我在ListView中有一個ImageView,ImageView有一個默認圖像,在渲染時,我異步下載圖像並將它們加載到ImageViews中。它完美地工作,但是當我向下滾動兩個項目並向後滾動時,第一行和第二行中的默認圖像變爲第六和第七行的圖像。ListView中的圖像在Android中滾動時發生變化
我閱讀了這些主題,但沒有找到解決方案。
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);
}
};
}
我試圖建立一個布爾變量來檢查我的形象是否設置與否,也試過用SharedPreferences,但是這部分我代碼在圖像改變時沒有運行。
if(!encls.isEmpty()){
holder.imageUrl = encls.get(0).getUrl();
}
if (!encls.isEmpty() && holder.imageUrl != null && !holder.imageUrl.equals("null")) {
holder.setImage(holder.imageUrl);
}
如果您需要實現它的生產,我會強烈建議你使用一個庫(畢加索或滑翔) – lelloman
請點擊此鏈接,這將作品[請參閱此鏈接( http://stackoverflow.com/questions/36563923/my-images-changing-during-scroll-in-listview-android) –
@MilanPansuriya謝謝,我之前讀過,但沒有幫助。 – user1721713