@Override
 public void onBindViewHolder(BaseViewHolder holder, int position) {
   final UserDataHolder dataHolder = mDatas.get(position);
   final int itemViewType = dataHolder.getType();
   switch (itemViewType) {
     case 0:
       HeaderViewHolder userViewHolder = (HeaderViewHolder) holder;
       userViewHolder.bind(mContext, dataHolder, position);
       break;
     case 1:
       ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
       itemViewHolder.bind(mContext, dataHolder, position);
       break;
     case 2:
       DividerViewHolder dividerViewHolder = (DividerViewHolder) holder;
       dividerViewHolder.bind(mContext, dataHolder, position);
       break;
     default:
       break;
   }
 }