我在ListView中有一个ImageView,ImageView有一个默认图像,在渲染时,我异步下载图像并将它们加载到ImageViews中。它完美地工作,但是当我向下滚动两个项目并向后滚动时,第一行和第二行中的默认图像变为第六和第七行的图像。ListView中的图像在Android中滚动时发生变化
我阅读了这些主题,但没有找到解决方案。
Image change when i scroll gridview
My images changing during scroll in listview android
ListView images changing During Scroll
public class RssAdapter extends BaseAdapter {
private final List<SyndEntry> items;
private static Context context;
private static Map<String, Bitmap> mBitmapCache = new HashMap<String, Bitmap>();
public RssAdapter(Context context, List<SyndEntry> items) {
this.items = items;
this.context = context;
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return items.get(position);
}
@Override
public long getItemId(int id) {
return id;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = new ViewHolder();
if (convertView == null) {
convertView = View.inflate(context, R.layout.rss_item, null);
holder.itemTitle = (TextView) convertView.findViewById(R.id.itemTitle);
holder.itemPubDate = (TextView) convertView.findViewById(R.id.itemPubDate);
holder.itemImg = (ImageView) convertView.findViewById(R.id.itemImg);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.itemTitle.setText(items.get(position).getTitle());
holder.itemPubDate.setText(items.get(position).getPublishedDate().toString());
List<SyndEnclosure> encls = items.get(position).getEnclosures();
if(!encls.isEmpty()){
holder.imageUrl = encls.get(0).getUrl();
}
if (!encls.isEmpty() && holder.imageUrl != null && !holder.imageUrl.equals("null")) {
holder.setImage(holder.imageUrl);
}
return convertView;
}
private static class ViewHolder {
TextView itemTitle;
TextView itemPubDate;
ImageView itemImg;
String imageUrl;
public void setImage(String imageUrl) {
this.imageUrl = imageUrl;
Bitmap imageBitmap = mBitmapCache.get(imageUrl);
if(imageBitmap!=null){
itemImg.setImageBitmap(imageBitmap);
} else {
AsyncHttpClient client = new AsyncHttpClient();
client.get(imageUrl, null, fileHandler);
}
}
FileAsyncHttpResponseHandler fileHandler = new FileAsyncHttpResponseHandler(context) {
@Override
public void onFailure(int statusCode, Header[] headers, Throwable throwable, File file) {
}
@Override
public void onSuccess(int statusCode, Header[] headers, File response) {
Bitmap imageBitmap = BitmapFactory.decodeFile(response.getPath());
itemImg.setImageBitmap(imageBitmap);
mBitmapCache.put(imageUrl, imageBitmap);
}
};
}
我试图建立一个布尔变量来检查我的形象是否设置与否,也试过用SharedPreferences,但是这部分我代码在图像改变时没有运行。
if(!encls.isEmpty()){
holder.imageUrl = encls.get(0).getUrl();
}
if (!encls.isEmpty() && holder.imageUrl != null && !holder.imageUrl.equals("null")) {
holder.setImage(holder.imageUrl);
}
如果您需要实现它的生产,我会强烈建议你使用一个库(毕加索或滑翔) – lelloman
请点击此链接,这将作品[请参阅此链接( http://stackoverflow.com/questions/36563923/my-images-changing-during-scroll-in-listview-android) –
@MilanPansuriya谢谢,我之前读过,但没有帮助。 – user1721713