接口回调通过在adapter里面来实现；
下面是recyclerview的简单adapter：

package com.example.zhoukao_zidingyiyuan_moredownload.adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.zhoukao_zidingyiyuan_moredownload.R;
import com.example.zhoukao_zidingyiyuan_moredownload.bean.Bean;
import com.facebook.drawee.backends.pipeline.Fresco;
import com.facebook.drawee.interfaces.DraweeController;
import com.facebook.drawee.view.SimpleDraweeView;

import java.util.List;

/**
 * 作者：author
 * 时间 ：2017/11/18:10:32
 * 说明：
 */

public class RvAdapter extends RecyclerView.Adapter<RvAdapter.MyViewHolder> implements View.OnClickListener {
    Context context;
    List<Bean.DataBean> list;
    private OnItemClickListener mOnItemClickListener=null;
    public static interface OnItemClickListener{
        void onItemClick(View view,int positon);
    }
    public RvAdapter(Context context, List<Bean.DataBean> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view=LayoutInflater.from(parent.getContext()).inflate(R.layout.items,parent,false);
        MyViewHolder myViewHolder = new MyViewHolder(view);
        view.setOnClickListener(this);
        return myViewHolder;

    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        DraweeController controller= Fresco.newDraweeControllerBuilder()
                .setUri(list.get(position).getImage_url())
                .setAutoPlayAnimations(true)
                .build();
        holder.sdv.setController(controller);
        holder.tv.setText(list.get(position).getTitle());
        holder.itemView.setTag(position);
    }
    public void onClick(View v){
        if(mOnItemClickListener!=null){
            mOnItemClickListener.onItemClick(v,(int)v.getTag());
        }
    }
    public void  setOnItemClickListener (OnItemClickListener listener)  {
        this.mOnItemClickListener=listener;
    }
    @Override
    public int getItemCount() {
        return list==null?0:list.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder{
        SimpleDraweeView sdv;
        TextView tv;
        public MyViewHolder(View itemView) {
            super(itemView);
            sdv=itemView.findViewById(R.id.sdv);
            tv=itemView.findViewById(R.id.tv);
        }
    }
}

在activity里面可以实现点击条目的接口回调

rvAdapter.setOnItemClickListener(new RvAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int positon) {
                String urlmovie = list.get(positon).getVedio_url();
                Toast.makeText(MoreActivity.this,urlmovie,Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(MoreActivity.this,DownloadActivity.class);
                intent.putExtra("urlmovie",urlmovie);
                startActivity(intent);

            }
        });