listView显示多种布局 android

public View getView(int position, View convertView, ViewGroup parent) {
    System.out.println("getView::" + position);
    int type = TYPE_SEND;
    try
    {
        type = Integer.parseInt(data.get(position).get("type"));
    } catch (Exception e)
    {
        e.printStackTrace();
    }
    ViewHolder holder = null;
    if (convertView == null)
    {
        System.out.println("getView::convertView is null");
        holder = new ViewHolder();
        switch (type)
        {
        case TYPE_SEND:
            convertView = View.inflate(getBaseContext(),
                    R.layout.listitem_send, null);
            holder.text = (TextView) convertView
                    .findViewById(R.id.message);
            break;
        case TYPE_RECEIVE:
            convertView = View.inflate(getBaseContext(),
                    R.layout.listitem_receive, null);
            holder.text = (TextView) convertView
                    .findViewById(R.id.message);
            break;
        case TYPE_PIC:
            convertView = new ImageView(getBaseContext());
            ((ImageView) convertView).setImageResource(R.drawable.icon);
            break;
        }
        convertView.setTag(holder);
    }
    else
    {
        System.out.println("getView::convertView not null");
        holder = (ViewHolder) convertView.getTag();
    }

    if (type != TYPE_PIC)
    {
        String msg = data.get(position).get("content");
        holder.text.setText(msg);
    }
    return convertView;
}

备注：无论使用几种布局，都必须放在一个holder里，不允许中心new Holder