Android studio, kotlin fails when trying to use immersive mode

user_1452537 0
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I'm trying to learn android studio, android, and kotlin. Mostly this has been straightforward but with a few glitches. One such glitch is the following for which I could use some help:

I'm trying to create a phone view in immersive mode. According to the documentation (https://developer.android.com/training/system-ui/immersive) the following function should do the trick.

private fun hideSystemBars() {
    val windowInsetsController =
        ViewCompat.getWindowInsetsController(window.decorView) ?: return
    // Configure the behavior of the hidden system bars
    windowInsetsController.systemBarsBehavior =
        WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    // Hide both the status bar and the navigation bar
    windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
}// end hideSystemBars function

I set this in the main Activity onCreate function as follows

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

       binding = ActivityMainBinding.inflate(layoutInflater)

        requestWindowFeature(Window.FEATURE_NO_TITLE)
        supportActionBar?.hide()

        setContentView(binding.root)
        hideSystemBars()

    }// end onCreate function

Unfortunately I seem to missing something basic as this always fails because ViewCompat.getWindowInsetsController(window.decorView) always returns null (I ran several tests to verify this)

I've verified that window.decorView is not null and looks okay. As a precaution I replaced the hideSystemBars() function call with window.decorView.doOnLayout {hideSystemBars()} in case the layout wasn't complete but this doesn't help. In fact, from some addition tests I ran use of the window.decorView.doOnLayout {} doesn't seem to work either no matter what function is used in the brackets (another glitch I don't understand)

I think I may be missing something basic (and possibly trivial) but cannot seem to discover how to make this work. Any help will be appreciated.

kotlin screen hide view android
1 Answers

Maybe you should check your API Level on the device. The following solution works for me.

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
            val windowInsetsController = ViewCompat.getWindowInsetsController(window.decorView) ?: return
            // Configure the behavior of the hidden system bars
            windowInsetsController.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
            // Hide both the status bar and the navigation bar
            windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
        }else{
            val flags =
                (View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)
            window!!.decorView.setSystemUiVisibility(flags)
        }
user_175789200
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