![]() ![]() For customization of list we need to implement ExpandableListAdapter in our custom adapter.īelow is the example code of ExpandableListAdapter in which we create CustomAdapter class and then implements ExpandableListAdapter in that class.I am using this tutorial for creating a custom listview from the database īut i modified the mainactivity such that the names and the image id's are retrieved from the database The implementation of this interface will provide the data for the children and also initiate the views for the children and groups. ![]() Now we explain these three adapters in detail:ĮxpandableListAdapter is an Adapter that links a ExpandableListView with the underlying data. In Android for supplying data in an ExpandableListView following adapters are used. It holds the data and send the data to Adapter view then view can takes the data from the adapter view and shows the data on different views like as ExpandableListView or other Views. The implementation of this interface will provide access to the data of the children (categorized by groups), and also instantiate views for the children and groups. Īdapter Used In ExpandableListView In Android:Īn adapter is a bridge between UI component and data source that helps us to fill data in UI component. Padding: set the padding from the all side’s of the expandable list view.īelow we set the 50dp padding from all the side’s of the expandable list view.paddingBottom: set the padding from the bottom side of the expandable list view. ![]() paddingTop: set the padding from the top side of the expandable list view.paddingLeft: set the padding from the left side of the Progress bar.paddingRight: set the padding from the right side of the expandable list view.padding: padding attribute is used to set the padding from left, right, top or bottom. The reason we have used this example image because we need fill data using Adapter to show you childDivider attribute in action.Ħ. In this we have set green color as Child divider and red color as divider. The below image is from the ExpandableListView example which is explained at the end of this post. childDivider:This is a drawable or color to draw between different child list items of a expandable list view.īelow we draw green color divider between different child items of a group. It is generally orange or Sky blue color mostly but you can also define your own custom color or an image as a list selector as per your design.īelow selector color is green, when you select any list item then that item’s background color is green. 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. ExpandableListView With Example In Android Studio
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