标签:android ar os sp on bs amp as tt
ViewHolder不是Android的开发API,而是一种设计方法,就是设计个静态类,缓存一下,省得Listview更新的时候,还要重新操作。
public View getView(int pos, View convertView, ViewGroup parent){
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder.text = (TextView) convertView.findViewById( R.id.text));
holder.icon = (ImageView) convertView.findViewButId( R.id.icon));
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(DATA[pos]);
holder.icon.setImageBitmap((pos & 1) == 1 ? mIcon1 : mIcon2);
return convertView;
// holder = new ViewHolder();
}
// ViewHolder 模式, 效率提高 50%
static class ViewHolder {
TextView text;
ImageView icon;
}
标签:android ar os sp on bs amp as tt
原文地址:http://www.cnblogs.com/poorfish/p/4152145.html