Package icyllis.modernui.widget

Interface ExpandableListAdapter

All Known Implementing Classes:
BaseExpandableListAdapter
public interface ExpandableListAdapter
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.

  • Method Summary

    Modifier and Type
    Method
    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 Details

    • registerDataSetObserver

      void registerDataSetObserver(DataSetObserver observer)
      See Also:

    • unregisterDataSetObserver

      void unregisterDataSetObserver(DataSetObserver observer)
      See Also:

    • 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:

    • getGroupView

      View getGroupView(int groupPosition, boolean isExpanded, @Nullable View convertView, @NonNull 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, @Nullable View convertView, @NonNull 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.

    • areAllItemsEnabled

      boolean areAllItemsEnabled()
      See Also:

    • isEmpty

      boolean isEmpty()
      See Also:

    • 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.