AlphabetIndexer with Custom Adapter

Question

Can someone show me an example of how to use AlphabetIndexer with a Custom Adapter that uses a getView? I have it working with a standard adapter,

Answer 1

Hi this is how I use AlphaIndexer

private final class ContactListItemAdapter extends ResourceCursorAdapter
        implements SectionIndexer {
    AlphabetIndexer alphaIndexer;

    public ContactListItemAdapter(Context context, int layout, Cursor c) {
        super(context, layout, c);
        alphaIndexer = new AlphabetIndexer(c, NAME_COLUMN_INDEX,
                " ABCDEFGHIJKLMNOPQRSTUVWXYZ");
    }   

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
            .... 
            a normal getView
            ....
    }  

    public int getPositionForSection(int section) {
        return alphaIndexer.getPositionForSection(section);
    }

    public int getSectionForPosition(int position) {
        return alphaIndexer.getSectionForPosition(position);
    }

    public Object[] getSections() {
        return alphaIndexer.getSections();
    }
}

NAME_COLUMN_INDEX is the index of the column in database schema.

...

If this is not what you need, please add some code about which should be the class to extend and so on.

Anyway I hope this helps.

Answer 2

If you're using a LoaderManager to manage your adapter's cursor, you'll want to make a small adjustment and override your adapters swapCursor method:

public Cursor swapCursor(Cursor c) {
    // Create our indexer
    if (c != null) {
        mIndexer = new AlphabetIndexer(c, c.getColumnIndex(Books.TITLE),
                " ABCDEFGHIJKLMNOPQRSTUVWXYZ");
     }
     return super.swapCursor(c);
 }

Everything else remains just as @vsm describes.