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Android features various JAVA package description

In the Android application development, usually using JAVA language, in addition to the familiar with the basics of JAVA language, they also need to understand Android provides extended functionality JAVA

JAVA applications in the general, if you need to use reference-based library, usually need to use the following method:

import javax.swing .*;

JAVA expressed above code references the GUI components Swing, javax.swing that JAVA in a package.

android provide some extended JAVA class library, class library is divided into several packages, each package contains a number of categories. For example: In the Android in the calculator is a relatively simple procedure, the entrance program file for the Calculator.java, the file 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 android .* packages written in a way, it is important description of the package is as follows:

android.app: to provide high-level process model, provide the basic runtime environment

android.content: contains various data on the device to access and release of class

android.database: browsing through the content provider and operational databases

android.graphics: the underlying graphics library, including canvas, color filters, points, rectangles, you can draw them directly on the screen.

android.location: location and related services in classes

android.media: to provide some class management of multiple audio and video media interface

android.net: network access to help the class, more than the usual java.net .* Interface

android.os: provides a system service, message transport, IPC mechanisms

android.provider: Provides classes to access Android content provider

android.telephony: to provide call-related API interaction

android.view: provide the basis for user interface Interface Framework

android.util: involved in instrumental methods, such as time and date of the operation

android.webkit: default browser operator interface

android.widget: includes a variety of UI elements (mostly visible) in the application use the screen

Article Source: http://os.51cto.com/art/200905/126049.htm

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One response to “Android features various JAVA package description”

  1. Meera says:

    Thanks for this useful info :)

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