如何在片段内获取Recyclerview中的选定项目？

Question

从当前片段，我想在recyclerview中获取所选项目的位置，但不是在适配器中

现在我有两个recyclerview。 单击一个我想将数据发送到第二个，但是按当前片段，因为这将生成adional数据

Answer 1

解决。 首先，创建一个包含函数的接口并在类片段中覆盖此函数非常重要。

为例

Cintasadapter [适配器] Cargas_detalle_previo [片段]

在适配器中为例子创建一个接口 为例 的 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

为例 的 Cargas_detalle_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/

抱歉我的英文不好

我解决了这个问题，朋友告诉我检查java中的接口，我希望它能为别人服务