- getView()在ListView中会不断的被调用，无论是用convertView + ViewHolder进行优化。
- ViewHolder只会被创建一个屏幕中条目的个数，即convertView == null条件满足的次数
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("我被调用了！！！！！" + position);
ViewHolder viewHolder;
if (convertView == null) {
convertView = new TextView(mContext);
viewHolder = new ViewHolder();
System.out.println("ViewHolder被调用了");
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
((TextView) convertView).setTextSize(28);
return convertView;
}
}
Paste_Image.png
