Added in API level 1

Summary: Methods

ExpandableListAdapter

Kotlin |Java

public interface ExpandableListAdapter

android.widget.ExpandableListAdapter

Known indirect subclasses

BaseExpandableListAdapter, CursorTreeAdapter, ResourceCursorTreeAdapter, SimpleCursorTreeAdapter, SimpleExpandableListAdapter

BaseExpandableListAdapter	Base class for a `ExpandableListAdapter` used to provide data and Views from some data to an expandable list view.
CursorTreeAdapter	An adapter that exposes data from a series of `Cursor`s to an `ExpandableListView` widget.
ResourceCursorTreeAdapter	A fairly simple ExpandableListAdapter that creates views defined in an XML file.
SimpleCursorTreeAdapter	An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file.
SimpleExpandableListAdapter	An easy adapter to map static data to group and child views defined in an XML file.

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.

Summary

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`	`isEmpty()`
`abstract void`	`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)`

Public methods

areAllItemsEnabled

Added in API level 1

public abstract boolean areAllItemsEnabled ()

Returns
`boolean`

See also:

ListAdapter.areAllItemsEnabled()

getChild

Added in API level 1

public abstract 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

getChildId

Added in API level 1

public abstract 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

getChildView

Added in API level 1

public 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.

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, android.view.View, android.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

getChildrenCount

Added in API level 1

public abstract 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

getCombinedChildId

Added in API level 1

public 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. 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.

getCombinedGroupId

Added in API level 1

public 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. 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.

getGroup

Added in API level 1

public abstract 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

getGroupCount

Added in API level 1

public abstract int getGroupCount ()

Gets the number of groups.

Returns
`int`	the number of groups

getGroupId

Added in API level 1

public abstract 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

getGroupView

Added in API level 1

public abstract 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, android.view.View, android.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, android.view.View, android.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

hasStableIds

Added in API level 1

public abstract 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:

Adapter.hasStableIds()

isChildSelectable

Added in API level 1

public abstract 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.

isEmpty

Added in API level 1

public abstract boolean isEmpty ()

Returns
`boolean`

See also:

Adapter.isEmpty()

onGroupCollapsed

Added in API level 1

public abstract void onGroupCollapsed (int groupPosition)

Called when a group is collapsed.

Parameters
`groupPosition`	`int`: The group being collapsed.

onGroupExpanded

Added in API level 1

public abstract void onGroupExpanded (int groupPosition)

Called when a group is expanded.

Parameters
`groupPosition`	`int`: The group being expanded.

registerDataSetObserver

Added in API level 1

public abstract void registerDataSetObserver (DataSetObserver observer)

Parameters
`observer`	`DataSetObserver`

See also:

Adapter.registerDataSetObserver(DataSetObserver)

unregisterDataSetObserver

Added in API level 1

public abstract void unregisterDataSetObserver (DataSetObserver observer)

Parameters
`observer`	`DataSetObserver`

See also:

Adapter.unregisterDataSetObserver(DataSetObserver)