRecyclerView.addOnScrollListener(new CustomScrollListener());

See the documentation for onScrollStateChanged(int state). The three possible values are:

• SCROLL_STATE_IDLE: No scrolling is done.
• SCROLL_STATE_DRAGGING: The user is dragging his finger on the screen (or it is being done programatically.
• SCROLL_STATE_SETTLING: User has lifted his finger, and the animation is now slowing down.

So if you want to detect when the scrolling is starting and ending, then you can create something like this:

public void onScrollStateChanged(int state) {
    boolean hasStarted = state == SCROLL_STATE_DRAGGING;
    boolean hasEnded = state == SCROLL_STATE_IDLE;
}

Use this code for avoiding repeated calls

use -1 for detecting top

        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            if (!recyclerView.canScrollVertically(1) && newState==RecyclerView.SCROLL_STATE_IDLE) {
                Log.d("-----","end");

            }
        }
    });

Easiest way to do it is to pull out your layoutManager. For example

   private RecyclerView.OnScrollListener mListener = new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);

        GridLayoutManager layoutManager=GridLayoutManager.class.cast(recyclerView.getLayoutManager());
        int visibleItemCount = layoutManager.getChildCount();
        int totalItemCount = layoutManager.getItemCount();
        int pastVisibleItems = layoutManager.findFirstCompletelyVisibleItemPosition();

        if(pastVisibleItems+visibleItemCount >= totalItemCount){
            // End of the list is here.
            Log.i(TAG, "End of list");
        }
    }
}

Hope it helps!

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
   super.onScrollStateChanged(recyclerView, newState);
   if (!recyclerView.canScrollVertically(1) && newState == RecyclerView.SCROLL_STATE_IDLE) {
              //reached end
   }

   if (!recyclerView.canScrollVertically(-1) && newState == RecyclerView.SCROLL_STATE_IDLE) {
              //reached top
   }
   if(newState == RecyclerView.SCROLL_STATE_DRAGGING){
           //scrolling
   }
}