问ListView和ToggleButton

EN

public class RSSFeedItemListAdapter extends ArrayAdapter<RSSItem> {

    private Context context;
    private List<RSSItem> items;
    private int resource;
    private Podcast podcast;
    private boolean[] playpauseState;

    public RSSFeedItemListAdapter(Context context, int resource, List<RSSItem> items, Podcast podcast) {
        super(context, resource, items);
        this.items = items;
        this.context = context;
        this.resource = resource;
        this.podcast = podcast;
        playpauseState = new boolean[this.items.size()];
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        Viewholder vh;
        if (convertView == null) {

            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(resource, parent, false);

            Typeface custom_font = Typeface.createFromAsset(context.getAssets(), "fonts/RobotoCondensed-Bold.ttf");
            vh = new Viewholder();
            vh.title = (TextView) convertView.findViewById(R.id.podcast_feeditem_title);
            vh.title.setTypeface(custom_font);
            vh.desc = (TextView) convertView.findViewById(R.id.podcast_feeditem_description);
            vh.image = (ImageView) convertView.findViewById(R.id.podcast_feeditem_image);
            vh.pubDate = (TextView) convertView.findViewById(R.id.podcast_feeditem_pubdate);
            vh.collectionName = (TextView) convertView.findViewById(R.id.podcast_feeditem_collection_name);
            vh.playpause = (ToggleButton) convertView.findViewById(R.id.podcast_feeditem_play_pause_cta);
            vh.playpause.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    int position = (Integer) buttonView.getTag();
                    playpauseState[position] = isChecked;
                }
            });
            convertView.setTag(vh);
        } else {
            vh = (Viewholder) convertView.getTag();
        }

        vh.playpause.setChecked(playpauseState[position]);
        vh.playpause.setTag(position);


        RSSItem rssItem = items.get(position);
        vh.title.setText(rssItem.getTitle());
        vh.desc.setText(Jsoup.parse(rssItem.getDescription()).text());
        Picasso.with(context).load(podcast.getArtworkExtraLarge()).into(vh.image);

        // TODO detect the local and show the right format
        // TODO the date format should match the date format from the rssfeedhandler code
        if (rssItem.getPubDate() != null) {
            vh.pubDate.setText(vh.simpleDateFormat.format(rssItem.getPubDate()));
        }

        // vh.playpause.setChecked(playpauseState[position]);
        vh.collectionName.setText(podcast.getCollectionName());
        return convertView;
    }


    /**
     *
     */
    static class Viewholder {
        ImageView image;
        TextView title;
        TextView desc;
        TextView pubDate;
        TextView collectionName;
        ToggleButton playpause;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d MMM", Locale.UK);

    }