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Listener 对象优化

Hello，我最近有看到这个Module，首先表示感谢。我提个对象复用的问题.

旧代码

    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
      if (holder instanceof BaseViewHolder){
          convert(mContext, holder, mDatas.get(position));
          ((BaseViewHolder) holder).mItemView.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  mItemClickListener.onItemClick(v,position-1);
              }
          });
          ((BaseViewHolder) holder).mItemView.setOnLongClickListener(new View.OnLongClickListener() {
              @Override
              public boolean onLongClick(View v) {
                  mLongItemClickListener.onLongItemClick(v,position-1);
                  return true;
              }
          });
      }
    }

新代码

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof BaseViewHolder) {
            ClickWrapper listener = null;
            if (holder.itemView.getTag() == null) {
                listener = new ClickWrapper(mItemClickListener, holder.getAdapterPosition());
                holder.itemView.setTag(listener);
            } else {
                Object tag = holder.itemView.getTag();
                if (tag instanceof ClickWrapper) {
                    listener = ( ClickWrapper) tag;
                    listener.position = holder.getAdapterPosition();
                }
            }
            holder.itemView.setOnClickListener(listener);
        }
    }

ClickWrapper

    public static class ClickWrapper implements View.OnClickListener {
        OnItemClickListener listener;
        int position;

        ClickWrapper(OnItemClickListener listener, int position) {
            this.listener = listener;
            this.position = position;
        }

        @Override
        public void onClick(View v) {
            listener.onItemClick(v, position);
        }
    }

这样可以极大的减少ClickListener对象创建的数量,减少内存的消耗。