public
interface
ExpandableListAdapter
| android.widget.ExpandableListAdapter |
 Known Indirect Subclasses
|
An adapter that links a ExpandableListView with the underlying
data. The implementation of this interface will provide access
to the data of the children (categorized by groups), and also instantiate
Views for children and groups.
Public methods | |
|---|---|
abstract
boolean
|
areAllItemsEnabled()
|
abstract
Object
|
getChild(int groupPosition, int childPosition)
Gets the data associated with the given child within the given group. |
abstract
long
|
getChildId(int groupPosition, int childPosition)
Gets the ID for the given child within the given group. |
abstract
View
|
getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
Gets a View that displays the data for the given child within the given group. |
abstract
int
|
getChildrenCount(int groupPosition)
Gets the number of children in a specified group. |
abstract
long
|
getCombinedChildId(long groupId, long childId)
Gets an ID for a child that is unique across any item (either group or child) that is in this list. |
abstract
long
|
getCombinedGroupId(long groupId)
Gets an ID for a group that is unique across any item (either group or child) that is in this list. |
abstract
Object
|
getGroup(int groupPosition)
Gets the data associated with the given group. |
abstract
int
|
getGroupCount()
Gets the number of groups. |
abstract
long
|
getGroupId(int groupPosition)
Gets the ID for the group at the given position. |
abstract
View
|
getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
Gets a View that displays the given group. |
abstract
boolean
|
hasStableIds()
Indicates whether the child and group IDs are stable across changes to the underlying data. |
abstract
boolean
|
isChildSelectable(int groupPosition, int childPosition)
Whether the child at the specified position is selectable. |
abstract
boolean
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isEmpty()
|
abstract
void
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onGroupCollapsed(int groupPosition)
Called when a group is collapsed. |
abstract
void
|
onGroupExpanded(int groupPosition)
Called when a group is expanded. |
abstract
void
|
registerDataSetObserver(DataSetObserver observer)
|
abstract
void
|
unregisterDataSetObserver(DataSetObserver observer)
|
Object getChild (int groupPosition, int childPosition)
Gets the data associated with the given child within the given group.
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group that the child resides in |
childPosition |
int:
the position of the child with respect to other
children in the group |
| Returns | |
|---|---|
Object |
the data of the child |
Developers
long getChildId (int groupPosition,
int childPosition)
Gets the ID for the given child within the given group. This ID must be
unique across all children within the group. The combined ID (see
getCombinedChildId(long, long)) must be unique across ALL items
(groups and all children).
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group that contains the child |
childPosition |
int:
the position of the child within the group for which
the ID is wanted |
| Returns | |
|---|---|
long |
the ID associated with the child |
View getChildView (int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
Gets a View that displays the data for the given child within the given group.
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group that contains the child |
childPosition |
int:
the position of the child (for which the View is
returned) within the group |
isLastChild |
boolean:
Whether the child is the last child within the group |
convertView |
View:
the old view to reuse, if possible. You should check
that this view is non-null and of an appropriate type before
using. If it is not possible to convert this view to display
the correct data, this method can create a new view. It is not
guaranteed that the convertView will have been previously
created by
getChildView(int, int, boolean, View, ViewGroup). |
parent |
ViewGroup:
the parent that this view will eventually be attached to |
| Returns | |
|---|---|
View |
the View corresponding to the child at the specified position |
int getChildrenCount (int groupPosition)
Gets the number of children in a specified group.
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group for which the children
count should be returned |
| Returns | |
|---|---|
int |
the children count in the specified group |
long getCombinedChildId (long groupId,
long 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 hasStableIds() is true, the
returned ID must be stable as well.
| Parameters | |
|---|---|
groupId |
long:
The ID of the group that contains this child. |
childId |
long:
The ID of the child. |
| Returns | |
|---|---|
long |
The unique (and possibly stable) ID of the child across all groups and children in this list. |
long getCombinedGroupId (long groupId)
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 hasStableIds() is true, the returned ID must be
stable as well.
| Parameters | |
|---|---|
groupId |
long:
The ID of the group |
| Returns | |
|---|---|
long |
The unique (and possibly stable) ID of the group across all groups and children in this list. |
Object getGroup (int groupPosition)
Gets the data associated with the given group.
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group |
| Returns | |
|---|---|
Object |
the data child for the specified group |
int getGroupCount ()
Gets the number of groups.
| Returns | |
|---|---|
int |
the number of groups |
long getGroupId (int groupPosition)
Gets the ID for the group at the given position. This group ID must be
unique across groups. The combined ID (see
getCombinedGroupId(long)) must be unique across ALL items
(groups and all children).
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group for which the ID is wanted |
| Returns | |
|---|---|
long |
the ID associated with the group |
View getGroupView (int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
Gets a View that displays the given group. This View is only for the
group--the Views for the group's children will be fetched using
getChildView(int, int, boolean, View, ViewGroup).
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group for which the View is
returned |
isExpanded |
boolean:
whether the group is expanded or collapsed |
convertView |
View:
the old view to reuse, if possible. You should check
that this view is non-null and of an appropriate type before
using. If it is not possible to convert this view to display
the correct data, this method can create a new view. It is not
guaranteed that the convertView will have been previously
created by
getGroupView(int, boolean, View, ViewGroup). |
parent |
ViewGroup:
the parent that this view will eventually be attached to |
| Returns | |
|---|---|
View |
the View corresponding to the group at the specified position |
boolean hasStableIds ()
Indicates whether the child and group IDs are stable across changes to the underlying data.
| Returns | |
|---|---|
boolean |
whether or not the same ID always refers to the same object |
See also:
boolean isChildSelectable (int groupPosition,
int childPosition)
Whether the child at the specified position is selectable.
| Parameters | |
|---|---|
groupPosition |
int:
the position of the group that contains the child |
childPosition |
int:
the position of the child within the group |
| Returns | |
|---|---|
boolean |
whether the child is selectable. |
void onGroupCollapsed (int groupPosition)
Called when a group is collapsed.
| Parameters | |
|---|---|
groupPosition |
int:
The group being collapsed.
|
void onGroupExpanded (int groupPosition)
Called when a group is expanded.
| Parameters | |
|---|---|
groupPosition |
int:
The group being expanded.
|
void registerDataSetObserver (DataSetObserver observer)
| Parameters | |
|---|---|
observer |
DataSetObserver
|
See also:
void unregisterDataSetObserver (DataSetObserver observer)
| Parameters | |
|---|---|
observer |
DataSetObserver
|