i have almost the same situation as you, but the way i do it is a
little different --
when a list item view is made or recycled, it checks to see whether
its image is loaded or not. if it's not, it kicks off an AsyncTask
whose job it is to grab it using its URL. when that completes, it
calls the list item view back again and that in turn inflates the
bitmap and setImageBitmap() on the appropriate image view.
have to keep track of the view being recycled while the task is
ongoing etc, but that awkwardness aside, this system seems to work ok.
>Hi,
>
>I have a ListView, its rows each have an image downloaded from the net
>in a separate thread.
>
>When the image is done downloading, I notify my main thread, and need
>to invalidate the corresponding row if it's on screen. I'm doing this:
>
> // run on the main thread.
> public void onThumbnailDownloaded(String url, Bitmap bmp) {
> for (int i = 0; i < mListView.getChildCount(); i++) {
> PanelMyRow panel = (PanelMyRow)mListView.getChildAt(i);
> if (panel.getUrl().equals(url)) {
> panel.getImageView().setImageBitmap(bmp);
> break;
> }
> }
> }
>
>this seems to work ok. Ideally though, I think it'd be better if I
>could somehow trigger my adapter to call its getView() method for this
>'dirty' row. I can't find a method within ListView or BaseAdapter to
>do this. Calling any of the invalidate methods has no effect, and any
>of these:
>
> ListView.invalidateViews()
> BaseAdapter.notifyDatasetInvalidated();
> BaseAdapter.notifyDatasetChanged();
>
>seem pretty heavyweight and my ListView scrolling will be very choppy
>if the images are still downloading and one of the above three is
>called during the callback. Is there some way I can simply mark the
>child view as dirty which notifies the ListView that it should call
>getView() on the adapter for that row again? Seems safer.
>
>Thanks
>
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