public class MyListActivity extends ListActivity {
    private MyCursorAdapter adapter;
    private SQLiteDatabase db = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
            new RetrieveCursorTask(this).execute((Void[]) null);
        } catch (Exception e) {
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // Null out the cursor.
        if (adapter != null) {
            adapter.changeCursor(null);
            adapter = null;
        }

        if (db != null && db.isOpen()) {
            db.close();
        }
    }

    private class RetrieveCursorTask extends AsyncTask<Void, Void, Cursor> {
        private Context ctx;

        public RetrieveCursorTask(Context ctx) {
            this.ctx = ctx;
        }

        @Override
        protected Cursor doInBackground(Void... params) {
            Cursor cursor = null;
            DbHelper helper = new DbHelper(ctx);

            try {
                db = helper.getReadableDatabase();
                cursor = db.query("users",
                    new String[] {
                        DbHelper.ID_COLUMN,
                        DbHelper.UID_COLUMN
                    },
                    null, null, null, null, null);
                startManagingCursor(cursor);
            } catch (Exception e) {
            }
            return cursor;
        }

        @Override
        protected void onPostExecute(Cursor cursor) {
            super.onPostExecute(cursor);

            if (cursor != null) {
                try {
                    adapter = new MyCursorAdapter(ctx, cursor);
                } catch (Exception e) {
                }
                setListAdapter(adapter);
            }
        }
    }

    private class MyCursorAdapter extends CursorAdapter {
        private Context ctx;

        public MyCursorAdapter(Context context, Cursor c) {
            super(context, c);
            this.ctx = context;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            // ...
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            // ...
        }
    }
}

@Override
    protected void onPostExecute(Cursor cursor) {
        super.onPostExecute(cursor);

        synchronized(anyObject) {
        if (cursor != null) {
            try {
                adapter = new MyCursorAdapter(ctx, cursor);
            } catch (Exception e) {
            }
            setListAdapter(adapter);
        }
        }
    }