Is there any way that this could be a problem in the database rather than
the listview? My query looks like this:
Cursor c = mDB.query(DB_TABLENAME, new String[]{"_id", "ICONID", "DATE",
"TITLE", "URL"}, null, null, null, null,"DATE DESC");On Fri, Jul 23, 2010 at 12:59 PM, Quinn Rohlf <[email protected]> wrote: > 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 <[email protected]>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 <[email protected]> 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 <[email protected]> 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<http://github.com/commonsguyhttp://commonsware.com/blog%7Chttp://twitter.com/commonsguy> >> > >> > Android Development Wiki:http://wiki.andmob.org >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Android Developers" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected]<android-developers%[email protected]> >> For more options, visit this group at >> http://groups.google.com/group/android-developers?hl=en >> > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
