Role of the viewgroup class

 

View class

1. The Android. View class is the most basic UI class. Many UI components on Android inherit this class.

2. These UI components include buttons, textview, and checkbox.

3. How should these UI components be placed?

Viewgroup class

1. The preceding UI component is placed in a special view container, which is the viewgroup.

2. viewgroup is used to layout the view components added to it.

3. Unfortunately, the android. View. viewgoup class is an abstract class and cannot be used directly.

Viewgroup class implementation

There are many classes for viewgoup implementation, which have their own layout characteristics. For example, the linearlayout class is to arrange its elements in the horizontal and vertical directions.