RecyclerView滚动到指定位置

private void moveToPosition(int position) {
        if (position >= 0) {
            mLayoutManager.scrollToPositionWithOffset(3, 0);
        }
    }

mTopSmoothScroller = new TopSmoothScroller(getActivity());


private void smoothScroll(int position) {
        mRecyclerView.postDelayed(new Runnable() {
            @Override
            public void run() {
                if (!isDetached() && position >= 0 && getActivity() != null && mTopSmoothScroller != null) {
                    mTopSmoothScroller.setTargetPosition(position);
                    mLayoutManager.startSmoothScroll(mTopSmoothScroller);
                }
            }
        }, 0);
    }

public class TopSmoothScroller extends LinearSmoothScroller {

    public TopSmoothScroller(Context context) {
        super(context);
    }

    @Override
    protected int getHorizontalSnapPreference() {
        return SNAP_TO_START;//具体见源码注释
    }

    @Override
    protected int getVerticalSnapPreference() {
        return SNAP_TO_START;//具体见源码注释
    }
}

scrollBy(int x, int y)

scrollToPosition(int position)