Android 滚动listview时，listview中项目的位置正在更改

我的应用程序有一个listview，listview的行由imageView和Textview组成。应用程序从web下载图像以在行布局中设置imageview。在上下查看listview时，我遇到了图像重新下载的问题。出于这个原因，我使用了ViewHolder模式来保存列表项。问题已经解决了，但这次我遇到了一个新问题

Listview中有15行。因此，列表底部的项目不会出现。当我向下滚动列表查看项目时，列表顶部的项目将进入lisview的末尾。另外，当我翻阅列表时，列表末尾的项目会排在列表的顶部

因此，它不会显示需要显示的值或行

我的getView（）方法的最后一个状态是

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


        ViewHolder viewHolder;

            if (convertView == null) {

                convertView = mInflater.inflate(R.layout.row_layout, null);

                TextView programName = (TextView)convertView.findViewById(R.id.programName);
                TextView programTime = (TextView)convertView.findViewById(R.id.programTime);
                TextView programState = (TextView)convertView.findViewById(R.id.programState);
                ImageView programImage = (ImageView)convertView.findViewById(R.id.programImage);


                programName.setText(values.programNames.get(position));
                programTime.setText(values.programTimes.get(position));
                new imageDownload(programImage).execute(values.programImageUrls.get(position)); 

                viewHolder = new ViewHolder();
                viewHolder.p_Name = programName;
                viewHolder.p_Time = programTime;
                viewHolder.p_State = programState;
                viewHolder.p_Image = programImage;

                convertView.setTag(viewHolder);

            }else{

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

            return convertView;
        }

我的观点持有者

public static class ViewHolder {
     TextView p_Name;
     TextView p_Time;
     TextView p_State;
     ImageView p_Image;
}

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非常感谢

请将此移到设置convertview的位置之外

programName.setText(values.programNames.get(position));
programTime.setText(values.programTimes.get(position));
new imageDownload(programImage).execute(values.programImageUrls.get(position));

所以看起来像这样

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


    ViewHolder viewHolder;

        if (convertView == null) {

            convertView = mInflater.inflate(R.layout.row_layout, null);

            TextView programName = (TextView)convertView.findViewById(R.id.programName);
            TextView programTime = (TextView)convertView.findViewById(R.id.programTime);
            TextView programState = (TextView)convertView.findViewById(R.id.programState);
            ImageView programImage =(ImageView)convertView.findViewById(R.id.programImage);



            viewHolder = new ViewHolder();
            viewHolder.p_Name = programName;
            viewHolder.p_Time = programTime;
            viewHolder.p_State = programState;
            viewHolder.p_Image = programImage;

            convertView.setTag(viewHolder);

        }else{

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

        viewHolder.p_Name.setText(values.programNames.get(position));
        viewHolder.p_Time.setText(values.programTimes.get(position));
        new imageDownload(programImage).execute(values.programImageUrls.get(position)); 


        return convertView;
    }

---

另外，我强烈建议您使用毕加索进行图像下载，因为它可以为您自动处理缓存。我还将考虑使用Butterknife注入ViewHolder，这将减少这里的代码

在ViewHolder类上应该有一个position值，以便可以比较从convertView.getTag（）检索到的ViewHolder的位置。如果convertView不为null，则需要确保视图中包含正确的信息

if (viewHolder.position != position) {
    //retrieves the correct position of the information
    viewHolder.p_Name.setText(values.programNames.get(position)); 

    //etc
    viewHolder.position = position;
}

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谢谢你的回答。我决定用毕加索的画作。我只是简单地修改了下面的代码

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

 ViewHolder viewHolder;

    if (convertView == null) {

        convertView = mInflater.inflate(R.layout.row_layout, null);

        TextView programName = (TextView)convertView.findViewById(R.id.programName);
        TextView programTime = (TextView)convertView.findViewById(R.id.programTime);
        TextView programState = (TextView)convertView.findViewById(R.id.programState);
        ImageView programImage =(ImageView)convertView.findViewById(R.id.programImage);

        viewHolder = new ViewHolder();
        viewHolder.p_Name = programName;
        viewHolder.p_Time = programTime;
        viewHolder.p_State = programState;
        viewHolder.p_Image = programImage;

        convertView.setTag(viewHolder);

    }else{

        viewHolder = (ViewHolder) convertView.getTag();
    }
            viewHolder.p_Ad.setText(values.programIsimleri.get(position));
            viewHolder.p_Saat.setText(values.programSaatleri.get(position));
  Picasso.with(getApplicationContext()).load(values.programImageUrls.get(position)).into(viewHolder.p_Image);


    return convertView;
}

---

代码现在工作正常。

您需要将其附加到viewholder.p_name.setText（）上，因为程序名textview超出了if/else语句的范围。