import android.content.ContentQueryMap; //导入依赖的package包/类
@Override
  public Cursor loadInBackground() {

      Cursor mediaCursor = getContext().getContentResolver().query(mUri, mProjection, mSelection,
              mSelectionArgs, mSortOrder);
      //Get cursor filled with Audio Id's
      String [] projection =  new String[] {
              BaseColumns._ID, AlbumColumns.ALBUM
      };
      Uri uri = Audio.Albums.EXTERNAL_CONTENT_URI;
      String sortOrder = Audio.Albums.DEFAULT_SORT_ORDER;
      Cursor albumCursor = getContext().getContentResolver().query(uri, projection, null, null, sortOrder);

      //Matrix cursor to hold final data to be returned to calling context
      MatrixCursor cursor = new MatrixCursor( new String[]
      		{ BaseColumns._ID, MediaColumns.TITLE, AudioColumns.ARTIST, AudioColumns.ALBUM, AudioColumns.ALBUM_ID});
      //Map data from Audio Id cursor to the ALbumName Colum
      ContentQueryMap mQueryMap = new ContentQueryMap(albumCursor, AlbumColumns.ALBUM, false, null);

Map<String, ContentValues> data = mQueryMap.getRows();
      if (mediaCursor != null) {
          while(mediaCursor.moveToNext()) {
		String id = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(BaseColumns._ID));
		String title = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(MediaColumns.TITLE));
		String artist = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(AudioColumns.ARTIST));
		String album = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(AudioColumns.ALBUM));

		ContentValues tData = data.get(album);
		String albumid = (String) tData.get(BaseColumns._ID);
		cursor.addRow(new String[] {id, title, artist, album, albumid});
          }
          mediaCursor.close();
      }

      if (cursor != null) {
          // Ensure the cursor window is filled
          registerContentObserver(cursor, mObserver);
      }
      return cursor;
  }
 

import android.content.ContentQueryMap; //导入依赖的package包/类
@Override
  public Cursor loadInBackground() {

      Cursor mediaCursor = getContext().getContentResolver().query(mUri, mProjection, mSelection,
              mSelectionArgs, mSortOrder);
      //Get cursor filled with Audio Id's
      String [] projection =  new String[] {
              BaseColumns._ID, AlbumColumns.ALBUM
      };        
      Uri uri = Audio.Albums.EXTERNAL_CONTENT_URI;
      String sortOrder = Audio.Albums.DEFAULT_SORT_ORDER;
      Cursor albumCursor = getContext().getContentResolver().query(uri, projection, null, null, sortOrder);
      
      //Matrix cursor to hold final data to be returned to calling context
      MatrixCursor cursor = new MatrixCursor( new String[]
      		{ BaseColumns._ID, MediaColumns.TITLE, AudioColumns.ARTIST, AudioColumns.ALBUM, AudioColumns.ALBUM_ID});
      //Map data from Audio Id cursor to the ALbumName Colum
      ContentQueryMap mQueryMap = new ContentQueryMap(albumCursor, AlbumColumns.ALBUM, false, null);

Map<String, ContentValues> data = mQueryMap.getRows();
      if (mediaCursor != null) {
          while(mediaCursor.moveToNext()) {
		String id = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(BaseColumns._ID));
		String title = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(MediaColumns.TITLE));
		String artist = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(AudioColumns.ARTIST));
		String album = mediaCursor.getString(mediaCursor.getColumnIndexOrThrow(AudioColumns.ALBUM));
			
		ContentValues tData = data.get(album);
		String albumid = (String) tData.get(BaseColumns._ID);
		cursor.addRow(new String[] {id, title, artist, album, albumid});
          }
          mediaCursor.close();
      }
      
      if (cursor != null) {
          // Ensure the cursor window is filled
          registerContentObserver(cursor, mObserver);
      }
      return cursor;
  }