带有AlphabetIndexer的SectionIndexer卡在K.

Question

我的listfragment有一个实现CursorAdapter的自定义SectionIndexer。我使用AlphabetIndexer助手类以简单的标准方式实现SectionIndexer。但由于某些原因，在滚动时，滚动中的字符从K变为R，跳过其间的所有字母。因此，即使有数十个条目以L，M，N，O，P，Q开头，它们都在K部分下面。如果我从AlphabetIndexer的alphabet参数中删除K，则相同的行为仍然存在于L知道为什么会这样吗？

private class ContactsAdapter extends CursorAdapter implements SectionIndexer {
private AlphabetIndexer mAlphabetIndexer; // Stores the AlphabetIndexer instance
...
public ContactsAdapter(Context context) {
...
final String alphabet = context.getString(R.string.alphabet); // alphabet=" ABCDEFGHIJKLMNOPQRSTUVWXYZ"
mAlphabetIndexer = new AlphabetIndexer(null, ContactsQuery.SORT_KEY, alphabet);

/**
         * An override of getCount that simplifies accessing the Cursor. If the Cursor is null,
         * getCount returns zero. As a result, no test for Cursor == null is needed.
         */
        @Override
        public int getCount() {
            if (getCursor() == null) {
                return 0;
            }
            return super.getCount();
        }

        @Override
        public Cursor swapCursor(Cursor newCursor) {
            // Update the AlphabetIndexer with new cursor as well
            mAlphabetIndexer.setCursor(newCursor);
            return super.swapCursor(newCursor);
        }

        @Override
        public Object[] getSections() {
            return mAlphabetIndexer.getSections();
        }

        /**
         * Defines the SectionIndexer.getPositionForSection() interface.
         */
        @Override
        public int getPositionForSection(int i) {
            if (getCursor() == null) {
                return 0;
            }
            return mAlphabetIndexer.getPositionForSection(i);
        }

        /**
         * Defines the SectionIndexer.getSectionForPosition() interface.
         */
        @Override
        public int getSectionForPosition(int i) {
            if (getCursor() == null) {
                return 0;
            }
            return mAlphabetIndexer.getSectionForPosition(i);
        }


}

}