Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to analyze the various functions of the Android Java package. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Friends who are familiar with the Android operating system all know that the Java language is basically used to develop Android applications. Then if you want to apply this system flexibly, you should be familiar with the various functions of the Android Java package. In general JAVA applications, if you need to reference the basic class library, you usually need to use the following methods:

Import javax.swing.*

The above code represents a package in the GUI component Swing,javax.swing that references JAVA, which is JAVA.

Adroid provides some extended JAVA class libraries, which are divided into several packages, each containing several classes. For example, in Android, the calculator is a relatively simple program, and its entry program file is Calculator.java, which contains the following:

Package com.android.calculator2; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.util.Config; import android.view.Menu; import android.view.MenuItem; import android.view.Window; import android.view.View; import android.widget.Button; import android.widget.ListView; import android.content.res.Configuration

In Android, various packages are written as android.*. The descriptions of important packages are as follows:

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

Android.content: contains various classes for accessing and publishing data on the device

Android.database: browsing and manipulating databases through content providers

Android.graphics: underlying graphics library, including canvas, color filtering, dots, rectangles

You can draw them directly to the screen.

Android.location: classes for location and related services

Android.media: provides some media interfaces for managing a variety of audio and video

Android.net: classes that provide help with network access, beyond the usual java.net.* interface

Android.os: provides system services, message transmission, IPC mechanism

Android.opengl: a tool for providing OpenGL

Android.provider: a content provider that provides class access to Android

Android.telephony: provides API interaction related to making phone calls

Android.view: provides a basic user interface framework

Android.util: involves instrumental methods, such as time and date operations

Android.webkit: default browser operation interface

Android.widget: contains various UI elements (mostly visible)

Use in the screen of an application

The above is the editor for you to share how to analyze the various functions of the Android Java package, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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