Android 基础(二)、SDK中重要的pacakages（包）

android SDK中重要的java packages

1. java.lang:
   core Java language classes
2. java.io:
   input/output capabilities
3. java.net:
   network connections
4. java.util:
   utility classes. This package includes the Log class used to write to the LogCat.
5. java.text:
   text handling utilities
6. java.math:
   math and number manipulation classes
7. javax.net:
   network classes
8. javax.security:
   security related classes
9. javax.xml:
   DOM based XML classes
10. org.apache.*:
    http related classes
11. org.xml:
    SAX based XML classes

android specific packages

packages	解释
android.app	Android application model access
android.content	accessing and publishing data in Android
android.net	contains the Uri class, used for accessing various content
android.graphics	graphics primitives
android.opengl	OpenGL classes
android.os	system level access to the Android environment
android.provider	Content Provider related classes
android.telepehony	Telephony capability access
android.text	Text layout
android.util	collection of utilities for text manipulation, including XML
android.view	User interface elements
android.webkit	Browser functionality
android.widget	more user interface elements

some packages绝对依赖于安卓应用环境

android.app
android.view
android.content

optional packages

GPS
Bluetooth
IrDA(红外数据组织)
WiFi