Fullscreen Activity in Android ?

Put below code in onCreate() method

try {
    window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE            or 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)
} catch (e: Exception) {
    e.printStackTrace()
}