Android is an operating system that runs on an open Linux kernel. The upper application of Android adopts the programming language of Java, and the underlying core library of it using C/C++language. Therefore, it's very convenient for developers to call various API by Android SDK to realize all kinds of functions. Besides, Android supports cross-platform and cross-language operation as well, so you can easily call any program written in other languages by JNI technology to meet a variety of developing needs.%Android是一款运行在开放的Linux内核之上的操作系统，其上层应用程序采用Java开发语言，底层核心类库采用C/C++语言编写，开发者能够非常便捷的使用Android SDK调用丰富的API，实现各种功能。不仅如此，Android还支持跨平台跨语言操作，通过JNI技术可以方便的调用使用其他语言编写的程序，满足各种不同的开发需求。
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