Android Learning Record-Activity

What is 1,activity?

Activity is a window of a user interface where various UI components, such as text, input boxes, and buttons, are placed in a user interaction.

2, why do I need activity? (meaning, function, etc)

In one application, there is one or more interfaces that interact with the user, and in Android, the interface called Activity,activity is responsible for the UI part, which is the container and carrier of various UI components that can control and manage the UI components in which the layout is

The life cycle of 3,activity

Android Learning Record-Activity