如何在recyclerview中获取所选项目，何时在片段内？

Posted 2023-04-18

【中文标题】如何在recyclerview中获取所选项目，何时在片段内？

【英文标题】：How to Get the selected item in a recyclerview, when is within a fragment?

【发布时间】：2016-05-06 03:11:07

【问题描述】：

从当前fragment中，我想在recyclerview中获取选中项的位置，而不是在adapter中

现在我有两个recyclerview。 单击一个我想将我的数据发送到第二个，但是通过当前片段，因为这会生成附加数据

【参考方案1】：

已解决。 首先，重要的是创建一个包含函数的接口并在类片段中覆盖该函数。

示例

Cintasadapter [适配器] Cargas_detalle_previo [片段]

例如在适配器中创建一个接口 示例 CintasAdapter.java

 /// The interface
public interface getselectpos
    
        void onItemClick(CintasHolder holder, int posicion);
    

private getselectpos interfaceclick;
//Declared a private variable to manage the interface



//in the constructor recover the interface, for exemple.

//CintasDataset is a class to manage the data for the adapter

 public CintasAdapter(List<CintasDataset> items, getselectpos Interfaceclick)
    
        this.mitems = items; //the elements 
        this.interfaceclick=Interfaceclick; // the interface create from in the fragment
    




/// Class holder for this class , and implements OnClickListener

public class CintasHolder extends RecyclerView.ViewHolder implements View.OnClickListener
    
        public ImageView imagen; //an imagen
        public TextView modocorte;/a textview 

        public CintasHolder(View itemView)
        
            super(itemView);
            itemView.setOnClickListener(this);//add the listener for an element
        

        //add onClick and set the funcion onItemClick , declared in the interface
        @Override
        public void onClick(View view)
        
            interfaceclick.onItemClick(this, getAdapterPosition());
        
    

在片段中实现该接口

示例 Cargas_detelle_previo.java

//Cargas_detalle_previo is the fragment class, the interface  "CintasAdapter.getselectpos "
public class Cargas_detalle_previo extends Fragment  implements  CintasAdapter.getselectpos

    //TODO CONTENT
    //exemple for onViewCreated
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState)
    
        //TODO CONTENT
         List mitems2 = new ArrayList(); // for exemple 

        //declared the adapter
         final CintasAdapter adaptercintas = new CintasAdapter(mitems,this);
    



    //and  override the function in the interface, in the case  onItemClick
    @Override
    public void onItemClick(CintasAdapter.CintasHolder holder, int posicion)
    


        //and use the posicion 

        //exemple to show the posicion
        Toast.makeText(getContext(),posicion+"",Toast.LENGTH_LONG).show();


    

https://dzone.com/articles/programming-when-use http://beginnersbook.com/2013/05/java-interface/

抱歉我的英语不好

我的朋友告诉我检查java中的接口解决了这个问题，我希望它可以服务于其他人