android - RecyclerView中 我长按一个Itme 然后所有的Item 出现一个删除的小图标 这个怎么实现

Question

现在的问题是我长按了图标 只是单个item出现了 删除的小图片 而不是所有的 请问要怎么实现长按一个item 所有的itme 项都出现删除的小图片？

Answer 1

In the data object collection in the Adapter, set a variable to indicate whether the current item status is to display the delete small icon or not. When long pressing a single item, change the value of the deletion status variable of all data in the collection, and use notifyItemRangeChanged (0, the number of all items - 1) to notify RecyclerView that the status of all items has changed, and then trigger a re- Call onBindViewHolder, and display the icon based on whether the item displays the delete icon status.

Answer 2

The logic is written into bindView. When it needs to be changed, modify the flag value and notifyDataSetChanged

//伪代码如下
 public void onBindViewHolder(ViewHolder holder, int position){
        myIcon.setVisibility(showIcon ? View.VISIBLE : View.INVISIBLE);
    }