The icons aren't the issue - I've tried turning them off and it has no
effect. I've encountered a similar scrolling issue with a custom ListAdapter
extending BaseAdapter I wrote a while ago, and it was caused by not properly
setting the view's values in getView() I resolved it using the fix posted
at
http://stackoverflow.com/questions/1320478/how-to-load-the-listview-smoothly-in-android,
but I'm not really sure how to implement that fix when I'm using a stock
SimpleCursorAdapter, or if that fix even applies to this situation.
On Fri, Jul 23, 2010 at 12:43 PM, Joseph Earl <joseph.w.e...@gmail.com>wrote:
> For images loading from your drawable folder you shouldn't have too
> much of a problem and there isn't too much you can do about it (apart
> from perhaps not load any thumbnails while the user is scrolling - as
> per the Contacts app on 2.1+)
>
> For HTTP images, and possibly images from the SD card depending on how
> large your thumbnails are, you'll want to
> a) Load them in a separate thread, and
> b) Not load any while the user is scrolling
>
> On Jul 23, 8:14 pm, Mark Murphy <mmur...@commonsware.com> wrote:
> > Try getting rid of the icons briefly. If scrolling speed improves
> > dramatically, then the problem is in your icons. This would
> > particularly be true if the values you are trying to put into the
> > ImageView are HTTP URLs or something.
> >
> >
> >
> > On Fri, Jul 23, 2010 at 3:10 PM, QR <qro...@gmail.com> wrote:
> > > I'm getting some very jerky scrolling while using the code below to
> > > create a ListView from a Cursor. Is there something I'm doing wrong,
> > > or any way to improve the performance of this ListView?
> >
> > > bookmarksListView = (ListView)findViewById(R.id.bookmarks_listview);
> > > bookmarksDbCursor = bookmarkStore.getCursor();
> > > startManagingCursor(bookmarksDbCursor);
> > > String[] bookmarksColumns = new String[3];
> > > bookmarksColumns[0] = "TITLE";
> > > bookmarksColumns[1] = "URL";
> > > bookmarksColumns[2] = "ICONID";
> > > int[] bookmarksViews = new int[3];
> > > bookmarksViews[0] = R.id.title_text;
> > > bookmarksViews[1] = R.id.subtitle_text;
> > > bookmarksViews[2] = R.id.icon_view;
> > > bookmarksListAdapter = new
> SimpleCursorAdapter(this,
> > > R.layout.list_item,
> > > bookmarksDbCursor,
> > > bookmarksColumns,
> > > bookmarksViews);
> > >
> bookmarksListView.setAdapter(bookmarksListAdapter);
> > > bookmarksListView.setOnItemClickListener(new
> OnItemClickListener()
> > > {
> > > @Override
> > > public void onItemClick(AdapterView<?>
> parent, View view,
> > > int position, long id) {
> > >
> Toast.makeText(BookmarkHistoryTabActivity.this, "Clicked ID " +
> > > Long.toString(id), Toast.LENGTH_SHORT).show();
> > > }
> > > });
> > > registerForContextMenu(bookmarksListView);
> >
> > > Note: bookmarkStore.getCursor() returns an unmanaged cursor from a
> > > sqlite database containing the columns from bookmarksColumns.
> >
> > --
> > Mark Murphy (a Commons Guy)http://commonsware.com|
> http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
> >
> > Android Development Wiki:http://wiki.andmob.org
>
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