How to scroll recyclerView programmatically?

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You can use scrollToPosition()

recyclerView.post(new Runnable() {
    @Override
    public void run() {
        recyclerView.scrollToPosition(adapter.getItemCount() - 1);
        // Here adapter.getItemCount()== child count
    }
});

or smoothScrollToPosition()

recyclerView.post(new Runnable() {
    @Override
    public void run() {
        recyclerView.smoothScrollToPosition(adapter.getItemCount()- 1);
    }
});

To move up again, you need to call the above method with index 0. But first, you need to make sure that the RecyclerView is scrolled to last.
So, put a ScrollListener on RecyclerView to make sure the last item is visible.

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