UI Overview//用户界面概述
Android's system UI provides the framework on top of which you build your app. Important aspects include the Home screen experience, global device navigation, and notifications.
//安卓的系统界面提供了你建立自己应用的上面的框架。重要的方面包括主屏幕的体验,总体设备的导航和通知。
Your app will play an important part in keeping the overall Android experience consistent and enjoyable to use. At the end of this chapter we introduce the main elements for achieving this goal in your app.
//你的应用在保持整个安卓体验的一致性和使用的愉悦性方面扮演着重要的角色。