(The android platform is a special software stack for mobile devices, including an operating system, middleware and many important uses Developers can build many applications through the Android SDK platform. The user program is written in Java program language and works on Dalvik. Dalvik is a virtual machine running on the Linux kernel for embedded use. Now Android SDK 1.0 is officially launched It includes the source code framework, instance projects, development tools, simulators, and of course, the comprehensive library files you need to use to develop Android.)