ListView优化的

1.getView里的

    ViewHolder holder;
    if(convertView==null){
        holder=new ViewHolder();
        convertView= View.inflate(context, R.layout.list_item, null);
        holder.text=convertView.findViewById(R.id.text);
        convertView.setTag(holder);
    }else{
       holder= (ViewHolder) convertView.getTag();
    }
    
    holder.text.setText(list.get(position).getNews_title());		
    return convertView;
}
class ViewHolder{
    TextView text;
}