如何将一个适配器之间的数据发送到另一个适配器？

Question

实际上，我有一个 Recyclerview，其中有一个按钮，并且（我从位置获得 id[来自 RestAPi 调用]）--->>当单击按钮时，我设置了另一个 recyclerview..现在我想从第一个 RecyclerviewAdapter。 我已经尝试过全局变量

这是图片enter image description here

Answer 1

根据我之前从另一个 question 得到的回答，我认为您需要一个 Singleton Pattern 而不是 全局变量

您只需要一个返回另一个Adapter's ArrayList<SingleItemModel> 的getter，但您将面临的问题是您需要与Activity 具有相同的Adapter 实例才能获得填充ArrayList<Model>。

一个好的解决方法是在Adapter 中使用 Bill Pugh 的 Singleton

public class Adapter {

private ArrayList<Model> list;

private Adapter() {}

public static Adapter getInstance() {
    return InstInit.INSTANCE;
}

// Don't forget to set the list (or NPE)
// because we can't argue with a Singleton
public void setList(ArrayList<Model> list) {
    this.list = list;
}

// You can now get the ArrayList
public ArrayList<Model> getList() {
    return list;
}

private static class InstInit {
    private static final Adapter INSTANCE = new Adapter();
}

// Some codes removed for brevity
// Overrided RecyclerView.Adapter Methods
.................

}

检索ArrayList 假设以下Adapters 是单例

AdapterOne a1 = AdapterOne.getInstance();
AdapterTwo a2 = AdapterTwo.getInstance();

ArrayList<Model> a1RetrievedList = a1.getList();
// You don't need to create a new instance
// creating a new instance doesn't make sense
// because you need to repopulate the list
// for the new instance.

ArrayList<Model> a2RetrievedList = a2.getList();
// You can also retrieve from AdapterTwo