适配器筛选期间的java.lang.IndexOutOfBoundsException

这部分代码应该过滤适配器中的对象，并根据用户输入在listview中删除或添加对象。但是，当我尝试输入任何字母时，都会收到一个错误消息：java.lang.IndexOutOfBoundsException:无效索引5，大小为5或类似，具体取决于EditText中的输入。我不明白这是什么原因

代码如下：

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import nick.miros.BudgetControl.budgetcontrol.app.Currency;
import nick.miros.BudgetControl.budgetcontrol.app.R;

public class CurrencyAdapter extends ArrayAdapter<Currency> {
    private final Context context;
    private List<Currency> currencies;
    private CurrencyFilter currencyFilter;

    public CurrencyAdapter(Context context, List<Currency> currencies) {
        super(context, R.layout.list_currency, currencies);
        this.context = context;
        this.currencies = currencies;

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View rowView = inflater.inflate(R.layout.list_currency, parent, false);

        TextView currencyName = (TextView) rowView.findViewById(R.id.currencyName);
        TextView currencySymbol = (TextView) rowView.findViewById(R.id.currencySymbol);

        currencyName.setText(currencies.get(position).getCurrencyName());
        currencySymbol.setText(currencies.get(position).getSymbol());

        return rowView;
    }

    @Override
    public Filter getFilter() {
        if (currencyFilter == null)
            currencyFilter = new CurrencyFilter();

        return currencyFilter;
    }


    private class CurrencyFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            // We implement here the filter logic
            if (constraint == null || constraint.length() == 0) {
                // No filter implemented we return all the list
                results.values = currencies;
                results.count = currencies.size();
            }
            else {
                // We perform filtering operation
                List<Currency> nCurrencyList = new ArrayList<Currency>();

                for (Currency c : currencies) {
                    if (c.getCurrencyName().toUpperCase().startsWith(constraint.toString().toUpperCase()))
                        nCurrencyList.add(c);
                }

                results.values = nCurrencyList;
                results.count = nCurrencyList.size();

            }
            return results;
        }

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

            // Now we have to inform the adapter about the new list filtered
            if (results.count == 0)
                notifyDataSetInvalidated();
            else {
                currencies = (List<Currency>) results.values;
                notifyDataSetChanged();
            }
        }
    }
}

哪个指向这条线：

currencyName.setText(currencies.get(position).getCurrencyName());

---

好的，找到了。我需要在自定义适配器中实现getCount方法。

currencyName.setText(currencies.get(position).getCurrencyName());