Recyclerview batch update view: notifyitemrangeinserted, notifyitemrangeremoved, notifyitemrangechanged

If recyclerview  Bound data , Suppose the data changes , We are usually ：

notifyDataSetChanged perhaps ：notifyItemChanged(int position)

But if there's too much data notifyDataSetChanged It will definitely consume some performance , If you update more than one at a time notifyItemChanged（） no way , This time we use recyclerview There is a batch update method notifyItemRangeChanged();

Recyclerview Local refresh function of ：

Refresh specified from specified location item,notifyItemRangeChanged(int,int);

increase 、 Delete 、 Modified local refresh ：

increase ：

notifyItemRangeInserted（int startPosition,int itemcount）

startPosition: The starting position , Where to insert data .

itemcount: The number of data .

Delete ：

notifyItemRangeRemoved（int startPosition,int itemcount）

Parameters and “ increase ” It's the same , But there is a point of attention ：

After calling this method, you need to call all the following data

notifyItemRangeChanged（startPosition,allCount-startPosition）;

Otherwise, there will be abnormal position .（ The specific reasons will be studied later ）

Change ：

Direct use notifyItemRangeChanged(int startPosition,int itemcount);