frameworks\base\core\res\res\values\dimens.xml
<!-- Height of the status bar -->
mm <dimen name="status_bar_height">0dp</dimen>
<!-- Height of the bottom navigation / system bar. -->
mm <dimen name="navigation_bar_height">0dp</dimen>
<!-- Height of the bottom navigation bar in portrait; often the same as @dimen/navigation_bar_height -->
mm <dimen name="navigation_bar_height_landscape">0dp</dimen>
