android.widget
Class BaseExpandableListAdapter

java.lang.Object
  android.widget.BaseExpandableListAdapter

All Implemented Interfaces:

ExpandableListAdapter

Direct Known Subclasses:

CursorTreeAdapter, SimpleExpandableListAdapter

public abstract class BaseExpandableListAdapter
extends Object
implements ExpandableListAdapter

Base class for a ExpandableListAdapter used to provide data and Views from some data to an expandable list view.

Adapters inheriting this class should verify that the base implementations of getCombinedChildId(long, long) and getCombinedGroupId(long) are correct in generating unique IDs from the group/children IDs.

See Also:

SimpleExpandableListAdapter, SimpleCursorTreeAdapter

Constructor Summary

BaseExpandableListAdapter()

Method Summary

boolean	areAllItemsEnabled()
long	getCombinedChildId(long groupId, long childId) Override this method if you foresee a clash in IDs based on this scheme:
long	getCombinedGroupId(long groupId) Override this method if you foresee a clash in IDs based on this scheme:
boolean	isEmpty()
void	notifyDataSetChanged() DataSetObservable.notifyChanged()
void	notifyDataSetInvalidated() DataSetObservable.notifyInvalidated()
void	onGroupCollapsed(int groupPosition) Called when a group is collapsed.
void	onGroupExpanded(int groupPosition) Called when a group is expanded.
void	registerDataSetObserver(DataSetObserver observer)
void	unregisterDataSetObserver(DataSetObserver observer)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface android.widget.ExpandableListAdapter

getChild, getChildId, getChildrenCount, getChildView, getGroup, getGroupCount, getGroupId, getGroupView, hasStableIds, isChildSelectable

Constructor Detail

BaseExpandableListAdapter

public BaseExpandableListAdapter()

Method Detail

registerDataSetObserver

public void registerDataSetObserver(DataSetObserver observer)

Specified by:

registerDataSetObserver in interface ExpandableListAdapter

See Also:

Adapter.registerDataSetObserver(DataSetObserver)

unregisterDataSetObserver

public void unregisterDataSetObserver(DataSetObserver observer)

Specified by:

unregisterDataSetObserver in interface ExpandableListAdapter

See Also:

Adapter.unregisterDataSetObserver(DataSetObserver)

notifyDataSetInvalidated

public void notifyDataSetInvalidated()

DataSetObservable.notifyInvalidated()

notifyDataSetChanged

public void notifyDataSetChanged()

DataSetObservable.notifyChanged()

areAllItemsEnabled

public boolean areAllItemsEnabled()

Specified by:

areAllItemsEnabled in interface ExpandableListAdapter

See Also:

ListAdapter.areAllItemsEnabled()

onGroupCollapsed

public void onGroupCollapsed(int groupPosition)

Description copied from interface: ExpandableListAdapter

Called when a group is collapsed.

Specified by:

onGroupCollapsed in interface ExpandableListAdapter

Parameters:

groupPosition - The group being collapsed.

onGroupExpanded

public void onGroupExpanded(int groupPosition)

Description copied from interface: ExpandableListAdapter

Called when a group is expanded.

Specified by:

onGroupExpanded in interface ExpandableListAdapter

Parameters:

groupPosition - The group being expanded.

getCombinedChildId

public long getCombinedChildId(long groupId,
                               long childId)

Override this method if you foresee a clash in IDs based on this scheme:

Base implementation returns a long:

bit 0: Whether this ID points to a child (unset) or group (set), so for this method this bit will be 0.

bit 1-31: Lower 31 bits of the groupId

bit 32-63: Lower 32 bits of the childId.

Gets an ID for a child that is unique across any item (either group or child) that is in this list. Expandable lists require each item (group or child) to have a unique ID among all children and groups in the list. This method is responsible for returning that unique ID given a child's ID and its group's ID. Furthermore, if ExpandableListAdapter.hasStableIds() is true, the returned ID must be stable as well.

Specified by:

getCombinedChildId in interface ExpandableListAdapter

Parameters:

groupId - The ID of the group that contains this child.

childId - The ID of the child.

Returns:

The unique (and possibly stable) ID of the child across all groups and children in this list.

getCombinedGroupId

public long getCombinedGroupId(long groupId)

Override this method if you foresee a clash in IDs based on this scheme:

Base implementation returns a long:

bit 0: Whether this ID points to a child (unset) or group (set), so for this method this bit will be 1.

bit 1-31: Lower 31 bits of the groupId

bit 32-63: Lower 32 bits of the childId.

Gets an ID for a group that is unique across any item (either group or child) that is in this list. Expandable lists require each item (group or child) to have a unique ID among all children and groups in the list. This method is responsible for returning that unique ID given a group's ID. Furthermore, if ExpandableListAdapter.hasStableIds() is true, the returned ID must be stable as well.

Specified by:

getCombinedGroupId in interface ExpandableListAdapter

Parameters:

groupId - The ID of the group

Returns:

The unique (and possibly stable) ID of the group across all groups and children in this list.

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface ExpandableListAdapter

See Also:

Adapter.isEmpty()