SectionIndexerpublic interface SectionIndexer | Interface that may implemented on {@link Adapter}s to enable fast scrolling
between sections of an {@link AbsListView}.
A section is a group of list items that have something in common. For
example, they may begin with the same letter or they may be songs from the
same artist.
{@link ExpandableListAdapter}s that consider groups and sections as
synonymous should account for collapsed groups and return an appropriate
section/position. |
| Methods Summary |
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| public int | getPositionForSection(int sectionIndex)Given the index of a section within the array of section objects, returns
the starting position of that section within the adapter.
If the section's starting position is outside of the adapter bounds, the
position must be clipped to fall within the size of the adapter.
| | public int | getSectionForPosition(int position)Given a position within the adapter, returns the index of the
corresponding section within the array of section objects.
If the section index is outside of the section array bounds, the index
must be clipped to fall within the size of the section array.
For example, consider an indexer where the section at array index 0
starts at adapter position 100. Calling this method with position 10,
which is before the first section, must return index 0.
| | public java.lang.Object[] | getSections()Returns an array of objects representing sections of the list. The
returned array and its contents should be non-null.
The list view will call toString() on the objects to get the preview text
to display while scrolling. For example, an adapter may return an array
of Strings representing letters of the alphabet. Or, it may return an
array of objects whose toString() methods return their section titles.
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