Toolbar 单击，Recyclerview 跳到顶部

代码示例

        mToolbar.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                RecyclerView.LayoutManager layoutManager = mRecyclerView.getLayoutManager();                if (layoutManager instanceof LinearLayoutManager) {                    LinearLayoutManager linearManager = (LinearLayoutManager) layoutManager;                    linearManager.scrollToPositionWithOffset(0, 0);                    linearManager.setStackFromEnd(true);                }            }        });