我ListView
Adapter
,并使用持有人。但后来我读到recyclerView.ViewHolder
并且现在感到困惑,它与我现在使用的那个有什么不同?我的意思是出于优化目的,我想知道在不使用recyclerView
的情况下仅使用持有者是否不够好。
public class NewsAdapter extends ArrayAdapter<News> {
Context context;
List<News> myList;
public NewsAdapter(Context context, int resource, List<News> objects) {
super(context, resource, objects);
this.context = context;
this.myList = objects;
}
@Override
public News getItem(int position) {
if(myList != null)
return myList.get(position);
return null;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder;
if (convertView == null){
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_news, null);
holder = new NewsAdapter.Holder();
holder.title = (TextView)convertView.findViewById(R.id.textViewTitle);
holder.datePosted = (TextView)convertView.findViewById(R.id.textViewDate);
holder.imageView = (ImageView)convertView.findViewById(R.id.imageViewThumbnailpic);
convertView.setTag(holder);
}else{
holder = (Holder)convertView.getTag();
}
News news = getItem(position);
holder.title.setText(news.getTitle());
holder.datePosted.setText(news.getDatePost());
Picasso.with(context)
.load(news.getImgUrl())
.placeholder(R.drawable.coin25)
.error(R.drawable.hnbspic)
.into(holder.imageView);
return convertView;
}
private class Holder{
ImageView imageView;
TextView title;
TextView datePosted;
}
}
答案 0 :(得分:0)
最好使用Recyclerview,因为它已针对各种场景进行了优化,而不仅仅针对View holder模式进行了优化,例如它提供了确定项目布局方式的选项,或者是什么应该是动画或自定义在每个项目中绘图。您可以阅读更多this媒体帖子