可以使用scrollToPosition()

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

或smoothScrollToPosition()

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

要再次向上移动，您需要使用索引0调用上面的方法。但首先，您需要确保RecyclerView滚动到最后。因此，将ScrollListener放在RecyclerView上，以确保最后一项可见。

用这个。

int top = 0;
 recyclerView.smoothScrollToPosition(top); // for top

 int bottom = recyclerView.getAdapter().getItemCount()-1;
 recyclerView.smoothScrollToPosition(bottom);

如果你需要滚动项目回收视图到屏幕的中心时，为前。展开您的项目-使用这种方式：
在app/build.gradle中插入：

implementation 'com.andkulikov:transitionseverywhere:1.7.4'

当hadle点击适配器的onBindViewHolder- insert：

AutoTransition transitionPort = new AutoTransition();
                transitionPort.setDuration(100);
                transitionPort.addListener(new Transition.TransitionListener() {
                    @Override
                    public void onTransitionStart(@NonNull Transition transition) {
                        recyclerView.setEnabled(false);
                        recyclerView.setClickable(false);
                    }

                    @Override
                    public void onTransitionEnd(@NonNull Transition transition) {
                        recyclerView.post(() -> recyclerView.smoothScrollToPosition(position));
                        recyclerView.setEnabled(true);
                        recyclerView.setClickable(true);
                    }

                    @Override
                    public void onTransitionCancel(@NonNull Transition transition) {
                        recyclerView.setEnabled(true);
                        recyclerView.setClickable(true);
                    }

                    @Override
                    public void onTransitionPause(@NonNull Transition transition) {

                    }

                    @Override
                    public void onTransitionResume(@NonNull Transition transition) {

                    }
                });
                TransitionManager.beginDelayedTransition(recyclerView, transitionPort);

尝试其他事情后不工作？
这段出色的代码对我很有效

private void scrollToBottom(final RecyclerView recyclerView) {
    // scroll to last item to get the view of last item
    final LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    final RecyclerView.Adapter adapter = recyclerView.getAdapter();
    final int lastItemPosition = adapter.getItemCount() - 1;

    layoutManager.scrollToPositionWithOffset(lastItemPosition, 0);
    recyclerView.post(new Runnable() {
        @Override
        public void run() {
            // then scroll to specific offset
            View target = layoutManager.findViewByPosition(lastItemPosition);
            if (target != null) {
                int offset = recyclerView.getMeasuredHeight() - target.getMeasuredHeight();
                layoutManager.scrollToPositionWithOffset(lastItemPosition, offset);
            }
        }
    });
}

如果想跳到其他列表项&而不是last，可以修改行
final int lastItemPosition = adapter.getItemCount() - 1;
Source

如果有人在2023年寻找这个解决方案，这里有一种方法可以使用协程在Activity中实现滚动到某个索引。如果没有应用足够的延迟，无法正常工作的原因是，将列表更新到适配器和滚动回收视图的操作将并行进行，因此无法保证在将列表提交到适配器后进行滚动。

adapter.submitList(uiState.yourList) // using ListAdapter for better perfomance
 lifecycleScope.launch {
    delay(500)
    binding.rvNews.smoothScrollToPosition(INDEX_VALUE) // scrolls to the top for Index value 0
}