[null,null,["最后更新时间 (UTC)：2025-08-29。"],[],[],null,["Most Android apps consist of regions referred to as the [system bars](/design/ui/mobile/guides/foundations/system-bars),\nthe navigation area, and the body.\n**Figure 4:** Parts of an Android app: systems bars (1), navigation area (2), and body (3)\n\nSystem bars\n\nThe status bar and navigation bar--collectively known as the system bars--display\nimportant information such as battery level, the time, and notification alerts,\nand provide direct device interaction from anywhere. Read more about [system\nbars](/design/ui/mobile/guides/foundations/system-bars).\n**Figure 5:** System bars (1)\n\nNavigation region\n\nNavigation represents the different affordances that allow a user to\nnavigate within your app, access important actions, or across the Android\nplatform.\n\nBody region \nThe body region holds the screen content. Body content is composed of additional\ngroupings and layout parameters. It must continue under navigation and system\nbar regions.\n\nDeclare \\[\\`WindowCompat.setDecorFitsSystemWindows(window, false)\\`\\]\\[5\\] for\nedge-to-edge insets.\n\nTo determine the appropriate composition and navigation patterns for your\nlayout, seek to understand how users interact with your content, and how they\nnavigate your app's information architecture. This understanding can guide your\ndesign toward being more user-focused by creating UI that users can act on."]]
