Extend from View or Its Subclasses

A view must be a subclass of View. To implement a view, you shall extend from View or its subclasses.

Here are a few existent subclasses that you might extend from:

• View: the most fundamental class.
• ScrollView: a view container that allows the user to scroll the content in a smaller viewport.
• Section: a view that also implements IDSpace. It is also a good example to see how a view implements IDSpace.
• TextView: a view for displaying text and Web content. You can use it if you'd like to display Web content in a part of your view.

In additions to extending from them (the is-a relation), you can use them as a member (the has-a relation). For more information, please refer to the Build with Composite of Views chapter.