最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
Android is an open source, Linux-based mobile device operating system, mainly used in mobile devices, such as smartphones and tablets. Android was developed by the Open Mobile Alliance, led by Google and other companies.
This tutorial will teach you basic Android programming and learn some advanced concepts related to Android application development. This tutorial is for beginners to help them understand basic Android programming. After completing this tutorial, you will have a medium level of expertise in Android development, from which you can move on to the next stage of study. Android programming is based on the Java programming language, so if you understand Java programming, it will help you better learn Android application development. 3.1.1. Who is suitable for this tutorial? ¶
3.1.2. What you need to know before reading this tutorial ¶