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【标题】:“西北农林科技大学·移动软件开发·实验5”是针对移动设备应用程序开发的一次实践教学,重点聚焦在Android平台上的秒表应用的构建。这个实验旨在让学生掌握如何在Android环境中创建实用且功能完整的应用程序,特别是涉及到动态UI更新和服务绑定的核心技术。 【描述】: 1. **秒表功能实现**:在Android平台上,开发一个秒表应用首先需要理解计时器的工作原理。这通常涉及到使用`System.currentTimeMillis()`方法获取当前时间,并在特定间隔内对比计算以实现计时。为了实现启停功能,可以利用`Handler`和`Runnable`接口。当用户点击开始按钮时,创建一个`Runnable`实例并将其提交给`Handler`,在`run()`方法中更新计时并重新调度自身以在下一周期执行。停止功能则需要移除`Runnable`,停止计时更新。 2. **服务绑定**:在Android中,服务是后台运行的组件,常用于执行长时间运行的任务。在这个实验中,秒表功能可能被封装在一个服务中,以确保即使用户离开应用程序,计时也能继续。服务可以通过`bindService()`方法进行绑定,允许客户端(这里是用户界面)与服务进行交互。服务端需要实现`Binder`接口,以便客户端可以通过`IBinder`接口调用服务的方法。这样,用户界面可以通过绑定的服务启动和停止秒表,同时通过`Handler`在主线程中更新UI,避免跨线程操作UI导致的异常。 【标签】:“android android studio”指出了本次实验使用的开发环境和平台。**Android Studio**是Google官方推出的Android应用程序集成开发环境,它提供了丰富的工具集,包括代码编辑器、调试器、模拟器等,方便开发者进行Android应用的开发、测试和调试。在这个实验中,学生将使用Android Studio来编写和运行秒表应用。 【文件名称列表】:虽然具体的源代码文件没有列出,但根据实验5的命名,我们可以推测压缩包中可能包含以下几个关键文件: 1. `StopwatchActivity.java`: 秒表应用的主活动类,负责UI显示和用户交互。 2. `StopwatchService.java`: 实现秒表功能的服务类,处理计时逻辑和与客户端的通信。 3. `MainActivity.xml`: 定义秒表应用的布局文件,包括开始/停止按钮和显示时间的文本视图。 4. `AndroidManifest.xml`: 应用程序配置文件,声明服务和活动。 5. 可能还有一些资源文件如图片、颜色或字符串资源。 通过这个实验,学生不仅能深入理解Android应用程序开发的基本流程,还能掌握服务、多线程和UI更新等高级概念,为未来更复杂的移动应用开发打下坚实基础。
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