以下是使用AlphabetIndexer的listview适配器类。 当我添加unicode chars（希伯来语）与英语一起使用时，它不起作用。 我在getSectionForPosition中遇到异常。得索引-1 .... 尝试在DB中使用2个条目 - 1以希伯来字符（unicode）开头，1个以英语开头。 AlphabetIndexer的第一个字符是unicode字符。 真的需要帮助......
public abstract class RecipeListViewAdapter extends SimpleCursorAdapter implements SectionIndexer
{
protected Context mContext;
protected Cursor mCursor;
private LayoutInflater mInflater;
public static final int TYPE_HEADER = 1;
public static final int TYPE_NORMAL = 0;
private static final int TYPE_COUNT = 2;
private AlphabetIndexer indexer;
private int[] usedSectionNumbers;
private Map<Integer, Integer> sectionToOffset;
private Map<Integer, Integer> sectionToPosition;
protected ImageLoader mImageLoader = new ImageLoader( MyApp.Instance() );
public RecipeListViewAdapter( Context context,
int layout,
Cursor c,
String[] from,
int[] to )
{
super(context, layout, c, from, to);
mContext = context;
mCursor = c;
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
indexer = new AlphabetIndexer(c, c.getColumnIndexOrThrow("NAME"), "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
sectionToPosition = new TreeMap<Integer, Integer>();
sectionToOffset = new HashMap<Integer, Integer>();
final int count = super.getCount();
int i;
for( i = count - 1 ; i >= 0; i-- )
{
sectionToPosition.put(indexer.getSectionForPosition(i), i);
}
i = 0;
usedSectionNumbers = new int[sectionToPosition.keySet().size()];
for( Integer section : sectionToPosition.keySet() )
{
sectionToOffset.put(section, i);
usedSectionNumbers[i] = section;
i++;
}
for(Integer section: sectionToPosition.keySet())
{
sectionToPosition.put(section, sectionToPosition.get(section) + sectionToOffset.get(section));
}
}
@Override
public int getCount()
{
if( super.getCount() != 0 )
{
return super.getCount() + usedSectionNumbers.length;
}
return 0;
}
@Override
public Object getItem(int position)
{
if (getItemViewType(position) == TYPE_NORMAL) //we define this function later
{
return super.getItem( GetItemPosition( position ) );
}
return null;
}
public int GetItemPosition( final int position )
{
return position - sectionToOffset.get(getSectionForPosition(position)) - 1;
}
public int getPositionForSection(int section) {
if (! sectionToOffset.containsKey(section)){
int i = 0;
int maxLength = usedSectionNumbers.length;
while (i < maxLength && section > usedSectionNumbers[i]){
i++;
}
if (i == maxLength) return getCount();
return indexer.getPositionForSection(usedSectionNumbers[i]) + sectionToOffset.get(usedSectionNumbers[i]);
}
return indexer.getPositionForSection(section) + sectionToOffset.get(section);
}
public int getSectionForPosition(int position) {
int i = 0;
int maxLength = usedSectionNumbers.length;
while (i < maxLength && position >= sectionToPosition.get(usedSectionNumbers[i])){
i++;
}
return usedSectionNumbers[i-1];
}
public Object[] getSections() {
return indexer.getSections();
}
//nothing much to this: headers have positions that the sectionIndexer manages.
@Override
public int getItemViewType(int position) {
if (position == getPositionForSection(getSectionForPosition(position))){
return TYPE_HEADER;
} return TYPE_NORMAL;
}
@Override
public int getViewTypeCount() {
return TYPE_COUNT;
}
@Override
public View getView( int position,
View convertView,
ViewGroup parent )
{
final int type = getItemViewType(position);
if (type == TYPE_HEADER)
{
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.header, parent, false);
}
((TextView)convertView.findViewById(R.id.header)).setText((String)getSections()[getSectionForPosition(position)]);
return convertView;
}
else
{
ViewHolder holder = new ViewHolder();
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.recipes_list_view_entry, null);
holder.name = (TextView) convertView.findViewById( R.id.name_entry );
holder.author = (TextView) convertView.findViewById( R.id.username_entry );
holder.ratingBar = (RatingBar) convertView.findViewById( R.id.list_RatingBarId );
holder.userRatingBar = (RatingBar) convertView.findViewById( R.id.list_userRatingBarId );
holder.diffculty = (ImageView) convertView.findViewById( R.id.list_DifficultyImageViewId );
holder.preparationTime = (ImageView) convertView.findViewById( R.id.list_TimeImageViewId );
holder.recipePic = new DisplayableImageView( (ImageView) convertView.findViewById( R.id.list_RecipeImageViewId ) );
holder.name.setTypeface( MyApp.Fonts.ARIAL );
holder.name.setTextSize( MyApp.Fonts.RUNNING_TEXT_SIZE );
holder.name.setTextColor( Color.BLACK );
}
else
{
holder = (ViewHolder) convertView.getTag();
}
if( super.getItem( GetItemPosition(position) ) != null )
{
// Check if single
if( getCount() == position+1 && position == 1 )
{
convertView.setBackgroundResource( R.drawable.list_single );
}
else if( getItemViewType(position-1) == TYPE_HEADER )
{
// Check if single item in the middle of the list
if( getItemViewType(position+1) == TYPE_HEADER )
{
convertView.setBackgroundResource( R.drawable.list_single );
}
else if( position == getCount() - 1 )
{
convertView.setBackgroundResource( R.drawable.list_single );
}
else
{
convertView.setBackgroundResource( R.drawable.list_up );
}
}
else
{
// Middle or bottom
convertView.setBackgroundResource( R.drawable.list_middle );
//If not last
if( getCount() != position + 1 )
{
// Check if middle or down
if( getItemViewType(position+1) == TYPE_HEADER )
{
convertView.setBackgroundResource( R.drawable.list_down );
}
else
{
convertView.setBackgroundResource( R.drawable.list_middle );
}
}
else
{
// If it is last - use list_down
convertView.setBackgroundResource( R.drawable.list_down );
}
}
FillRecipeDataToHolder( GetItemPosition(position), holder );
convertView.setTag(holder);
}
else
{
holder = (ViewHolder)convertView.getTag();
}
return convertView;
}
}
//these two methods just disable the headers
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEnabled(int position) {
if (getItemViewType(position) == TYPE_HEADER){
return false;
}
return true;
}
protected abstract void FillRecipeDataToHolder(int position, ViewHolder holder);
static class ViewHolder
{
TextView separator;
DisplayableImageView recipePic;
TextView name;
TextView author;
RatingBar ratingBar;
RatingBar userRatingBar;
ImageView diffculty;
ImageView preparationTime;
TextView serveCount;
}
}