切换全屏模式

Question

我需要一些帮助来切换全屏模式。我在首选项屏幕中有一个设置可以全屏显示。在我的主要活动的 onResume 中，我有：

if(mFullscreen == true) {
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

            } else
            {
                getWindow().addFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
                getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

            }

但这似乎不起作用，因为它需要在setContentView 之前调用，对吧？

...但是，我在setContentView 之前有requestWindowFeature(Window.FEATURE_NO_TITLE);，它带走了标题和状态栏...有人可以提供帮助吗？

---编辑--- 好的，我有一个错误导致它无法正常工作。所以它确实如此。现在，我只需要知道如何切换标题栏。

Answer 1

private void setFullscreen(boolean fullscreen)
{
    WindowManager.LayoutParams attrs = getWindow().getAttributes();
    if (fullscreen)
    {
        attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
    }
    else
    {
        attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
    }
    getWindow().setAttributes(attrs);
}

Answer 2

/**
 * toggles fullscreen mode
 * <br/>
 * REQUIRE: android:configChanges="orientation|screenSize"
 * <pre>
 * sample:
 *     private boolean fullscreen;
 *     ................
 *     Activity activity = (Activity)context;
 *     toggleFullscreen(activity, !fullscreen);
 *     fullscreen = !fullscreen;
 * </pre>
 */
private void toggleFullscreen(Activity activity, boolean fullscreen) {
    if (Build.VERSION.SDK_INT >= 11) {
        // The UI options currently enabled are represented by a bitfield.
        // getSystemUiVisibility() gives us that bitfield.
        int uiOptions = activity.getWindow().getDecorView().getSystemUiVisibility();
        int newUiOptions = uiOptions;
        boolean isImmersiveModeEnabled =
                ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
        if (isImmersiveModeEnabled) {
            Log.i(context.getPackageName(), "Turning immersive mode mode off. ");
        } else {
            Log.i(context.getPackageName(), "Turning immersive mode mode on.");
        }

        // Navigation bar hiding:  Backwards compatible to ICS.
        if (Build.VERSION.SDK_INT >= 14) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }

        // Status bar hiding: Backwards compatible to Jellybean
        if (Build.VERSION.SDK_INT >= 16) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
        }

        // Immersive mode: Backward compatible to KitKat.
        // Note that this flag doesn't do anything by itself, it only augments the behavior
        // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
        // all three flags are being toggled together.
        // Note that there are two immersive mode UI flags, one of which is referred to as "sticky".
        // Sticky immersive mode differs in that it makes the navigation and status bars
        // semi-transparent, and the UI flag does not get cleared when the user interacts with
        // the screen.
        if (Build.VERSION.SDK_INT >= 18) {
            newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        }
        activity.getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
    } else {
        // for android pre 11
        WindowManager.LayoutParams attrs = activity.getWindow().getAttributes();
        if (fullscreen) {
            attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
        } else {
            attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
        }
        activity.getWindow().setAttributes(attrs);
    }

    try {
        // hide actionbar
        if (activity instanceof ActionBarActivity) {
            if (fullscreen) ((ActionBarActivity) activity).getSupportActionBar().hide();
            else ((ActionBarActivity) activity).getSupportActionBar().show();
        } else if (Build.VERSION.SDK_INT >= 11) {
            if (fullscreen) activity.getActionBar().hide();
            else activity.getActionBar().show();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    // set landscape
   // if(fullscreen)  activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
   // else activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
}

我的代码在 android 2.3 和 4.4.2 上运行良好

Answer 3

自 Jellybean (4.1) 以来，有一种不依赖于 WindowManager 的新方法。而是在 Window 之外使用 setSystemUiVisibility，与使用 WindowManager 标志相比，这可以让您对系统栏进行更精细的控制。这是启用全屏的方式：

if (Build.VERSION.SDK_INT < 16) { //ye olde method
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);
} else { // Jellybean and up, new hotness
    View decorView = getWindow().getDecorView();
    // Hide the status bar.
    int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
    decorView.setSystemUiVisibility(uiOptions);
    // Remember that you should never show the action bar if the
    // status bar is hidden, so hide that too if necessary.
    ActionBar actionBar = getActionBar();
    actionBar.hide();
}

这就是您恢复上述代码的方式：

if (Build.VERSION.SDK_INT < 16) { //ye olde method
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
} else { // Jellybean and up, new hotness
    View decorView = getWindow().getDecorView();
    // Hide the status bar.
    int uiOptions = View.SYSTEM_UI_FLAG_VISIBLE;
    decorView.setSystemUiVisibility(uiOptions);
    // Remember that you should never show the action bar if the
    // status bar is hidden, so hide that too if necessary.
    ActionBar actionBar = getActionBar();
    actionBar.show();
}

Answer 4

有一个更短的切换全屏方法实现：

private void toggleFullscreen() {
    WindowManager.LayoutParams attrs = getWindow().getAttributes();
    attrs.flags ^= WindowManager.LayoutParams.FLAG_FULLSCREEN;
    getWindow().setAttributes(attrs);
}

它使用按位异或逻辑来切换FLAG_FULLSCREEN。

Answer 5

我的解决方案结合了以下方面的答案：

• cprcrack 对此问题的回答
• Holoeverywhere : how to programmatically remove at runtime the action bar from an activity
• Android: Programmatically detect if device has hardware menu button

我将这些方法添加到我的活动中。要切换全屏，请使用setFullScreen(!isFullScreen())。

public boolean isFullScreen() {

    return (getWindow().getAttributes().flags & 
        WindowManager.LayoutParams.FLAG_FULLSCREEN) != 0;
}

@SuppressLint("NewApi")
public void setFullScreen(boolean full) {

    if (full == isFullScreen()) {
        return;
    }

    Window window = getWindow();
    if (full) {
        window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    } else {
        window.clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

    if (Build.VERSION.SDK_INT >= 11) {
        if (full) {
            getActionBar().hide();
        } else {
            getActionBar().show();
        }
    }
}

就我而言，我想要一个菜单​​按钮来进行切换。问题：在没有硬件菜单按钮的设备上，隐藏操作栏也会隐藏从全屏返回的切换。所以，我添加了一些额外的逻辑，所以它只在设备有硬件菜单按钮时隐藏操作栏。请注意，运行 SDK 11-13 的设备没有。

    if (Build.VERSION.SDK_INT >= 14 
        && ViewConfiguration.get(this).hasPermanentMenuKey()))) {

        if (full) {
            getActionBar().hide();
        } else {
            getActionBar().show();
        }
    }

较旧的设备（运行 Gingerbread 或更早版本）具有标题栏而不是操作栏。以下代码将隐藏它，但请注意，一旦活动开始，标题栏将无法显示/隐藏。我在帮助菜单中向用户添加了一条消息，指出在旧设备重新启动应用程序/活动之前，对全屏的更改可能不会在旧设备上完全生效（这当然假设您坚持他们的选择并仅在他们需要时才执行此代码全屏）。

    // call before setContentView()
    if (Build.VERSION.SDK_INT < 11) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
    }

Answer 6

全屏的 Kotlin 解决方案。

if (isFullscreen) {
    WindowInsetsControllerCompat(activity?.window!!, root).apply {
        hide(WindowInsetsCompat.Type.systemBars())
        systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    }
} else {
    WindowInsetsControllerCompat(activity?.window!!, root)
        .show(WindowInsetsCompat.Type.systemBars())
}