The navigation drawer is a panel that displays the app’s main navigation options on the left edge of the screen. It is hidden most of the time, but is revealed when the user swipes a finger from the left edge of the screen or, while at the top level of the app, the user touches the app icon in the action bar. //导航抽屉是一个显示在屏幕左边的应用的主要的用于导航的选项面板。它大多数时间是隐藏的,但是当用户从屏幕左边清扫或者点击了action bar上的应用图标时,导航抽屉将会出现 This lesson describes how to implement a navigation drawer using the DrawerLayout APIs available in the Support Library . Navigation Drawer Design Before you decide to use a navigation drawer in your