隱藏導覽列
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
本課程將說明如何隱藏導覽列,
Android 4.0 (API 級別 14)。
雖然本課程的重點
導覽列,那麼您必須設計讓應用程式隱藏狀態列
請參閱「隱藏狀態列」一文。
隱藏導覽列和狀態列 (但保留方便存取)
可讓內容使用整個顯示空間,進而提供更身歷其境的
使用者體驗
圖 1. 導覽列。
隱藏導覽列
您可以使用
SYSTEM_UI_FLAG_HIDE_NAVIGATION
標記。這段程式碼同時隱藏了
導覽列和狀態列:
Kotlin
window.decorView.apply {
// Hide both the navigation bar and the status bar.
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
// a general rule, you should design your app to hide the status bar whenever you
// hide the navigation bar.
systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_FULLSCREEN
}
Java
View decorView = getWindow().getDecorView();
// Hide both the navigation bar and the status bar.
// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
// a general rule, you should design your app to hide the status bar whenever you
// hide the navigation bar.
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
注意事項:
讓內容顯示在導覽列後方
在 Android 4.1 以上版本中,您可以將應用程式內容設為
這樣內容就不會在導覽列隱藏時調整大小
電視節目方法是使用
SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
。
您可能還需要使用
SYSTEM_UI_FLAG_LAYOUT_STABLE
,協助您的應用程式維持
穩定的版面配置。
使用這個方法時,您有責任確保
應用程式的使用者介面中,最後不會被系統資訊列遮住。如要
如果想瞭解這個主題,請參閱
隱藏狀態列課程。
這個頁面中的內容和程式碼範例均受《內容授權》中的授權所規範。Java 與 OpenJDK 是 Oracle 和/或其關係企業的商標或註冊商標。
上次更新時間:2025-07-27 (世界標準時間)。
[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["缺少我需要的資訊","missingTheInformationINeed","thumb-down"],["過於複雜/步驟過多","tooComplicatedTooManySteps","thumb-down"],["過時","outOfDate","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["示例/程式碼問題","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-07-27 (世界標準時間)。"],[],[],null,["# Hide the navigation bar\n\nThis lesson describes how to hide the navigation bar, which was introduced in\nAndroid 4.0 (API level 14).\n\nEven though this lesson focuses on hiding the\nnavigation bar, you should design your app to hide the status bar\nat the same time, as described in [Hiding the Status Bar](/training/system-ui/status).\nHiding the navigation and status bars (while still keeping them readily accessible)\nlets the content use the entire display space, thereby providing a more immersive\nuser experience.\n\n**Figure 1.** Navigation bar.\n\nHide the Navigation Bar\n-----------------------\n\nYou can hide the navigation bar using the\n[SYSTEM_UI_FLAG_HIDE_NAVIGATION](/reference/android/view/View#SYSTEM_UI_FLAG_HIDE_NAVIGATION) flag. This snippet hides both\nthe navigation bar and the status bar: \n\n### Kotlin\n\n```kotlin\nwindow.decorView.apply {\n // Hide both the navigation bar and the status bar.\n // SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as\n // a general rule, you should design your app to hide the status bar whenever you\n // hide the navigation bar.\n systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_FULLSCREEN\n}\n```\n\n### Java\n\n```java\nView decorView = getWindow().getDecorView();\n// Hide both the navigation bar and the status bar.\n// SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as\n// a general rule, you should design your app to hide the status bar whenever you\n// hide the navigation bar.\nint uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION\n | View.SYSTEM_UI_FLAG_FULLSCREEN;\ndecorView.setSystemUiVisibility(uiOptions);\n```\n\nNote the following:\n\n- With this approach, touching anywhere on the screen causes the navigation bar (and status bar) to reappear and remain visible. The user interaction causes the flags to be be cleared.\n- Once the flags have been cleared, your app needs to reset them if you want to hide the bars again. See [Responding to UI Visibility Changes](/training/system-ui/visibility) for a discussion of how to listen for UI visibility changes so that your app can respond accordingly.\n- Where you set the UI flags makes a difference. If you hide the system bars in your activity's [onCreate()](/reference/android/app/Activity#onCreate(android.os.Bundle)) method and the user presses Home, the system bars will reappear. When the user reopens the activity, [onCreate()](/reference/android/app/Activity#onCreate(android.os.Bundle)) won't get called, so the system bars will remain visible. If you want system UI changes to persist as the user navigates in and out of your activity, set UI flags in [onResume()](/reference/android/app/Activity#onResume()) or [onWindowFocusChanged()](/reference/android/view/Window.Callback#onWindowFocusChanged(boolean)).\n- The method [setSystemUiVisibility()](/reference/android/view/View#setSystemUiVisibility(int)) only has an effect if the view you call it from is visible.\n- Navigating away from the view causes flags set with [setSystemUiVisibility()](/reference/android/view/View#setSystemUiVisibility(int)) to be cleared.\n\nMake Content Appear Behind the Navigation Bar\n---------------------------------------------\n\nOn Android 4.1 and higher, you can set your application's content to appear behind\nthe navigation bar, so that the content doesn't resize as the navigation bar hides and\nshows. To do this, use\n[SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION](/reference/android/view/View#SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION).\nYou may also need to use\n[SYSTEM_UI_FLAG_LAYOUT_STABLE](/reference/android/view/View#SYSTEM_UI_FLAG_LAYOUT_STABLE) to help your app maintain a\nstable layout.\n\nWhen you use this approach, it becomes your responsibility to ensure that critical parts\nof your app's UI don't end up getting covered by system bars. For more\ndiscussion of this topic, see the [Hiding the Status Bar](/training/system-ui/status#behind) lesson."]]