摘要：利用完成復用把中獲得的控件在中復用省去重復創建控件一種常見的情況，舉例有五個固定的控件要利用顯示這種情況下，先創建好個控件，并綁定將放入根據計算出要取中的哪個

一。利用PagerAdapter.instantiateItem,destroyItem 完成復用

1） 把destroyItem中獲得的View控件,在instantiateItem中復用
省去重復創建View控件

    private LinkedList mViewCache = null;  
    
    @Override  
    public Object instantiateItem(ViewGroup container, int position) {  
        Log.e("test","instantiateItem " + position);  
        ViewHolder viewHolder = null;  
        View convertView = null;  
        if(mViewCache.size() == 0){  
            convertView = this.mLayoutInflater.inflate(R.layout.viewadapter_item_layout ,  
                    null ,false);  
            TextView textView = (TextView)convertView.findViewById(R.id.view_pager_item_textview);  
            viewHolder = new ViewHolder();  
            viewHolder.textView = textView;  
            convertView.setTag(viewHolder);  
        }else {  
            convertView = mViewCache.removeFirst();  
            viewHolder = (ViewHolder)convertView.getTag();  
        }  
  
        viewHolder.textView.setText(datas.get(position).title);  
        viewHolder.textView.setTextColor(Color.YELLOW);  
        viewHolder.textView.setBackgroundColor(Color.GRAY);  
  
        container.addView(convertView ,ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT );  
  
        return convertView;  
    }  
  
    @Override  
    public void destroyItem(ViewGroup container, int position, Object object) {  
        Log.e("test","destroyItem " + position);  
        View contentView = (View) object;  
        container.removeView(contentView);  
        this.mViewCache.add(contentView);  
    }  

2）一種常見的情況，舉例：有五個固定的控件要利用ViewPager顯示
這種情況下，先創建好5個控件，并綁定ViewHolder,將ViewHolder放入List,

    @Override  
    public Object instantiateItem(ViewGroup container, int position) {  
        //根據position計算出要取List中的哪個ViewHolder
        viewhodler = list.get(index);
        return viewhodler.itemView;
    }