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;
    }
}