附加图像时 Text View 的 Resource Id 出错

在spinner中我想附加一个image 和一个 text View
下面是 layout xml 代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
       <ImageView
        android:id="@+id/UICurrencyCurrencyFlag"
        android:layout_height="20dp"
        android:layout_width="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/cross_btn" />
    <TextView 
        android:id="@+id/UICurrencyCurrencyName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:textStyle="bold"
        android:layout_toRightOf="@+id/UICurrencyCurrencyFlag"
        android:text="TextView" />
</RelativeLayout>
Custom Array Adapter 使用的构造函数：
public class CustomArrayAdapterForCurrencies extends ArrayAdapter<CharSequence> 
{
    private final Activity context;
    public final CharSequence[] keys;
     public CustomArrayAdapterForCurrencies(Activity context, CharSequence[] keys) 
    {
        super(context, R.layout.ui_currency_layout,keys);
        this.context = context;
        this.keys = keys;
}
@Override
    public View getView(int position, View convertView, ViewGroup parent) {
            View view = null;
            LayoutInflater inflator = context.getLayoutInflater();
            view = inflator.inflate(R.layout.ui_currency_layout, null);
            final ViewHolder viewHolder = new ViewHolder();

当 activity 开启时，spinner 没有显示 image 和text，但是当我选择 spinner 时，给出错误 Adapter need resouce id for the text view
如何解决这个问题?