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Android Reference

ExpandableListAdapter


android.widget

Interface ExpandableListAdapter

    • Method Summary

      Methods
      Modifier and Type Method and Description
      boolean areAllItemsEnabled()
      Object getChild(int groupPosition, int childPosition)
      Gets the data associated with the given child within the given group.
      long getChildId(int groupPosition, int childPosition)
      Gets the ID for the given child within the given group.
      int getChildrenCount(int groupPosition)
      Gets the number of children in a specified group.
      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.
      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.
      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.
      Object getGroup(int groupPosition)
      Gets the data associated with the given group.
      int getGroupCount()
      Gets the number of groups.
      long getGroupId(int groupPosition)
      Gets the ID for the group at the given position.
      View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
      Gets a View that displays the given group.
      boolean hasStableIds()
      Indicates whether the child and group IDs are stable across changes to the underlying data.
      boolean isChildSelectable(int groupPosition, int childPosition)
      Whether the child at the specified position is selectable.
      boolean isEmpty()
      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)
    • Method Detail

      • getGroupCount

        int getGroupCount()
        Gets the number of groups.
        Returns:
        the number of groups
      • getChildrenCount

        int getChildrenCount(int groupPosition)
        Gets the number of children in a specified group.
        Parameters:
        groupPosition - the position of the group for which the children count should be returned
        Returns:
        the children count in the specified group
      • getGroup

        Object getGroup(int groupPosition)
        Gets the data associated with the given group.
        Parameters:
        groupPosition - the position of the group
        Returns:
        the data child for the specified group
      • getChild

        Object getChild(int groupPosition,
                      int childPosition)
        Gets the data associated with the given child within the given group.
        Parameters:
        groupPosition - the position of the group that the child resides in
        childPosition - the position of the child with respect to other children in the group
        Returns:
        the data of the child
      • getGroupId

        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 - the position of the group for which the ID is wanted
        Returns:
        the ID associated with the group
      • getChildId

        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 - the position of the group that contains the child
        childPosition - the position of the child within the group for which the ID is wanted
        Returns:
        the ID associated with the child
      • hasStableIds

        boolean hasStableIds()
        Indicates whether the child and group IDs are stable across changes to the underlying data.
        Returns:
        whether or not the same ID always refers to the same object
        See Also:
        Adapter.hasStableIds()
      • getGroupView

        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 - the position of the group for which the View is returned
        isExpanded - whether the group is expanded or collapsed
        convertView - 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 - the parent that this view will eventually be attached to
        Returns:
        the View corresponding to the group at the specified position
      • getChildView

        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 - the position of the group that contains the child
        childPosition - the position of the child (for which the View is returned) within the group
        isLastChild - Whether the child is the last child within the group
        convertView - 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 - the parent that this view will eventually be attached to
        Returns:
        the View corresponding to the child at the specified position
      • isChildSelectable

        boolean isChildSelectable(int groupPosition,
                                int childPosition)
        Whether the child at the specified position is selectable.
        Parameters:
        groupPosition - the position of the group that contains the child
        childPosition - the position of the child within the group
        Returns:
        whether the child is selectable.
      • onGroupExpanded

        void onGroupExpanded(int groupPosition)
        Called when a group is expanded.
        Parameters:
        groupPosition - The group being expanded.
      • onGroupCollapsed

        void onGroupCollapsed(int groupPosition)
        Called when a group is collapsed.
        Parameters:
        groupPosition - The group being collapsed.
      • getCombinedChildId

        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 - 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

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


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