如何知道导航栏的高度是多少？
adb shell dumpsys window | findstr /C:"NavigationBar"
Window #6: WindowStateAnimator{a07bab2 NavigationBar0}
mNavigationBar=Window{be23eb1 u0 NavigationBar0}
mNavigationBarCanMove=false
mNavigationBarPosition=4
mBottomGestureHost=Window{be23eb1 u0 NavigationBar0}
mForceShowNavigationBarEnabled=false mAllowLockscreenWhenOn=false