基于安卓的移动课堂应用开发毕业论文.doc

本科毕业设计（论文） 基于安卓的移动课堂应用开发 学 院 信息工程学院 专 业 通信工程 年级班别 2012级（）班 学 号 学生姓名 指导教师 原玲 2016 年5月 基于安卓的移动课堂应用开发 基于安卓的移动课堂应用开发 姚瑶瑶 信息工程学院 摘 要 随着计算机技术的飞速发展，一方面，各种各样的类库、框架层出不穷；另一方面，用户对于软件质量和功能的要求也越来越高。编程工作并不像有些人声称的那样，门槛变得越来越低，相反，由于系统变得越来越复杂，对编程人员来说，要求反而变高了。既然系统复杂度的增加不可避免，作为一个开发者，我们所能做的，便是寻求某些方法，以应对这复杂的系统、和步步紧逼的交付日期。 作为软件工程师们的经验结晶——设计模式，便是我们应对软件复杂度的有力武器。即便需求总是在改变，但恰如其分的软件设计，将赋予软件足够的弹性，去应用合理的变化。而作为设计模式一个核心的原则——模块化，则有助于我们分解复杂度。复杂的系统，经过足够的合理的抽象、封装，形成一个个正交的子系统，使得开发人员能够在同一时间只集中注意于某一个局部，而不是同时处理庞大的细节。 本文根据软件工程的一系列原则对安卓平台的移动课堂应用进行设计，并对Android应用中常用的几种设计模式进行比较，说明各个模式的优劣以及设计我们的方案时所作的权衡。 关键词：设计模式，软件复杂度，模块化 Abstract As the fast-developing of computer science, all kinds of software framework, libraries were born to ease our develop life. But at the other hand, our users want our software to provide more and more functionalities and expect that it’s stable. The life of development is not become much easy as somebody claimed that it’s easier and easier since there are so many tools that we can use. But thanks to the complexity of the system, our developer’s skill becomes very demanding. Since the complexity is unavoidable, we highly need a tool to hack with the large system and comfort our clients of the incoming delivery time. Design pattern, as the crystallization of the experience of our developers, is an extremely powerful arm for us to fight with the complexity of the system. Although the requirement is always changing, a well-designed architecture will give our software the ability to cope with some reasonable requirement change. Modularity, as the core principle of design pattern, can help us to decompose the complexity. Using some reasonable and sufficient abstraction and encapsulation, the large system can be decomposed to several orthogonal sub-systems, and our developers can now dive into some part but dont care others. In this paper, I shows that t