RecyclerView的插入，删除，替换

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首先设置recyclerView动画

mRecyclerView.setItemAnimator(new DefaultItemAnimator());

然后在Adapter中定义三个方法

   public void remove(int position) {
        list.remove(position);
        notifyItemRemoved(position);
        //刷新下标，不然下标就重复
        notifyItemRangeChanged(position, list.size());
    }

    public void add(int position, String data) {
        list.add(position, data);
        notifyItemInserted(position);
        //刷新下标，不然下标就不连续
        notifyItemRangeChanged(position, list.size());
    }

    public void change(int position, String data) {
        list.set(position, data);
        notifyItemChanged(position);
    }