Question

我在listview中的图片有问题，所以，让我来介绍一下我的问题：listview包含项目，每个项目包含图像，图像位于内存智能手机中（对于下载图像我使用picasso），以及何时我查看我的列表视图并滚动它，我看到每个项目中的图像彼此混淆......所以，我不知道如何解决这个问题。你能帮我吗？

让我展示我的列表适配器：

public class NewsAdapter extends BaseAdapter {

private List<News> newsList;
private LayoutInflater layoutInflater;
private Context context;

public NewsAdapter(Context context, List<News> newsList) {
    this.newsList = newsList;
    this.context = context;
    this.layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = convertView;
    if (view == null){
        view = layoutInflater.inflate(R.layout.item_layout_news, parent, false);
    }


    News news = getNews(position);


    if (news.picture != null) {
        File imagePath;
        imagePath = new File(context.getFilesDir()+ "/" + news.picture);
        Picasso.with(context) 
                .load(imagePath)
                .placeholder(R.drawable.loading)
                .error(R.drawable.no_name_)
                .into(news_photo);
    }else {
    } 
    return view;
}

@Override
public long getItemId(int position) {
    return newsList.get(position).getId();
}

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

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

private News getNews(int position) {
    return (News)getItem(position);
}
}

感谢您的关注。

更新

public class NewsAdapter extends BaseAdapter {

private List<News> newsList;
private LayoutInflater layoutInflater;
private Context context;

private static class FieldHolder {
    public ImageView image;
}
public NewsAdapter(Context context, List<News> newsList) {
    this.newsList = newsList;
    this.context = context;
    this.layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = convertView;
    FieldHolder fieldHolder = new FieldHolder();
    if (view == null){
        view = layoutInflater.inflate(R.layout.item_layout_news, parent, false);
                    final ImageView news_photo = (ImageView)view.findViewById(R.id.news_photo);
        fieldHolder.image = news_photo;
        view.setTag(fieldHolder);
    }else {
        fieldHolder =(FieldHolder) view.getTag();
    }
    News news = getNews(position);
        File imagePath;
        imagePath = new File(context.getFilesDir()+ "/" + news.picture);
        Picasso.with(context) //передаем контекст приложения
                .load(imagePath)
                .placeholder(R.drawable.loading)
                .error(R.drawable.no_name_)
                .into(fieldHolder.image);
    return view;
}

@Override
public long getItemId(int position) {
    return newsList.get(position).getId();
}

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

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

private News getNews(int position) {
    return (News)getItem(position);
}
}

它似乎没有错误，但我不确定我是否正确使用毕加索，你能给我一些关于使用Picasso和listview的建议吗？

Answer 1

你缺少一些getView的结构是不正确的应该。缺少部分请检查正确的getView结构

读到这个： http://www.survivingwithandroid.com/2013/02/android-listview-adapter-imageview.html

请参阅适配器的getView部分

Answer 2

持有效率。什么是news_photo？在毕加索的.into中你应该传递你的布局。

listview中的Android图片

2 个答案: