public void addMoreDatas(List<M> datas){
  if (datas != null) {
    mDatas.addAll(mDatas.size(),datas);
    notifyItemRangeInserted(mDatas.size(),datas.size());
  }
}

public void addMoreDatas ( List < M > datas ) { if ( datas != null ) { mDatas . addAll ( mDatas . size ( ) , datas ) ; notifyItemRangeInserted ( mDatas . size ( ) , datas . size ( ) ) ; } }
insert data to datas footer ( example weibo loadmore same newly data )
