Android-First Android Program

• Directory structure and function of Android project

Directory	Function
Gen	Automatically generated files, do not modify
Assets	Customization of the resources needed in the project, the Android platform does not recognize
Res	Engineering resources, the Android platform is recognized, and IDs are automatically generated in the Gen directory
Drawable	Drawing of resources (Pictures), corresponding to different resolutions
Layout	Layout Management Files
Values	Managing constant values
Androidmanifest.xml	A project manifest file that describes the entire Android application.

• Activity

Activity is the user interface for Android applications. A lot of controls can be placed in an activity.

Activity can also be understood as a container for controls.

• Important attributes

Android:layout_width width

Android:layout_height height

fill_parent | Wrap_content

Android:layout_weight weight (default = 0)

Android:id Unique identification used to reference in a program or configuration file

The width and height are the properties that the control must contain.

Android-First Android program