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HeterogeneousExpandableList.java API Doc Android 5.1 API 5154 Thu Mar 12 22:22:10 GMT 2015 android.widget

HeterogeneousExpandableList

public interface HeterogeneousExpandableList

Additional methods that when implemented make an {@link ExpandableListAdapter} take advantage of the {@link Adapter} view type mechanism.

An {@link ExpandableListAdapter} declares it has one view type for its group items and one view type for its child items. Although adapted for most {@link ExpandableListView}s, these values should be tuned for heterogeneous {@link ExpandableListView}s.

Lists that contain different types of group and/or child item views, should use an adapter that implements this interface. This way, the recycled views that will be provided to {@link android.widget.ExpandableListAdapter#getGroupView(int, boolean, View, ViewGroup)} and {@link android.widget.ExpandableListAdapter#getChildView(int, int, boolean, View, ViewGroup)} will be of the appropriate group or child type, resulting in a more efficient reuse of the previously created views.

Fields Summary
Constructors Summary
Methods Summary
public int getChildType(int groupPosition, int childPosition)
Get the type of child View that will be created by {@link android.widget.ExpandableListAdapter#getChildView(int, int, boolean, View, ViewGroup)} for the specified child item.
param
groupPosition the position of the group that the child resides in
param
childPosition the position of the child with respect to other children in the group
return
An integer representing the type of child View. Two child views should share the same type if one can be converted to the other in {@link android.widget.ExpandableListAdapter#getChildView(int, int, boolean, View, ViewGroup)} Note: Integers must be in the range 0 to {@link #getChildTypeCount} - 1. {@link android.widget.Adapter#IGNORE_ITEM_VIEW_TYPE} can also be returned.
see
android.widget.Adapter#IGNORE_ITEM_VIEW_TYPE
see
#getChildTypeCount()
public int getChildTypeCount()
Returns the number of types of child Views that will be created by {@link android.widget.ExpandableListAdapter#getChildView(int, int, boolean, View, ViewGroup)} . Each type represents a set of views that can be converted in {@link android.widget.ExpandableListAdapter#getChildView(int, int, boolean, View, ViewGroup)} , for any group. If the adapter always returns the same type of View for all child items, this method should return 1.
This method will only be called when the adapter is set on the {@link AdapterView}.
return
The total number of types of child Views that will be created by this adapter.
see
#getGroupTypeCount()
see
#getChildType(int, int)
public int getGroupType(int groupPosition)
Get the type of group View that will be created by {@link android.widget.ExpandableListAdapter#getGroupView(int, boolean, View, ViewGroup)} . for the specified group item.
param
groupPosition the position of the group for which the type should be returned.
return
An integer representing the type of group View. Two group views should share the same type if one can be converted to the other in {@link android.widget.ExpandableListAdapter#getGroupView(int, boolean, View, ViewGroup)} . Note: Integers must be in the range 0 to {@link #getGroupTypeCount} - 1. {@link android.widget.Adapter#IGNORE_ITEM_VIEW_TYPE} can also be returned.
see
android.widget.Adapter#IGNORE_ITEM_VIEW_TYPE
see
#getGroupTypeCount()
public int getGroupTypeCount()
Returns the number of types of group Views that will be created by {@link android.widget.ExpandableListAdapter#getGroupView(int, boolean, View, ViewGroup)} . Each type represents a set of views that can be converted in {@link android.widget.ExpandableListAdapter#getGroupView(int, boolean, View, ViewGroup)} . If the adapter always returns the same type of View for all group items, this method should return 1.
This method will only be called when the adapter is set on the {@link AdapterView}.
return
The number of types of group Views that will be created by this adapter.
see
#getChildTypeCount()
see
#getGroupType(int)