ListView 自定义Adapter

public class MainActivity extends Activity {    private List<Map<String, Object>> listItems;    private String[] names;    private String[] ages;    private ListView lv;    private MyAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        names = getResources().getStringArray(R.array.name);        ages = getResources().getStringArray(R.array.age);        lv = (ListView) findViewById(R.id.lv);        listItems = getListItems();        adapter = new MyAdapter(MainActivity.this, listItems);        lv.setAdapter(adapter);    }    private List<Map<String, Object>> getListItems() {        List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();        for (int i = 0; i < names.length; i++) {            Map<String, Object> map = new HashMap<String, Object>();            map.put("name", names[i]);            map.put("age", ages[i]);            listItems.add(map);        }        return listItems;    }}

public class MyAdapter extends BaseAdapter {    private List<Map<String, Object>> listItems;    private LayoutInflater inflater;    public final class ListItemView {        public TextView tv1;        public TextView tv2;    }    public MyAdapter(Context context, List<Map<String, Object>> listItems) {        this.listItems = listItems;        inflater = LayoutInflater.from(context);    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return listItems.size();    }    @Override    public Object getItem(int arg0) {        // TODO Auto-generated method stub        return null;    }    @Override    public long getItemId(int arg0) {        // TODO Auto-generated method stub        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        ListItemView liv;        if (null == convertView) {            liv = new ListItemView();            convertView = inflater.inflate(R.layout.listitem, null);            liv.tv1 = (TextView) convertView.findViewById(R.id.tv1);            liv.tv2 = (TextView) convertView.findViewById(R.id.tv2);            convertView.setTag(liv);        } else {            liv = (ListItemView) convertView.getTag();        }        liv.tv1.setText((String) listItems.get(position).get("name"));        liv.tv2.setText((String) listItems.get(position).get("age"));        return convertView;    }}