void setListAdapterOverride() {
    String[] fromColumns = new String[] {
            AudioColumns.ARTIST,
            MediaColumns.TITLE,
            AudioColumns.ALBUM,
            AudioColumns.ALBUM_ID
    };
    int[] toColumns = new int[] {
            R.id.tv_artist,
            R.id.tv_title,
            R.id.tv_album,
            R.id.iv_albumArt
    };
    cursorAdapter = new customAdapter(getBaseContext(), R.layout.listviewitem, cursor, fromColumns, toColumns);
    setListAdapter(cursorAdapter);
    if (MyDebug.Log)
        Log.d("Activity", "ListAdapter gesetzt");
}

class customAdapter extends SimpleCursorAdapter {

    int layout;
    Cursor cursor;
    String[] from;
    int[] to;

    public customAdapter(Context context, int layout, Cursor c,
            String[] from, int[] to) {
        super(context, layout, c, from, to);
        this.layout = layout;
        this.cursor = c;
        this.from = from;
        this.to = to;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        if (row == null) {
            LayoutInflater inflater = getLayoutInflater();
            row = inflater.inflate(R.layout.listviewitem, parent, false);
            if (MyDebug.Log)
                Log.d("Activity", "Inflate");
        }
        cursor.moveToPosition(position);
        TextView artist = (TextView) row.findViewById(to[0]);
        TextView title = (TextView) row.findViewById(to[1]);
        TextView album = (TextView) row.findViewById(to[2]);
        ImageView albumArt = (ImageView) row.findViewById(to[3]);
        artist.setText(cursor.getString(cursor.getColumnIndex(from[0])));
        title.setText(cursor.getString(cursor.getColumnIndex(from[1])));
        album.setText(cursor.getString(cursor.getColumnIndex(from[2])));

        Cursor albumArtCursor = contentResolver.query(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Audio.Albums._ID, MediaStore.Audio.Albums.ALBUM_ART }, MediaStore.Audio.Albums._ID + "='" + cursor.getInt(cursor.getColumnIndex(from[3])) + "'", null, null);
        albumArtCursor.moveToFirst();
        String albumArtUri = albumArtCursor.getString(albumArtCursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART));
        if (albumArtUri == null) albumArtUri = "default";
        if (!imageCache.containsKey(albumArtUri)) {
            Bitmap albumArtBitmap;
            if (!albumArtUri.equals("default")) {
                Options opts = new Options();
                opts.inJustDecodeBounds = true;
                BitmapFactory.decodeFile(albumArtUri, opts);
                Integer[] bitmapSize = new Integer[] { opts.outWidth, opts.outHeight };
                Integer scaleFactor = 1;
                while ((bitmapSize[0]/2 > 50) && (bitmapSize[1]/2 > 50)) {
                    scaleFactor++;
                    bitmapSize[0] /= 2;
                    bitmapSize[1] /= 2;
                }
                opts = new Options();
                opts.inSampleSize = scaleFactor;
                albumArtBitmap = BitmapFactory.decodeFile(albumArtUri, opts);
            } else {
                albumArtBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_mp_song_list);
            }
            imageCache.put(albumArtUri, albumArtBitmap);
        }
        albumArt.setImageBitmap(imageCache.get(albumArtUri));
        return row;
    }
}