【Android】说做就做：带图标的list item

我用mwjian，Quake Wang的方法实现时是按照以下代码实现的，但在执行时报错java.lang.ClassCastException.时说类型转换错误吧？但我不清楚是什么错误，麻烦各位达人帮忙看一下，多谢！！
共有两个.java文件，
一个是主文件HelloTwoB .java,代码如下：
package com.google.android.hellotwob;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.ListActivity;
import android.os.Bundle;

public class HelloTwoB extends ListActivity {

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setTheme(android.R.style.Theme_Dark);
setContentView(R.layout.main);


//SimpleAdapter demo
List listitems = fillMaps();
IconTextAdapter adapter=new IconTextAdapter( this,
listitems,
R.layout.list_row,
new String[]{"icon", "city"},
new int[]{R.id.icon, R.id.city},
new int[]{R.drawable.icon_smile, R.drawable.icon_smile},
R.id.icon );

setListAdapter(adapter);
}

private List fillMaps(){
List items = new ArrayList();

Map i1 = new HashMap();
i1.put("icon", getResources().getDrawable(R.drawable.icon_smile));
i1.put("city", "Beijing");
items.add(i1);

Map i2 = new HashMap();
i2.put("icon", getResources().getDrawable(R.drawable.icon_smile));
i2.put("city", "Tokyo");
items.add(i2);

return items;
}


}

另一个是文件IconTextAdapter.java,代码如下：
package com.google.android.hellotwob;

import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.SimpleAdapter;

public class IconTextAdapter extends SimpleAdapter {

private int[] mIcons;
private int mIconId;

/**
* @param icons Icon's id will display.
* @param iconId icon in layout's id
*/
public IconTextAdapter( Context context,
List data,
int resource,
String[] from,
int[] to,
int[] icons,
int iconId ) {
super(context, data, resource, from, to);

mIcons = icons;
mIconId = iconId;
}

public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
ImageView img = (ImageView) v.findViewById(mIconId);
img.setImageResource(mIcons[position]);
return v;
}
}


xml文件有两个：
一个是main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView id="@id/android:list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:drawSelectorOnTop="false"
/>
</LinearLayout>

另一个是：list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView id="@+id/icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
<TextView id="@+id/city"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>

另外还有一个icon,icon_smail.jpg文件
icon_smile.jpg


还有一个问题，List，Map可以如下这样使用吗？
private List fillMaps(){
List items = new ArrayList();

Map i1 = new HashMap();
i1.put("icon", getResources().getDrawable(R.drawable.icon_smile));
i1.put("city", "Beijing");
items.add(i1);

Map i2 = new HashMap();
i2.put("icon", getResources().getDrawable(R.drawable.icon_smile));
i2.put("city", "Tokyo");
items.add(i2);

return items;
}

多谢各位了！！！

HashMap j2me好像不支持吧！