Question

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.

The icons I’m loading (from R.drawable) 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
How to load the Listview "smoothly" in android…,
but that was for a custom adapter class, and 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.

EDIT: The query returning info on the database looks like this, in case that helps:

public Cursor getCursor() {
            openDB();
            Cursor c = mDB.query(DB_TABLENAME, new String[]{"_id", "ICONID", "DATE", "TITLE", "URL"}, null, null, null, null,"DATE DESC");
            return c;
    }

EDIT2: I have no idea why, but this behavior only occurs in android 1.6+ I’ve tried changing my query, removing the sorting, etc. for my cursor, nothing seems to help. The database is very small (<20 items) and only contains the columns present in the query above.

Answer 1

We’ve determined that this is an issue with Android versions 1.6+, rather than our code, and are leaving it as-is.