更改Android中所選列表項的布局

Question

我需要創建一個ListView並僅為所選行顯示更詳細的布局，以便向客戶顯示更多信息。 我嘗試的是以下內容：

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());
    }
});

這是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;
    }
}

在這個問題中 ，提出了類似的問題，但它沒有幫助我。 我猜我需要用Adapter做一些事情，但我被困在這里。 任何想法將不勝感激。

Answer 1

你正在做什么甚至不會改變ListView項目的視圖，你正在膨脹一個未知的視圖。

解：

在適配器中創建一個方法來設置所選項的位置：

public void selectedItem(int position)
{
   this.position = position; //position must be a global variable
}

當位置等於點擊項位置時，在getView為視圖充氣

@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());

    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使用它

NewsListAdapter adapter = new NewsListAdapter(this, news);
newsListView.setAdapter(adapter );
newsListView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

          adapter.selectedItem(position);
          adapter.notifyDataSetChange();
    }
});

始終有適配器的reference/object ，因此您可以在單擊它時刷新listView。