Android Basics 01

Introduction to View and ViewGroup

1. View similar to Swring in JPanel. Represents a blank rectangular area in which most UI components inherit view or its subclasses.

2.View also has a more important subclass, ViewGroup, which is usually used as a container for other components.

3. Simply speaking, the view is the parent control of all controls, Viewgrouo can contain other view objects, and is the parent class of all layouts

4.Activity is the equivalent of an exhibition board, which has no visible content, and you can show it by pasting it onto the display panel. Setcontentview (this);

Android Basics 01