在沉浸模式下隐藏系统栏

有些内容最好在全屏模式下观看,状态栏或导航栏上不会显示任何指示符。例如视频、游戏、图库、图书和演示文稿幻灯片。这称为沉浸模式。本页介绍了如何利用全屏模式吸引用户更深入地互动。

图 1. 沉浸模式示例。

沉浸模式可帮助用户避免在游戏过程中意外退出,并提供沉浸式的图片、视频和图书体验。但是,请留意用户进入和退出应用以查看通知、执行随机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,因此,只有当对用户的好处远不止使用额外的屏幕空间时,才使用沉浸模式。

使用 WindowInsetsControllerCompat.hide() 隐藏系统栏,使用 WindowInsetsControllerCompat.show() 将其重新显示。

以下代码段举例说明了如何将按钮配置为隐藏和显示系统栏。

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.
    window.decorView.setOnApplyWindowInsetsListener { 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())
            }
        }
        view.onApplyWindowInsets(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.
    getWindow().getDecorView().setOnApplyWindowInsetsListener((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 view.onApplyWindowInsets(windowInsets);
    });
}

(可选)您可以指定要隐藏的系统栏类型,并确定在用户与之交互时这些系统栏的行为。

指定要隐藏的系统栏

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

指定隐藏系统栏的行为

您可以使用 WindowInsetsControllerCompat.setSystemBarsBehavior() 指定隐藏的系统栏在用户与隐藏式系统栏互动时的行为方式。