RecyclerView

Question

我创建了Recyclerview，我想在此回收视图上应用搜索过滤器。我已经执行了下面的代码。但是在performFiltering（）期间，它在logcat中显示错误，如下所示。

我的代码：

public CustomFilter(List<SearchAgentbean.GetSearchAgent> filterList, SearchAgentAdapter adapter)
{
    this.adapter=adapter;
    this.filterList=filterList;
}

//FILTERING OCURS
@Override
protected FilterResults performFiltering(CharSequence constraint) {
    FilterResults results=new FilterResults();

    //CHECK CONSTRAINT VALIDITY
    if(constraint != null && constraint.length() > 0)
    {
        //CHANGE TO UPPER
        constraint=constraint.toString().toUpperCase();
        //STORE OUR FILTERED PLAYERS
        ArrayList<SearchAgentbean.GetSearchAgent> filteredPlayers=new ArrayList<>();

        for (int i=0;i<filterList.size();i++)
        {
            //CHECK
            Logger.i("SEARCH","SEARCH"+filterList.get(i).getUSERNAME());
                if(filterList.get(i).getUSERNAME().toUpperCase().contains(constraint))
                {
                    //ADD PLAYER TO FILTERED PLAYERS
                    filteredPlayers.add(filterList.get(i));
                }
        }
        results.count=filteredPlayers.size();
        results.values=filteredPlayers;
    }else
    {
        results.count=filterList.size();
        results.values=filterList;
    }

    return results;
}

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {

    adapter.marrayagentdata= (List<SearchAgentbean.GetSearchAgent>) results.values;
    //REFRESH
    adapter.notifyDataSetChanged();
}