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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