Question

从几天开始，我正在试图找出为什么我的自定义适配器迭代次数超过应有的数量。我正在尝试显示3个项目，但我的自定义适配器比预期多次进入函数getView()。

每次输入getView（）时都会打印log，logcat会显示：

    log-entered getView 
    log-entered getView 
    log-entered getView 

    log-entered getView 
    log-entered getView 
    log-entered getView 

    .
    .
    .
    so on..

这种情况发生了5次，每次getView（）都会发生3次。

主要活动的代码：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_torneos);

        final ListView listTorneos=(ListView) findViewById(R.id.listViewTorneos);

        ArrayList<Torneo> list = getListData();
        listTorneos.setAdapter(new CustomListAdapter(this,list));
    }

private ArrayList<Torneo> getListData() {
        ArrayList<Torneo> results = new ArrayList<Torneo>();
        Torneo torneo = new Torneo();
        torneo.setNombre("Timiza");
        torneo.setLugar("Parque metropolitano timiza1");
        torneo.setCiudad("Bogota");
        results.add(torneo);

        torneo = new Torneo();
        torneo.setNombre("salitre");
        torneo.setLugar("Parque metropolitano timiza2");
        torneo.setCiudad("Bogota");
        results.add(torneo);

        torneo = new Torneo();
        torneo.setNombre("laverdieri");
        torneo.setLugar("Parque metropolitano timiza3");
        torneo.setCiudad("Bogota");
        results.add(torneo);


        return results;
    }

我的 CustomAdapter类的代码：

public class CustomListAdapter extends BaseAdapter {

    private ArrayList<NewsItem> listData;

    private LayoutInflater layoutInflater;

    public CustomListAdapter(Context context, ArrayList<NewsItem> listData) {
        this.listData = listData;
        layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return listData.size();
    }

    @Override
    public Object getItem(int position) {
        return listData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        Log.d("info","log-entered getView");
        ViewHolder holder;
        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.list_row_layout, null);
            holder = new ViewHolder();
            holder.headlineView = (TextView) convertView.findViewById(R.id.title);
            holder.reporterNameView = (TextView) convertView.findViewById(R.id.reporter);
            holder.reportedDateView = (TextView) convertView.findViewById(R.id.date);
            holder.imageView = (ImageView) convertView.findViewById(R.id.thumbImage);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        NewsItem newsItem = (NewsItem) listData.get(position);

        holder.headlineView.setText(newsItem.getHeadline());
        holder.reporterNameView.setText("By, " + newsItem.getReporterName());
        holder.reportedDateView.setText(newsItem.getDate());

        if (holder.imageView != null) {
            new ImageDownloaderTask(holder.imageView).execute(newsItem.getUrl());
        }

        return convertView;
    }

    static class ViewHolder {
        TextView headlineView;
        TextView reporterNameView;
        TextView reportedDateView;
        ImageView imageView;
    }
}

Answer 1

每个布局传递可以多次调用getView（对于每个子节点的onMeasure和onLayout）。您正在回收视图并使用View Holder（避免性能问题的技术），那么问题是什么？

ListView自定义适配器迭代列表中项目数的更多次

1 个答案: