What is Android ?

Android is a software stack for mobile devices that includes an operating system, middleware and key applications. This early look at the Android SDK provides the tools and APIs necessary to begin developing applications on the Android platform using the Java programming language.

Android是一個包含作業系統、中介程式與應用程式的行動裝置軟體平台，初期的Android SDK提供必要的API(應用程式開發介面)與工具以使用Java語言開發在Android平台上開發應用軟體。

The picture shows The Tools(Eclipse) to develop Android project. Because there is no Android mobile now,so developers must use simulator of Android.

Google的Android手機軟體開發工具，上圖顯示在Eclipse程式工具計畫中所看到的編程情況，目前由於無實體的Android手機，因此開發人員必須透過模擬器來模擬操作。