在沉浸模式下隐藏系统栏

有些内容在全屏模式下会让用户获得最佳体验，状态栏或导航栏上不显示任何指示器。例如视频、游戏、图片库、图书和演示文稿幻灯片。这称为沉浸式模式。本页介绍了如何采用全屏模式吸引用户更深入地了解相关内容。

图 1. 沉浸模式示例。

沉浸式模式可帮助用户避免在游戏过程中意外退出，并提供沉浸式体验，让用户畅享图片、视频和图书。不过，请注意用户来回切换应用查看通知、进行临时搜索或执行其他操作的频率。由于沉浸模式会导致用户无法轻松访问系统导航栏，因此请仅在对用户体验的好处超出使用额外屏幕空间之外时使用沉浸模式。

使用 WindowInsetsControllerCompat.hide() 隐藏系统栏，使用 WindowInsetsControllerCompat.show() 调出系统栏。

以下代码段展示了配置按钮以隐藏和显示系统栏的示例。

Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
    ...

    val windowInsetsController =
        WindowCompat.getInsetsController(window, window.decorView)
    // Configure the behavior of the hidden system bars.
    windowInsetsController.systemBarsBehavior =
        WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE

    // Add a listener to update the behavior of the toggle fullscreen button when
    // the system bars are hidden or revealed.
    ViewCompat.setOnApplyWindowInsetsListener(window.decorView) { view, windowInsets ->
        // You can hide the caption bar even when the other system bars are visible.
        // To account for this, explicitly check the visibility of navigationBars()
        // and statusBars() rather than checking the visibility of systemBars().
        if (windowInsets.isVisible(WindowInsetsCompat.Type.navigationBars())
            || windowInsets.isVisible(WindowInsetsCompat.Type.statusBars())) {
            binding.toggleFullscreenButton.setOnClickListener {
                // Hide both the status bar and the navigation bar.
                windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
            }
        } else {
            binding.toggleFullscreenButton.setOnClickListener {
                // Show both the status bar and the navigation bar.
                windowInsetsController.show(WindowInsetsCompat.Type.systemBars())
            }
        }
        ViewCompat.onApplyWindowInsets(view, windowInsets)
    }
}

Java

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...

    WindowInsetsControllerCompat windowInsetsController =
            WindowCompat.getInsetsController(getWindow(), getWindow().getDecorView());
    // Configure the behavior of the hidden system bars.
    windowInsetsController.setSystemBarsBehavior(
            WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    );

    // Add a listener to update the behavior of the toggle fullscreen button when
    // the system bars are hidden or revealed.
    ViewCompat.setOnApplyWindowInsetsListener(
        getWindow().getDecorView(),
        (view, windowInsets) -> {
        // You can hide the caption bar even when the other system bars are visible.
        // To account for this, explicitly check the visibility of navigationBars()
        // and statusBars() rather than checking the visibility of systemBars().
        if (windowInsets.isVisible(WindowInsetsCompat.Type.navigationBars())
                || windowInsets.isVisible(WindowInsetsCompat.Type.statusBars())) {
            binding.toggleFullscreenButton.setOnClickListener(v -> {
                // Hide both the status bar and the navigation bar.
                windowInsetsController.hide(WindowInsetsCompat.Type.systemBars());
            });
        } else {
            binding.toggleFullscreenButton.setOnClickListener(v -> {
                // Show both the status bar and the navigation bar.
                windowInsetsController.show(WindowInsetsCompat.Type.systemBars());
            });
        }
        return ViewCompat.onApplyWindowInsets(view, windowInsets);
    });
}

您可以选择指定要隐藏的系统栏的类型，并确定用户与系统栏互动时的行为。

指定要隐藏哪些系统栏

如需指定要隐藏的系统栏的类型，请将以下参数之一传递给 WindowInsetsControllerCompat.hide()。

指定隐藏的系统栏的行为

使用 WindowInsetsControllerCompat.setSystemBarsBehavior() 指定隐藏的系统栏在用户与其互动时的行为方式。