如何真正获得 Android 中的导航栏高度

Question

我拥有一台能够隐藏导航栏的 HTC One A9。 在我的应用程序中，我需要获取导航栏的高度并设置与之对应的填充。 这是我现在的问题：当我隐藏导航栏时，内边距仍在设置中（即使 Snapchat 也有这个问题）。 我的问题是：是否有替代代码使其工作？

public static int getNavBarHeight(Context context) {
    int result = 0;
    int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0) {
        result = context.getResources().getDimensionPixelSize(resourceId);
    }
    return result;
}

感谢您的帮助！

Answer 1

这是我用来获取导航栏大小的代码。 它的高度将在 Point.y

归功于这个答案

public static Point getNavigationBarSize(Context context) {
    Point appUsableSize = getAppUsableScreenSize(context);
    Point realScreenSize = getRealScreenSize(context);

    // navigation bar on the right
    if (appUsableSize.x < realScreenSize.x) {
        return new Point(realScreenSize.x - appUsableSize.x, appUsableSize.y);
    }

    // navigation bar at the bottom
    if (appUsableSize.y < realScreenSize.y) {
        return new Point(appUsableSize.x, realScreenSize.y - appUsableSize.y);
    }

    // navigation bar is not present
    return new Point();
}

public static Point getAppUsableScreenSize(Context context) {
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = windowManager.getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);
    return size;
}

public static Point getRealScreenSize(Context context) {
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Display display = windowManager.getDefaultDisplay();
    Point size = new Point();

    if (Build.VERSION.SDK_INT >= 17) {
        display.getRealSize(size);
    } else if (Build.VERSION.SDK_INT >= 14) {
        try {
            size.x = (Integer)     Display.class.getMethod("getRawWidth").invoke(display);
            size.y = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
    } catch (IllegalAccessException e) {} catch     (InvocationTargetException e) {} catch (NoSuchMethodException e) {}
    }

    return size;
}

编辑：为了回答您的问题，我必须使用此功能，因为我想将 ResideMenu 添加到我的应用程序中，但由于导航栏的原因，我的应用程序底部最终出现了一个奇怪的空白边距。

所以我编辑了这个由 ResideMenu 添加的函数，如下所示：

@Override
protected boolean fitSystemWindows(Rect insets) {
    // Applies the content insets to the view's padding, consuming that content (modifying the insets to be 0),
    // and returning true. This behavior is off by default and can be enabled through setFitsSystemWindows(boolean)
    // in API14+ devices.

    int bottomPadding = insets.bottom;

    Point p = getNavigationBarSize(getContext());

    if (Build.VERSION.SDK_INT >= 21 && p.x != 0) {
        Resources resources = getContext().getResources();
        int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
        if (resourceId > 0) {
            bottomPadding += resources.getDimensionPixelSize(resourceId);
        }
    }

    this.setPadding(viewActivity.getPaddingLeft() + insets.left, viewActivity.getPaddingTop() + insets.top,
            viewActivity.getPaddingRight() + insets.right, viewActivity.getPaddingBottom() + bottomPadding);
    insets.left = insets.top = insets.right = insets.bottom = 0;
    return true;
}

希望这会帮助你。

Answer 2

使用以下代码获取导航栏。 但是，您需要考虑多窗口模式以及导航栏是在窗口的底部还是左侧或右侧。

getNavigationBarHeight(){
    Resources resources = context.getResources();
    int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
    if (resourceId > 0) {
        return resources.getDimensionPixelSize(resourceId);
    }
    return 0;
}

Answer 3

这是最简单的答案。 您只需要传递活动的rootView 。 如果未显示条形，则高度将为0 。

View rootView;
ViewCompat.setOnApplyWindowInsetsListener(rootView, (v, insets) -> {
    final int statusBarHeight = insets.getInsets(WindowInsetsCompat.Type.statusBars()).top; // in px
    final int navigationBarHeight = insets.getInsets(WindowInsetsCompat.Type.navigationBars()).bottom; // in px

    // do something with the heights

    return WindowInsetsCompat.CONSUMED;
});

Answer 4

    fun Context.isSoftNavigationBarAvailable(): Boolean {
        val navBarInteractionModeId = resources.getIdentifier(
                  "config_navBarInteractionMode",
                  "integer",
                  "android"
        )
        if (navBarInteractionModeId > 0 && resources.getInteger(navBarInteractionModeId) > 0) {
            // nav gesture is enabled in the settings
            return false
        }
        val appUsableScreenSize = Point()
        val realScreenSize = Point()
        val defaultDisplay = (getSystemService(Context.WINDOW_SERVICE) as WindowManager).defaultDisplay
        defaultDisplay.getSize(appUsableScreenSize)
        defaultDisplay.getRealSize(realScreenSize)
        return appUsableScreenSize.y < realScreenSize.y }