Android Learning 2-Learn to use Android Help documentation

Introduction:

Whether learning Vc,java or other languages, in addition to being familiar with the development environment, you need to be skilled in getting the knowledge we need from the official Help documentation. When downloading in SDK Manager, be sure to select the Help document to download to your local

After the download is complete, we open the Help document in the local folder D:\android-sdk\docs\reference\index.html

Help documents are categorized by function. Let me look at the services provided by Android, and also facilitate our use of the index

Android.app: Provides a high-level program model and provides a basic operating environment

Android.content contains a variety of classes for accessing and publishing data on devices

Android.database: Browsing and manipulating databases through content providers

Android.graphics: The underlying graphics library, which contains the canvas, color filters, dots, rectangles, can draw them directly onto the screen.

Android.location: Classes for targeting and related services

Android.media: Provides some classes to manage multiple audio and video media interfaces

Android.net: A class that provides help for network access, more than the usual java.net.* interface

Android.os: Provides system services, message transmission, IPC mechanisms

ANDROID.OPENGL: Tools for OpenGL, 3D acceleration

Android.provider: Provides class access to Android content providers

Android.telephony: Providing API interaction with call-related calls

Android.view: Provides a basic interface framework for the user interface

Android.util: Methods involving tools, such as the operation of a time-date

Android.webkit: Default Browser operator interface

Android.widget: Contains various UI elements (mostly visible) used in the application's screen