自定义 ListView 的滚动问题

Question

我创建了一个从数据库加载数据的自定义列表视图。然后将这些数据放入一个数组中。

我可以让所有数据显示在列表视图中应该显示的位置。所以那里没有问题。 我遇到的问题是滚动。当我浏览列表视图时，它似乎运行缓慢。

以下是我的代码摘录：

static class ViewHolder {
    public TextView txtTitle;
    public TextView txtDescription;
    public TextView txtLocations;
    public TextView txtShowingDate;
    public TextView txtAdded;
    public TextView txtProvider;
    public TextView txtTicketUrl;
    public ImageView imgProviderImage;
    }

public class FilmItemAdapter extends ArrayAdapter<FilmRecord> {
    public ArrayList<FilmRecord> films;

    public FilmItemAdapter(Context context, int textViewResourceId, ArrayList<FilmRecord> films) {
        super(context, textViewResourceId, films);
        this.films = films;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder = new ViewHolder();
        if (convertView == null) {
            /* There is no view at this position, we create a new one. 
               In this case by inflating an xml layout */
            LayoutInflater inflater = LayoutInflater.from(getContext());
            convertView = inflater.inflate(R.layout.listitem, null);

            // Creates a ViewHolder and store references to the two children views
            // we want to bind data to.
            //Find find by ID once, and store details in holder.
            viewHolder.txtTitle = (TextView)convertView.findViewById(R.id.filmtitle);
            viewHolder.txtShowingDate = (TextView) convertView.findViewById(R.id.filmshowingtime);
            viewHolder.txtAdded = (TextView) convertView.findViewById(R.id.filmadded);
            viewHolder.txtLocations = (TextView) convertView.findViewById(R.id.filmlocations);
            viewHolder.txtDescription = (TextView) convertView.findViewById(R.id.filmdescription);
            viewHolder.txtProvider = (TextView) convertView.findViewById(R.id.filmprovider);
            viewHolder.txtTicketUrl = (TextView) convertView.findViewById(R.id.filmticketurl);
            viewHolder.imgProviderImage = (ImageView) convertView.findViewById(R.id.providerImage);

            convertView.setTag(viewHolder);
        } else {
             /* We recycle a View that already exists */
            viewHolder = (ViewHolder) convertView.getTag();
        }

        FilmRecord film = films.get(position);

        //Get film details from ARRAY and not the database - getting records from a db is time consuming.
        viewHolder.txtTitle.setText(films.get(position).filmTitle);
        viewHolder.txtDescription.setText(films.get(position).filmDescription);
        viewHolder.txtLocations.setText(films.get(position).filmLocations);
        viewHolder.txtShowingDate.setText("Showing time: " + films.get(position).filmShowingDate);
        viewHolder.txtAdded.setText("Added on: " + films.get(position).filmAdded);
        viewHolder.txtProvider.setText(films.get(position).filmProvider);
        viewHolder.txtTicketUrl.setText(films.get(position).filmTicketUrl);

        return convertView;

    }

}

这方面的帮助会很棒:)

Answer 1

这可能会对您有所帮助： example from the API demos