listSelector: This property is used to set the selector of the expandable list View. In above example of divider we also set the divider height 1dp between the list items. This could be in dp ( density pixel ), sp(scale independent pixel) or px ( pixel ). dividerHeight: This specify the height of the divider between group list items. divider: This is a drawable or color to draw between different group list items.īelow we draw red color divider between different group items. However, you can use wrap content if the ExpandableListView parent has a specific size, such as 200 pixels.Ģ. In other words we mean if the parent were ScrollView then you could not specify wrap_content since it can be of any length. Important Note: You cannot use the value wrap_content for the height attribute of a ExpandableListView in XML if the parent’s size is not strictly specified. Adapters are used to supply or control the data that will be displayed in an ExpandableListView. We can attach listeners events to the ExpandableListView to listen for OnClick or any other events on the Group or the individual children. Each group can be expanded or collapsed individually to show or hide its children items. Different from the listview by allowing two level groups which can individually be expanded to show its children. In Android, ExpandableListView is a View that shows items in a vertically scrolling two level list. – getChildView() – Returns view for list child item. – getGroupView() – Returns view for the list group item. This class extends BaseExpandableListAdapter and it provides required methods to render listview.
Now create a package named adapter and create a class named ExpandableListViewAdapter.java and add below code. Next create a layout file for list child i.e list_row_child.xml and add the below code in your layout file. Now create a layout file for list group i.e list_row_group.xml and add the below code in your layout file. 1st one for the listview group item and 2nd one is for the list view child item.ġ.
But for Expandable ListView, we need two XML layout files. To create a list view, we only need one XML layout file. Step 3) Create layout XML for expandable list. The code will create an expandable list view for the app. Now create a layout file for the MainActivity.java i.e activity_man.xml and add the below code in your layout file. Add the below string values to the string.xml located in res ⇒ values ⇒ strings.xml.
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