用IF条件语句改变imageview

引用会从服务器得到son，我想要用的值是categoryid，比较详细的在下边的代码中。
我怎么才能用从json取得的 categoryid 来用条件改变imageview？
我的ImageView在ImageAdapter类里边
我想要用条件语句

 if(catetgoryid == 1){
       imageview.setImageResource(R.drawable.image1)
    } elseif (categoryid == 2 {
        imageview.setImageResource(R.drawable.image2)
    } else {
     imageview.setImageResorce(R.drawable.image3)
    }

JSON

{
"count": 54,
"data": [
    {
        "userid": "24",
        "cardid": "114",
        "title": "meeting now!",
        "carddate": "2012-12-26",
        "categoryid": "2",
        "cardimage": "http://xxx.xxx/data/card/thum/9589266f7983dbe72ff8481800f51ef9.jpg",
        "public": "1",
        "user": {
            "user_id": "24",
            "firstname": "kong",
            "lastname": "kea",
            "email": "xxx",
            "picture": "http://xxx.xxx/data/profiles/thum/default.png",
            "friend_status": "NOT_FRIEND"
        }
    }
]}

MainActivity.这个是用来获取json categoryid的
@Override

    protected Void doInBackground(String... params) {

        String url = "http://xxx.xxx.xxx/card/all/30/0/?token=57LzEsmBeykLbDCD04wTgK9WWV2XjJY0XBdqVU0HQvjIdu5EtTWOT1IQ1AYNwxt6Q5bG6FG73uvzLQSDGAIezwc8VcopEp0s63uzbdVgLSfts0TLmuVDOgyfn4lX";
        JSONArray data = null;

        try {

            JSONObject jsonObject = new JSONObject(getJSONUrl(url));

            MyArrList = new ArrayList<HashMap<String, Object>>();
            HashMap<String, Object> map;
            data = jsonObject.getJSONArray("data");
            for (int i = 0; i < data.length(); i++) {
                JSONObject c = data.getJSONObject(i);
                map = new HashMap<String, Object>();

                // Thumbnail Get ImageBitmap To Object
                map.put("cardimage", (String) c.getString("cardimage"));
                map.put("ImageThumBitmap",(Bitmap) loadBitmap(c.getString("cardimage")));

                map.put("categoryid",(String)c.getString("categoryid"));  // use it for condition 

                MyArrList.add(map);
            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;
    }

在这用条件

public class ImageAdapter extends BaseAdapter {
    private Context context;
    private ArrayList<HashMap<String, Object>> MyArr = new ArrayList<HashMap<String, Object>>();

    public ImageAdapter(Context c,ArrayList<HashMap<String, Object>> myArrList) {
        context = c;
        MyArr = myArrList;
    }

    public int getCount() {
        return MyArr.size();
    }

    public Object getItem(int position) {
        return position;
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        viewHolder = new ViewHolder();

        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.grid_item, null);
        }
            viewHolder.categoryCard = (ImageView) convertView.findViewById(R.id.category_card);

            // ====================== use codition here ===============
            viewHolder.categoryCard.setImageResource(R.drawable.card_beauty);  
            viewHolder.imageView = (ImageView) convertView.findViewById(R.id.imageView1);

        try {
            viewHolder.imageView.setImageBitmap((Bitmap) MyArr.get(position).get("ImageThumBitmap"));
        } catch (Exception e) {
            viewHolder.imageView.setImageResource(android.R.drawable.ic_menu_report_image);
        }

        return convertView;

    }

}