Android listview重复元素

我有一个 listview ，在那将基于 arraylist 动态填充 . 我定义了一个自定义 arrayadapter 类 . 该列表完全正确，只是当我将屏幕从横向旋转到纵向时，列表重复每个元素3次 . 这是 getView 函数的代码 .

rows = (ListView)findViewByid(R.id.listview1);// in adapter constructor

public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder holder;

    if(convertView == null){
        LayoutInflater inflater =getLayoutInflater();
        convertView = inflater.inflate(R.layout.player_slot,null);

        holder = new ViewHolder(convertView, position);
    }
    else holder = (ViewHolder) convertView.getTag();

    holder.player_name = (TextView) convertView.findViewById(R.id.name);
    holder.player_score = (TextView) convertView.findViewById(R.id.score);
    holder.dec_score = (Button) convertView.findViewById(R.id.decrement);
    holder.inc_score = (Button) convertView.findViewById(R.id.increment);
    holder.dec_score.setTag(holder);
    holder.inc_score.setTag(holder);
    convertView.setTag(holder);

    Button dec = (Button)convertView.findViewById(R.id.decrement);
    Button inc =(Button)convertView.findViewById(R.id.increment);
    TextView name = (TextView)convertView.findViewById(R.id.name);
    TextView score = (TextView)convertView.findViewById(R.id.score);

    System.out.println("tag = " +dec.getTag());

    Player temp = getPlayer(position);
    System.out.println(temp.getPlayer_name() + temp.getPlayer_score());
    if(temp != null){
        //holder.player_name.setText(temp.getPlayer_name());
        //holder.player_score.setText(""+temp.getPlayer_score());
        name.setText(temp.getPlayer_name());
        score.setText(""+temp.getPlayer_score());
    }

    dec.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            int position =  rows.getPositionForView((View)v.getParent());
            Player temp = getPlayer(position);
            System.out.println("Player "+ temp.getPlayer_name() + "'s score changed");
            temp.setPlayer_score(temp.getPlayer_score()-score_increment);
            PlayerAdapter.this.notifyDataSetChanged();
        }   
    });

    inc.setOnClickListener(new OnClickListener(){
        private Button dec;
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            int position =  rows.getPositionForView((View)v.getParent());
            Player temp = getPlayer(position);
            System.out.println("Player "+ temp.getPlayer_name() + "'s score changed");
            temp.setPlayer_score(temp.getPlayer_score()+score_increment);
            PlayerAdapter.this.notifyDataSetChanged();
        }
    });
    return convertView;
}