如何真正獲得 Android 中的導航欄高度

Question

我擁有一台能夠隱藏導航欄的 HTC One A9。 在我的應用程序中，我需要獲取導航欄的高度並設置與之對應的填充。 這是我現在的問題：當我隱藏導航欄時，內邊距仍在設置中（即使 Snapchat 也有這個問題）。 我的問題是：是否有替代代碼使其工作？

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;
}

感謝您的幫助！

Answer 1

這是我用來獲取導航欄大小的代碼。 它的高度將在 Point.y

歸功於這個答案

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;
}

編輯：為了回答您的問題，我必須使用此功能，因為我想將 ResideMenu 添加到我的應用程序中，但由於導航欄的原因，我的應用程序底部最終出現了一個奇怪的空白邊距。

所以我編輯了這個由 ResideMenu 添加的函數，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;
}

希望這會幫助你。

Answer 2

使用以下代碼獲取導航欄。 但是，您需要考慮多窗口模式以及導航欄是在窗口的底部還是左側或右側。

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

這是最簡單的答案。 您只需要傳遞活動的rootView 。 如果未顯示條形，則高度將為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 }