如何在Android的ListView中显示两个不同位置的条目

public class CustomAdapter extends BaseAdapter {
    private static final int TYPE_ITEM1 = 0;
    private static final int TYPE_ITEM2 = 1;

    private List<Item1> item1List;
    private List<Item2> item2List;

    public CustomAdapter(List<Item1> item1List, List<Item2> item2List) {
        this.item1List = item1List;
        this.item2List = item2List;
    }

    @Override
    public int getCount() {
        return item1List.size() + item2List.size();
    }

    @Override
    public Object getItem(int position) {
        if (position < item1List.size()) {
            return item1List.get(position);
        } else {
            return item2List.get(position - item1List.size());
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getItemViewType(int position) {
        if (position < item1List.size()) {
            return TYPE_ITEM1;
        } else {
            return TYPE_ITEM2;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int viewType = getItemViewType(position);

        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            switch (viewType) {
                case TYPE_ITEM1:
                    convertView = inflater.inflate(R.layout.item1_layout, parent, false);
                    break;
                case TYPE_ITEM2:
                    convertView = inflater.inflate(R.layout.item2_layout, parent, false);
                    break;
            }
        }

        switch (viewType) {
            case TYPE_ITEM1:
                Item1 item1 = (Item1) getItem(position);
                // 设置item1的数据到convertView中
                break;
            case TYPE_ITEM2:
                Item2 item2 = (Item2) getItem(position);
                // 设置item2的数据到convertView中
                break;
        }

        return convertView;
    }
}