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Android Reference

SimpleExpandableListAdapter


android.widget

Class SimpleExpandableListAdapter

  • All Implemented Interfaces:
    ExpandableListAdapter, HeterogeneousExpandableList


    public class SimpleExpandableListAdapter
    extends BaseExpandableListAdapter
    An easy adapter to map static data to group and child views defined in an XML file. You can separately specify the data backing the group as a List of Maps. Each entry in the ArrayList corresponds to one group in the expandable list. The Maps contain the data for each row. You also specify an XML file that defines the views used to display a group, and a mapping from keys in the Map to specific views. This process is similar for a child, except it is one-level deeper so the data backing is specified as a List>, where the first List corresponds to the group of the child, the second List corresponds to the position of the child within the group, and finally the Map holds the data for that particular child.
    • Constructor Detail

      • SimpleExpandableListAdapter

        public SimpleExpandableListAdapter(Context context,
                                   List<? extends Map<String,?>> groupData,
                                   int groupLayout,
                                   String[] groupFrom,
                                   int[] groupTo,
                                   List<? extends List<? extends Map<String,?>>> childData,
                                   int childLayout,
                                   String[] childFrom,
                                   int[] childTo)
        Constructor
        Parameters:
        context - The context where the ExpandableListView associated with this SimpleExpandableListAdapter is running
        groupData - A List of Maps. Each entry in the List corresponds to one group in the list. The Maps contain the data for each group, and should include all the entries specified in "groupFrom"
        groupFrom - A list of keys that will be fetched from the Map associated with each group.
        groupTo - The group views that should display column in the "groupFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the groupFrom parameter.
        groupLayout - resource identifier of a view layout that defines the views for a group. The layout file should include at least those named views defined in "groupTo"
        childData - A List of List of Maps. Each entry in the outer List corresponds to a group (index by group position), each entry in the inner List corresponds to a child within the group (index by child position), and the Map corresponds to the data for a child (index by values in the childFrom array). The Map contains the data for each child, and should include all the entries specified in "childFrom"
        childFrom - A list of keys that will be fetched from the Map associated with each child.
        childTo - The child views that should display column in the "childFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the childFrom parameter.
        childLayout - resource identifier of a view layout that defines the views for a child. The layout file should include at least those named views defined in "childTo"
      • SimpleExpandableListAdapter

        public SimpleExpandableListAdapter(Context context,
                                   List<? extends Map<String,?>> groupData,
                                   int expandedGroupLayout,
                                   int collapsedGroupLayout,
                                   String[] groupFrom,
                                   int[] groupTo,
                                   List<? extends List<? extends Map<String,?>>> childData,
                                   int childLayout,
                                   String[] childFrom,
                                   int[] childTo)
        Constructor
        Parameters:
        context - The context where the ExpandableListView associated with this SimpleExpandableListAdapter is running
        groupData - A List of Maps. Each entry in the List corresponds to one group in the list. The Maps contain the data for each group, and should include all the entries specified in "groupFrom"
        groupFrom - A list of keys that will be fetched from the Map associated with each group.
        groupTo - The group views that should display column in the "groupFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the groupFrom parameter.
        expandedGroupLayout - resource identifier of a view layout that defines the views for an expanded group. The layout file should include at least those named views defined in "groupTo"
        collapsedGroupLayout - resource identifier of a view layout that defines the views for a collapsed group. The layout file should include at least those named views defined in "groupTo"
        childData - A List of List of Maps. Each entry in the outer List corresponds to a group (index by group position), each entry in the inner List corresponds to a child within the group (index by child position), and the Map corresponds to the data for a child (index by values in the childFrom array). The Map contains the data for each child, and should include all the entries specified in "childFrom"
        childFrom - A list of keys that will be fetched from the Map associated with each child.
        childTo - The child views that should display column in the "childFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the childFrom parameter.
        childLayout - resource identifier of a view layout that defines the views for a child. The layout file should include at least those named views defined in "childTo"
      • SimpleExpandableListAdapter

        public SimpleExpandableListAdapter(Context context,
                                   List<? extends Map<String,?>> groupData,
                                   int expandedGroupLayout,
                                   int collapsedGroupLayout,
                                   String[] groupFrom,
                                   int[] groupTo,
                                   List<? extends List<? extends Map<String,?>>> childData,
                                   int childLayout,
                                   int lastChildLayout,
                                   String[] childFrom,
                                   int[] childTo)
        Constructor
        Parameters:
        context - The context where the ExpandableListView associated with this SimpleExpandableListAdapter is running
        groupData - A List of Maps. Each entry in the List corresponds to one group in the list. The Maps contain the data for each group, and should include all the entries specified in "groupFrom"
        groupFrom - A list of keys that will be fetched from the Map associated with each group.
        groupTo - The group views that should display column in the "groupFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the groupFrom parameter.
        expandedGroupLayout - resource identifier of a view layout that defines the views for an expanded group. The layout file should include at least those named views defined in "groupTo"
        collapsedGroupLayout - resource identifier of a view layout that defines the views for a collapsed group. The layout file should include at least those named views defined in "groupTo"
        childData - A List of List of Maps. Each entry in the outer List corresponds to a group (index by group position), each entry in the inner List corresponds to a child within the group (index by child position), and the Map corresponds to the data for a child (index by values in the childFrom array). The Map contains the data for each child, and should include all the entries specified in "childFrom"
        childFrom - A list of keys that will be fetched from the Map associated with each child.
        childTo - The child views that should display column in the "childFrom" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the childFrom parameter.
        childLayout - resource identifier of a view layout that defines the views for a child (unless it is the last child within a group, in which case the lastChildLayout is used). The layout file should include at least those named views defined in "childTo"
        lastChildLayout - resource identifier of a view layout that defines the views for the last child within each group. The layout file should include at least those named views defined in "childTo"
    • Method Detail

      • getChild

        public Object getChild(int groupPosition,
                      int childPosition)
        Description copied from interface: ExpandableListAdapter
        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
      • getChildId

        public long getChildId(int groupPosition,
                      int childPosition)
        Description copied from interface: ExpandableListAdapter
        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 ExpandableListAdapter.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
      • getChildView

        public View getChildView(int groupPosition,
                        int childPosition,
                        boolean isLastChild,
                        View convertView,
                        ViewGroup parent)
        Description copied from interface: ExpandableListAdapter
        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 ExpandableListAdapter.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
      • newChildView

        public View newChildView(boolean isLastChild,
                        ViewGroup parent)
        Instantiates a new View for a child.
        Parameters:
        isLastChild - Whether the child is the last child within its group.
        parent - The eventual parent of this new View.
        Returns:
        A new child View
      • getChildrenCount

        public int getChildrenCount(int groupPosition)
        Description copied from interface: ExpandableListAdapter
        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

        public Object getGroup(int groupPosition)
        Description copied from interface: ExpandableListAdapter
        Gets the data associated with the given group.
        Parameters:
        groupPosition - the position of the group
        Returns:
        the data child for the specified group
      • getGroupCount

        public int getGroupCount()
        Description copied from interface: ExpandableListAdapter
        Gets the number of groups.
        Returns:
        the number of groups
      • getGroupId

        public long getGroupId(int groupPosition)
        Description copied from interface: ExpandableListAdapter
        Gets the ID for the group at the given position. This group ID must be unique across groups. The combined ID (see ExpandableListAdapter.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
      • getGroupView

        public View getGroupView(int groupPosition,
                        boolean isExpanded,
                        View convertView,
                        ViewGroup parent)
        Description copied from interface: ExpandableListAdapter
        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 ExpandableListAdapter.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 ExpandableListAdapter.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
      • newGroupView

        public View newGroupView(boolean isExpanded,
                        ViewGroup parent)
        Instantiates a new View for a group.
        Parameters:
        isExpanded - Whether the group is currently expanded.
        parent - The eventual parent of this new View.
        Returns:
        A new group View
      • isChildSelectable

        public boolean isChildSelectable(int groupPosition,
                                int childPosition)
        Description copied from interface: ExpandableListAdapter
        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.
      • hasStableIds

        public boolean hasStableIds()
        Description copied from interface: ExpandableListAdapter
        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()


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