android.view.View.systemUiVisibility deprecated. What is the replacement?

For compatibility, use WindowCompat and WindowInsetsControllerCompat. You’ll need to upgrade your gradle dependency for androidx.core to at least 1.6.0-alpha03 so that there will be support for setSystemBarsBehavior on SDK < 30.

private fun hideSystemUI() {
    WindowCompat.setDecorFitsSystemWindows(window, false)
    WindowInsetsControllerCompat(window, mainContainer).let { controller ->
        controller.hide(WindowInsetsCompat.Type.systemBars())
        controller.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    }
}

private fun showSystemUI() {
    WindowCompat.setDecorFitsSystemWindows(window, true)
    WindowInsetsControllerCompat(window, mainContainer).show(WindowInsetsCompat.Type.systemBars())
}

You can find out more information about WindowInsets by watching this YouTube video

For devices with notches at the top of the display, you can add the following to your v27 theme.xml file make the UI appear either side of the notch:

<item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>

You can read more at this link: Display Cutout

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