• getView()在ListView中會(huì)不斷的被調(diào)用，無(wú)論是用convertView + ViewHolder進(jìn)行優(yōu)化。
• ViewHolder只會(huì)被創(chuàng)建一個(gè)屏幕中條目的個(gè)數(shù)，即convertView == null條件滿足的次數(shù)

class TigerAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return 500;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            System.out.println("我被調(diào)用了?。。。?！" + position);
            ViewHolder viewHolder;
            if (convertView == null) {
                convertView = new TextView(mContext);
                
                viewHolder = new ViewHolder();
                System.out.println("ViewHolder被調(diào)用了");
                

                convertView.setTag(viewHolder);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            ((TextView) convertView).setTextSize(28);
            return convertView;
        }

    }

Paste_Image.png