I forgot to instantiate alphaIndexer
. Works perfectly now.
class AlphabeticalAdapter extends ArrayAdapter<String> implements SectionIndexer
{
private HashMap<String, Integer> alphaIndexer;
private String[] sections;
public AlphabeticalAdapter(Context c, int resource, List<String> data)
{
super(c, resource, data);
alphaIndexer = new HashMap<String, Integer>();
for (int i = 0; i < data.size(); i++)
{
String s = data.get(i).substring(0, 1).toUpperCase();
if (!alphaIndexer.containsKey(s))
alphaIndexer.put(s, i);
}
Set<String> sectionLetters = alphaIndexer.keySet();
ArrayList<String> sectionList = new ArrayList<String>(sectionLetters);
Collections.sort(sectionList);
sections = new String[sectionList.size()];
for (int i = 0; i < sectionList.size(); i++)
sections[i] = sectionList.get(i);
}
public int getPositionForSection(int section)
{
return alphaIndexer.get(sections[section]);
}
public int getSectionForPosition(int position)
{
return 1;
}
public Object[] getSections()
{
return sections;
}
}