kotlin android click again to exit
private var backPressedTime:Long = 0
lateinit var backToast:Toast
override fun onBackPressed() {
backToast = Toast.makeText(this, "Press back again to leave the app.", Toast.LENGTH_LONG)
if (backPressedTime + 2000 > System.currentTimeMillis()) {
backToast.cancel()
super.onBackPressed()
return
} else {
backToast.show()
}
backPressedTime = System.currentTimeMillis()
}