如何选择recyclerview中列出的所有项目? [英] How to select all items which listed in recyclerview?

问题描述

我在recyclerview中有项目列表，并且它们是可以选择的.

I have list of items inside of recyclerview, and they are multiple selectable.

我希望有一个选择按钮来全选，如果选择则取消全选.我没有看到通过RecyclerView.Adapter进行迭代的任何选项.我该如何实施?

I want to have select button to select all, and if selected deselect all. I didn't see any option to iterate through RecyclerView.Adapter to do that. How can I implement that?

谢谢.

推荐答案

尝试维护选定的项目列表和适配器中的项目列表，

Try to maintain Selected item list and list of items in Adapter,

选择全选"按钮时，只需将所有项目添加到所选项目列表中，然后调用notifyDataSetChanged

When you select "Select All" button, just add all item in selected item list and call notifyDataSetChanged

只需一个sudo代码

class adapter {
    ArrayList<Item> selected = new ArrayList<Item>();
    ArrayList<Item> items = new ArrayList<Item>();

    public void selecteAll() {
        selected.clear();
        selected.addAll(items);
        notifyDataSetChanged();
    }

    public void clearAll() {
        selected.clear();
        notifyDataSetChanged();
    }

    public void bindView() {
        Item item = items.get(position);

        if(selected.contains(item) {
            // Do selected action
        } else {
           // Non selecetd ctions
        }
    }

}

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