Hi,
i've used the holder method, but adding or omitting this didn;t give
me an increase or decrease in performance, my getView method is below:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid
unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
holder = new ViewHolder();
// When convertView is not null, we can reuse it directly,
there is no need
// to reinflate it. We only inflate a new View when the
convertView supplied
// by ListView is null.
if (convertView == null){
convertView = mInflater.inflate(R.layout.article_row,
null);
// Creates a ViewHolder and store references to the two
children views
// we want to bind data to.
holder.titleText = (TextView)
convertView.findViewById(R.id.article_title);
holder.descriptionText = (TextView)
convertView.findViewById(R.id.article_description);
holder.icon = (ImageView)
convertView.findViewById(R.id.article_thumb);
convertView.setTag(holder);
} else {
// get holder back...much faster than inflate
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.titleText.setText(Html.fromHtml(((FeedMessage)Items.get(position)).getTitle()));
holder.descriptionText.setText(Html.fromHtml(((FeedMessage)Items.get(position)).getDescription()));
Drawable d = null;
FeedMessage fm = (FeedMessage) Items.get(position);
if(fm.getEnclosures().size() > 0){
String urlString = fm.getEnclosures().get(0);
dm.fetchDrawableOnThread(urlString, holder.icon);
} else {
d =
_context.getResources().getDrawable(R.drawable.thumb_holder);
holder.icon.setImageDrawable(d);
}
if(fm.getGuid() != null){
convertView.setId(position);
}
return convertView;
}
static class ViewHolder {
TextView descriptionText;
TextView titleText;
ImageView icon;
}
regards,
Patrick
2010/1/6 Vince <specialized...@gmail.com>:
> What does your getView code look like. Are re-inflating your row view
> every time it's called, are there multiple views for the rows etc?
>
> Vince
>
> On Jan 6, 10:18 am, Patrick Plaatje <patrick.plaa...@ndcvbk.nl> wrote:
>> Hi all,
>>
>> for my app i'm using a listview to display rss news articles. All goes
>> well, and the implementation is almost done. But when using my app,
>> i'm not really satisfied with the "smoothness" and user experience of
>> it. The main problem is that when i scroll through the listview, which
>> contains an image for each row in the listview, the scrolling isn;t
>> smooth, it executes the getview override every time. I already threw
>> out the "holder startegy", as it slowed the scrolling...
>>
>> any thoughts?
>>
>> Thanx,
>>
>> Patrick
>
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