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Added in API level 1
Summary: Methods | [Expand All]

ExpandableListAdapter

public interface ExpandableListAdapter

android.widget.ExpandableListAdapter
Known Indirect Subclasses

将ExpandableListView与底层数据链接的适配器。 该界面的实施将提供对儿童数据的访问（按组分类），并为儿童和团体实例化View 。

Summary

Public methods
abstract boolean areAllItemsEnabled()
abstract Object getChild(int groupPosition, int childPosition)

获取给定组内给定孩子的相关数据。
abstract long getChildId(int groupPosition, int childPosition)

获取给定组内给定孩子的ID。
abstract View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent)

获取一个View，显示给定组中给定子的数据。
abstract int getChildrenCount(int groupPosition)

获取指定组中的子项数。
abstract long getCombinedChildId(long groupId, long childId)

获取此列表中任何项目（组或子项）上唯一的子项的ID。
abstract long getCombinedGroupId(long groupId)

获取此列表中任何项目（组或子项）上唯一的组的ID。
abstract Object getGroup(int groupPosition)

获取与给定组关联的数据。
abstract int getGroupCount()

获取组的数量。
abstract long getGroupId(int groupPosition)

获取给定位置的组的ID。
abstract View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)

获取显示给定组的视图。
abstract boolean hasStableIds()

指示在对基础数据进行更改时，子ID和组ID是否稳定。
abstract boolean isChildSelectable(int groupPosition, int childPosition)

是否可以选择指定位置的孩子。
abstract boolean isEmpty()
abstract void onGroupCollapsed(int groupPosition)

当一个组被折叠时调用。
abstract void onGroupExpanded(int groupPosition)

当一个组被扩展时调用。
abstract void registerDataSetObserver(DataSetObserver observer)
abstract void unregisterDataSetObserver(DataSetObserver observer)

Public methods

areAllItemsEnabled

Added in API level 1 
boolean areAllItemsEnabled ()

Returns
boolean

也可以看看：

getChild

Added in API level 1 
Object getChild (int groupPosition, 
                int childPosition)

获取给定组内给定孩子的相关数据。

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 
long getChildId (int groupPosition, 
                int childPosition)

获取给定组内给定孩子的ID。 该ID在组内所有孩子中必须是唯一的。 合并的ID（请参阅getCombinedChildId(long, long) ）在所有项目（组和所有子项）中必须是唯一的。

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 
View getChildView (int groupPosition, 
                int childPosition, 
                boolean isLastChild, 
                View convertView, 
                ViewGroup parent)

获取一个View，显示给定组中给定子的数据。

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

getChildrenCount

Added in API level 1 
int getChildrenCount (int groupPosition)

获取指定组中的子项数。

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 
long getCombinedChildId (long groupId, 
                long childId)

获取此列表中任何项目（组或子项）上唯一的子项的ID。 展开式列表要求每个项目（组或小孩）在列表中的所有子项和组中都有唯一的ID。 此方法负责返回给定孩子ID和组ID的唯一ID。 此外，如果hasStableIds()为真，则返回的ID也必须稳定。

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 
long getCombinedGroupId (long groupId)

获取此列表中任何项目（组或子项）上唯一的组的ID。 展开式列表要求每个项目（组或小孩）在列表中的所有子项和组中都有唯一的ID。 该方法负责返回给定组ID的唯一ID。 此外，如果hasStableIds()为真，则返回的ID也必须稳定。

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 
Object getGroup (int groupPosition)

获取与给定组关联的数据。

Parameters
groupPosition int: the position of the group
Returns
Object the data child for the specified group

getGroupCount

Added in API level 1 
int getGroupCount ()

获取组的数量。

Returns
int the number of groups

getGroupId

Added in API level 1 
long getGroupId (int groupPosition)

获取给定位置的组的ID。 这个组ID必须在不同的组间唯一。 合并的ID（见getCombinedGroupId(long) ）在所有项目（组和所有子项）中必须是唯一的。

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 
View getGroupView (int groupPosition, 
                boolean isExpanded, 
                View convertView, 
                ViewGroup parent)

获取显示给定组的视图。 此视图仅适用于该组 - 组的子视图将使用getChildView(int, int, boolean, View, ViewGroup)获取该组的子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

hasStableIds

Added in API level 1 
boolean hasStableIds ()

指示在对基础数据进行更改时，子ID和组ID是否稳定。

Returns
boolean whether or not the same ID always refers to the same object

也可以看看：

isChildSelectable

Added in API level 1 
boolean isChildSelectable (int groupPosition, 
                int childPosition)

是否可以选择指定位置的孩子。

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 
boolean isEmpty ()

Returns
boolean

也可以看看：

onGroupCollapsed

Added in API level 1 
void onGroupCollapsed (int groupPosition)

当一个组被折叠时调用。

Parameters
groupPosition int: The group being collapsed.

onGroupExpanded

Added in API level 1 
void onGroupExpanded (int groupPosition)

当一个组被扩展时调用。

Parameters
groupPosition int: The group being expanded.

registerDataSetObserver

Added in API level 1 
void registerDataSetObserver (DataSetObserver observer)

Parameters
observer DataSetObserver

也可以看看：

unregisterDataSetObserver

Added in API level 1 
void unregisterDataSetObserver (DataSetObserver observer)

Parameters
observer DataSetObserver

也可以看看：

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