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

一切都像@vsm所描述的一样.