我需要创建一个ListView并仅为所选行显示更详细的布局,以便向客户显示更多信息.我尝试的是以下内容：
newsListView.setAdapter(new NewsListAdapter(this,news));
newsListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,View view,int position,long id) {
LayoutInflater inflater = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//Here I tried to change layout of this row only
view = inflater.inflate(R.layout.listitem_news_selected,null);
TextView info = (TextView) view.findViewById(R.id.info);
NewsData news = (NewsData) parent.getItemAtPosition(position);
info.setText(news.getInfo());
}
});
这是NewsListAdapter：
public class NewsListAdapter extends BaseAdapter {
List<NewsData> items;
Activity context;
/* private view holder class */
private class ViewHolder {
TextView title;
ImageView image;
}
@Override
public View getView(int position,View convertView,ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.listitem_news,null);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.image = (ImageView) convertView.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
NewsData news = items.get(position);
holder.title.setText(news.getTitle());
new DownloadImageTask(holder.image).execute(news.getImgUrl());
return convertView;
}
}
In this question,类似的问题被问到,但它没有帮助我.我猜我需要用Adapter做一些事情,但我被困在这里.任何想法将不胜感激.
解决方法
你正在做什么甚至不会改变ListView项目的视图,你正在膨胀一个未知的视图.
解：
在适配器中创建一个方法来设置所选项的位置：
public void selectedItem(int position)
{
this.position = position; //position must be a global variable
}
当位置等于点击项位置时,在getView中为视图充气
@Override
public View getView(int position,ViewGroup parent) {
ViewHolder holder = null;
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.listitem_news,null);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.image = (ImageView) convertView.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
NewsData news = items.get(position);
holder.title.setText(news.getTitle());
new DownloadImageTask(holder.image).execute(news.getImgUrl());
if(this.position == position)
{
view2 = mInflater.inflate(R.layout.listitem_news_selected,null);
TextView info = (TextView) view2.findViewById(R.id.info);
info.setText(news.getInfo());
return view2;
}
return convertView;
}
在你的onItemClick中使用它
NewsListAdapter adapter = new NewsListAdapter(this,news);
newsListView.setAdapter(adapter );
newsListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,long id) {
adapter.selectedItem(position);
adapter.notifyDataSetChange();
}
});
始终有适配器的引用/对象,因此您可以在单击它时刷新listView.
