Android. app: provides high-level program models and basic runtime Environments
Android. Content: contains various classes for accessing and publishing device data.
Android. Database: browses and operates databases through content providers
Android. Graphics: The underlying graphics library, including canvas, Color Filtering, vertices, and rectangles, which can be directly drawn to the screen.
Android. Location: class for locating and Related Services
Android. Media: Provides media interfaces for managing multiple types of audio and video.
Android.net: class that provides network access assistance, exceeding the normal java.net. * interface
Android. OS: Provides system services, message transmission, and IPC Mechanisms.
Android. OpenGL: Provides OpenGL tools.
Android. provider: provides a class to access Android content providers.
Android. Telephony: provides API Interaction Related to dialing.
Android. View: provides a basic user interface framework.
Android. util: a tool-based method, such as time and date operations.
Android. WebKit: default browser operation interface
Android. Widget: contains various UI elements (mostly visible) used on the application Screen