问Android 4.4中的快速滚动问题

EN

// Adds section popup for fast scroll
class NameListAdapter extends  SimpleAdapter implements SectionIndexer  {
    HashMap<String, Integer> alphaIndexer;
    private String[] sections;
    private ArrayList<String> sectionList;
    private List<HashMap<String, String>> data = null;

    public NameListAdapter (Context context, List<HashMap<String, String>> data, 
            int resource, String[] from, int[] to) {
        super(context, data, resource, from, to);
        alphaIndexer = new HashMap<String, Integer>();
        sectionList = new ArrayList<String>();
        this.data = data;
        int size = data.size();

        for (int i = 0; i < size; i++) {
            HashMap<String, String> myData = (HashMap <String, String>) data.get(i);
            // Get first character
            String ch = myData.get("name").substring(0, 1);
            // Convert character to upper case
            ch = ch.toUpperCase();

            // Put first char/index into our HashMap
            if (!alphaIndexer.containsKey(ch)) {
                alphaIndexer.put(ch, i);
                sectionList.add(ch);
            }
        }
        sections = new String[sectionList.size()];
        sectionList.toArray(sections);
    }

    @Override
    public int getPositionForSection(int section) {
        if (section >= sections.length) {
            return getCount() - 1;
        }

        return alphaIndexer.get(sections[section]);
    }

    @Override
    public int getSectionForPosition(int pos) {

        if (pos > data.size()) {
            return 0;
        }

        HashMap<String, String> myData = (HashMap <String, String>) data.get(pos);
        String ch = myData.get("name").substring(0, 1);
        // Convert character to upper case
        ch = ch.toUpperCase();

        for (int i = 0; i < sectionList.size(); i++) {
            if (sectionList.get(i).equals(ch)) {
                return i;
            }
        }
        return 0;

    }

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