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我有檢索albumArt和使用AsyncTask在遊標適配器中將該藝術設置爲ImageView的問題。 當我打開我的應用程序，它看起來是這樣的： 
如何使用光標適配器中的AsyncTask加載albumArt
然後我向下滾動列表，一切都很好（也，如果我滾動列表不是非常快）： 
然後我滾動列表回到非常beggining（不是很快），它看起來罰款，以及： 
也許我做錯了什麼，我想，所以我有一個問題：
是否有可能以某種方式解決這個問題，我已經嘗試了很多不同的方法來實現AsyncTask並使其正常工作，但在一天結束時它看起來總是相同的。
下面是光標適配器代碼：
public class AllSongsCursorAdapter extends CursorAdapter {
public AllSongsCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
}
public boolean isCheckBoxVisible;
private AddToFavouritesArray favouritesArray = AddToFavouritesArray.getInstance();
private static class ViewHolder {
CheckBox checkBox;
TextView title;
TextView artist;
ImageView albumArt;
private ViewHolder(View view) {
checkBox = (CheckBox) view.findViewById(R.id.favouritesCheckBox);
title = (TextView) view.findViewById(R.id.title);
artist = (TextView) view.findViewById(R.id.artist);
albumArt = (ImageView) view.findViewById(R.id.albumArt);
}
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup viewGroup) {
View view = LayoutInflater.from(context).inflate(R.layout.song_item, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(view);
view.setTag(viewHolder);
return view;
}
@Override
public void bindView(View view, Context context, final Cursor cursor) {
final ViewHolder viewHolder = (ViewHolder) view.getTag();
if (isCheckBoxVisible) {
viewHolder.checkBox.setVisibility(View.VISIBLE);
} else {
viewHolder.checkBox.setVisibility(View.GONE);
}
final int position = cursor.getPosition();
viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (b) {
favouritesArray.integerArray.add(position);
} else {
favouritesArray.integerArray.remove(Integer.valueOf(position));
}
}
});
int songTitle = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
int songArtist = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
String currentTitle = cursor.getString(songTitle);
String currentArtist = cursor.getString(songArtist);
viewHolder.title.setText(currentTitle);
viewHolder.artist.setText(currentArtist);
//__________________________ALBUM_ART_______________________________________________________
viewHolder.albumArt.setTag(cursor.getPosition());
new AsyncTask<ViewHolder, Void, Bitmap>(){
private ViewHolder viewHolder;
@Override
protected Bitmap doInBackground(ViewHolder... viewHolders) {
viewHolder = viewHolders[0];
int id = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
long songId = cursor.getLong(id);
Bitmap albumArt = getAlbumId(context, songId);
return albumArt;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
super.onPostExecute(bitmap);
if(bitmap != null) {
viewHolder.albumArt.setImageBitmap(bitmap);
}else{
viewHolder.albumArt.setImageResource(R.drawable.placeholder);
}
}
}.execute(viewHolder);
}
private Bitmap getAlbumId(Context context, long id) {
Bitmap albumArt = null;
String selection = MediaStore.Audio.Media._ID + " = " + id + "";
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[]{
MediaStore.Audio.Media._ID, MediaStore.Audio.Media.ALBUM_ID},
selection, null, null);
if (cursor.moveToFirst()) {
long albumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
albumArt = getAlbumArt(context, albumId);
}
cursor.close();
return albumArt;
}
private Bitmap getAlbumArt(Context context, long albumId) {
Bitmap albumArt = null;
String selection = MediaStore.Audio.Albums._ID + " = " + albumId + "";
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, selection, null, null);
if (cursor.moveToFirst()) {
int art = cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART);
String currentArt = cursor.getString(art);
albumArt = BitmapFactory.decodeFile(currentArt);
}
cursor.close();
return albumArt;
}
}
是的，當然，沒有的AsyncTask一切工作正常，除了滾動很慢。 預先感謝您！
編輯
在一天結束的時候，這就是它是如何工作的。非常感謝@Orest Savchak，我的迴應票和接受你的答案。非常感謝。 // __________________________ ALBUM_ART_______________________________________________________
int id = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
long songId = cursor.getLong(id);
String string = getAlbumArtPath(context, songId);
if(string!=null) {
Picasso.with(context)
.load(new File(string))
.into(viewHolder.albumArt);
}else{
viewHolder.albumArt.setImageResource(R.drawable.placeholder);
}
}
private String getAlbumArtPath(Context context, long id) {
String selection = MediaStore.Audio.Media._ID + " = " + id + "";
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[]{
MediaStore.Audio.Media._ID, MediaStore.Audio.Media.ALBUM_ID},
selection, null, null);
if (cursor.moveToFirst()) {
long albumId = cursor.getLong(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
return getAlbumArt(context, albumId);
}
cursor.close();
return null;
}
private String getAlbumArt(Context context, long albumId) {
String selection = MediaStore.Audio.Albums._ID + " = " + albumId + "";
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, null, selection, null, null);
if (cursor.moveToFirst()) {
int art = cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART);
return cursor.getString(art);
}
cursor.close();
return null;
}
您可能要檢查這個圖像加載庫。請更清楚地描述你確切的問題是什麼。發生了什麼，你不想看到或什麼不工作？你的截圖不要告訴這很聰明。 –
@ Jonas問題是圖像設置不賴於賴特ImageViews。例如，第一張截圖和第三張截圖是在ListView的開始階段製作的，但在第一張截圖上，除了第一張和第三張（在向下滾動並返回開始之後）之外，您可能會在所有項目上看到相同的相冊集albumArts設置它應該如何。 –