BottomSheetDialogFragment not painting nav bar android

I'm using the BottomSheetDialogFragment and I'm overriding this to add my theme :

override fun getTheme() = R.style.BottomSheetDialogTheme

Where this style looks like :

<style name="BottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog">
  <item name="bottomSheetStyle">@style/btmsheetStyle</item>
  <item name="android:navigationBarColor">@color/white</item>
</style>

<style name="btmsheetStyle" parent="Widget.Design.BottomSheet.Modal">
  <item name="android:backbround">@drawable/rounded_dialog</item>
</style>

My idea is to have the BottomSheetDialogFragment as the right image but is showing as the left one

I ended up doing a hack to make it work but the problem is that I'm using a deprecated method and perhaps in Android R it crashes, so I would like to make it better.

This is how I ended up doing the white nav bar android

@RequiresApi(api = Build.VERSION_CODES.M)
private fun setWhiteNavigationBar(dialog: Dialog) {
   val window = dialog.window
   window?.let {
      val displayMetrics = DisplayMetrics()
      it.windowManager.defaultDisplay.getMetrics(displayMetrics) <-- deprecated
      val navigationBarDrawable = GradientDrawable()
      navigationBarDrawable.shape = GradientDrawable.RECTANGLE
      navigationBarDrawable.setColor(Color.WHITE)
      val layers = arrayOf(navigationBarDrawable)
      val windowBackground = LayerDrawable(layer)
      windowBackground.setLayerInsetTop(1, displayMetrics.heightPixels)
      it.setBackgroundDrawable(windowBackground)
   }
}

override fun onCreateDialog(savedInstanceState: Bunde?): Dialog {
   val dialog = super.onCreateDialog(savedInstanceState)
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) {
      setWhiteNavigationBar(dialog)
   }
   return dialog
}

It does work, but I don't like the deprecated stuff, is there any way to make it better? With style, and avoid having overriding creating dialogs etc?

To avoid deprecation you can use this method and the rest leave like you were doing:

@RequiresApi(api = Build.VERSION_CODES.M)
private fun setWhiteNavigationBar(dialog: Dialog) {
        val window = dialog.window
        window?.let {
            val displayMetrics = getDisplayMetrics(it)
            val dimDrawable = GradientDrawable()
            val navigationBarDrawable = GradientDrawable()
            navigationBarDrawable.shape = GradientDrawable.RECTANGLE
            navigationBarDrawable.setColor(Color.WHITE)
            val layers = arrayOf(dimDrawable, navigationBarDrawable)
            val windowBackground = LayerDrawable(layers)
            windowBackground.setLayerInsetTop(1, displayMetrics.heightPixels)
            it.setBackgroundDrawable(windowBackground)
        }
    }

private fun getDisplayMetrics(window: Window): DisplayMetrics {
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
            val defaultDisplay =
                DisplayManagerCompat.getInstance(requireContext())
                    .getDisplay(Display.DEFAULT_DISPLAY)
            val displayContext = requireContext().createDisplayContext(defaultDisplay!!)
            displayContext.resources.displayMetrics
        } else {
            val displayMetrics = DisplayMetrics()
            @Suppress("DEPRECATION")
            window.windowManager.defaultDisplay.getMetrics(displayMetrics)
            displayMetrics
        }
    }

More info in Display Manager Compat