Android navigation bar size in xml

After looking in android source it looks like there is dimens for navigation bar height :

@android:dimen/navigation_bar_height

There are other dimens linked to nav bar, examples from android values/dimens.xml :

<!-- Height of the bottom navigation / system bar. -->
<dimen name="navigation_bar_height">48dp</dimen>
<!-- Height of the bottom navigation bar in portrait; often the same as @dimen/navigation_bar_height -->
<dimen name="navigation_bar_height_landscape">48dp</dimen>
<!-- Width of the navigation bar when it is placed vertically on the screen -->
<dimen name="navigation_bar_width">42dp</dimen>

Try this code:

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