Android Hide Status Bar and Navigation Bar

HideSystemUI.kt

import android.os.Build
import android.os.Handler
import android.os.Looper
import android.view.View
import android.view.Window
import android.view.WindowInsets
import android.view.WindowInsetsController
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat

fun hideStatusBarAndNavigationBar(window: Window) {
    hideUI(window)
    hideAgain(window)
}

private fun hideUI(window: Window) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        window.setDecorFitsSystemWindows(false)
        val controller = window.insetsController
        if (controller != null) {
            controller.hide(WindowInsets.Type.statusBars() or WindowInsets.Type.navigationBars())
            controller.systemBarsBehavior =
                WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
        }
    } else {
        @Suppress("DEPRECATION")
        window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN or
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or
                View.SYSTEM_UI_FLAG_IMMERSIVE or
                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
    }
}

private fun hideAgain(window: Window) {
    ViewCompat.setOnApplyWindowInsetsListener(window.decorView) { _, insets ->
        val visible = insets.isVisible(WindowInsetsCompat.Type.systemBars())
        if (visible) {
            // 3초 뒤에 hideStatusBarAndNavigationBar(window) 호출
            Handler(Looper.getMainLooper()).postDelayed({
                hideUI(window)
            }, 3000)
        }
        insets
    }
}