Final answer:
A custom adapter that extends the BaseAdapter class can supply the data for UI elements in Android applications.
Step-by-step explanation:
A custom adapter that extends the BaseAdapter class can supply the data for the UI elements in Android applications.
For example, if you have a ListView in your application and you want to display a list of items, you can create a custom adapter to handle the data binding between the list and the underlying data source.
The custom adapter overrides methods such as getCount() to specify the number of items in the list, getItem() to retrieve a specific item, and getView() to create a view for each item in the list.