Question

我是Android新手，我无法找到一种方法来检索整数值并在列表视图中显示它们。

public class NewsItem {

    private int content;

    public int getContent() {    
        return content;
    }

    public void setContent(int content) {

      this.content = content;
    }
}

适配器类

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.householdincomeview, null);

            viewHolder = new ViewHolder();
            viewHolder.headlineView(TextView) convertView.findViewById(R.id.content);

        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.headlineView.
                setText(arrayList.get(position).getContent());
        return convertView;
    }

    static class ViewHolder {
        TextView headlineView;

    }

活动类

final ListView listView = (ListView) findViewById(R.id.viewincome);

ArrayList<NewsItem> getData = getitem();
listView.setAdapter(newHouseHoldincomeAdapter(this,getData));


private ArrayList<NewsItem> getitem() {
    ArrayList<NewsItem> result = new ArrayList<NewsItem>();
    NewsItem newsItem = new NewsItem();

    newsItem.setContent(1);

    return result;
}

listview接受字符串值，但是当我尝试在getview中检索整数时，我收到错误，因为空指针异常。如何显示整数值？

Answer 1

在适配器类中，使用String.ValueOf()方法设置文本。如下所示。

viewHolder.headlineView.setText(String.ValueOf(arrayList.get(position).getContent()));

另请查看Developer Site以获取更多信息。

Answer 2

使用：

viewHolder.headlineView.setText(arrayList.get(position).getContent() + "");

或者：

viewHolder.headlineView.setText(String.valueOf(arrayList.get(position).getContent()));

Answer 3

if (convertView == null)
{
     convertView=layoutInflater.
     inflate(R.layout.householdincomeview,null);
    viewHolder=new ViewHolder();
    viewHolder.headlineView=(TextView)convertView.
  findViewById(R.id.content);
  convertView.setTag(viewHolder);// settag
else
{
    viewHolder=(ViewHolder)convertView.getTag();
}

Android - 如何在列表视图中设置整数值

3 个答案: