具体实现Item中的某一个Button监听，而不是整个item的监听

• 首先在自定义Adapter中进行Button监听，以及传递一个回调接口（用于具体的动作）

定义一个回调接口

       public interface OnItemClickListener {
          void onItemClick(int position, View v);
       }

在自定义Adapter类的操作

获得从外部传入的回调接口

       public void setOnItemClickListener(OnItemClickListener onItemClickListener){
            this.mOnItemClickListener = onItemClickListener;
      }

在ViewHolder中设置Button监听，并且调用回调函数

       static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
          OnItemClickListener mOnItemClickListener;
          Button btn;
          public ViewHolder(View view){
             super(view);
            cardView = (CardView)view;
            btn.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
            if(mOnItemClickListener != null){
                mOnItemClickListener.onItemClick(getAdapterPosition(),v);
            }
        }
    }

绑定adapter与viewholder的OnItemClickListener

       public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          if(mContext == null){
            mContext = parent.getContext();
        }
        view = LayoutInflater.from(mContext).inflate(R.layout.goods_item,parent,false);
        ViewHolder viewHolder = new ViewHolder(view);
        viewHolder.mOnItemClickListener = mOnItemClickListener;
        return viewHolder;
    }

• 在activity中创建一个具体的回调函数类，并传入给adapter

      adapter.setOnItemClickListener(onItemClickListener);
      recyclerView.setAdapter(adapter);

       private OnItemClickListener onItemClickListener = new OnItemClickListener() {
          @Override
          public void onItemClick(int position, View v) {
           if(v.getId() == R.id.button){
              //具体的动作
          }
        }
      };

结束了，第一次写，写得不好多多包涵