Eclipse 开发 Android，第一个 HelloWord 程序(学习1)
名词解释：
SDK:Software Development Kit
AVD:Android Virtual Devices
ADT:Android Development Tools
1. Installing Android SDK
下载windows android sdk链接：http://androidappdocs.appspot.com/sdk/download.html?v=android-sdk_r3-windows.zip
详细说明地址：http://androidappdocs.appspot.com/sdk/index.html
备注：我下载到 D:\Android\
2. Installing the ADT Plugin
[*]Eclipse ->Help > Software Updates.... In the dialog that appears, click the Available Software tab.
[*]Click Add Site... url https://dl-ssl.google.com/android/eclipse
[*]设置 Windows->Preferences->Android-> SDK Location set path "D:\Android\android-sdk_r3-windows\android-sdk-windows"
[*]Window->Android SDK and Android Manager ->Installed Packages 选择 Update All 按钮，下载使用SDK包，否则无法运行工程。
[*]Creating an AVD：Eclipse->Window->Android SDK and Android Manager ->Virtual Devices 选择New按钮，创建一个AVD, 注意SD Card 至少8M以上。
详细说明地址：http://androidappdocs.appspot.com/sdk/eclipse-adt.html#installing
3. Creating an Android Project
Eclipse create project
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