摘要：利用完成復(fù)用把中獲得的控件在中復(fù)用省去重復(fù)創(chuàng)建控件一種常見的情況，舉例有五個(gè)固定的控件要利用顯示這種情況下，先創(chuàng)建好個(gè)控件，并綁定將放入根據(jù)計(jì)算出要取中的哪個(gè)

一。利用PagerAdapter.instantiateItem,destroyItem 完成復(fù)用

1） 把destroyItem中獲得的View控件,在instantiateItem中復(fù)用
省去重復(fù)創(chuàng)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(gè)固定的控件要利用ViewPager顯示
這種情況下，先創(chuàng)建好5個(gè)控件，并綁定ViewHolder,將ViewHolder放入List,

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