Problem With ForEach

Android
1

While adding a TextView and two ImageView s to root ConstraintLayout and setting constraints programmatically, something weird happens while I am setting Tag s of the views.

Here is how I create aforementioned views and add them to view:

val confirmLocationText = TextView(context!!)
confirmLocationText.text = "Confirm?"
confirmLocationText.textSize = 20f
confirmLocationText.typeface = Typeface.DEFAULT_BOLD
confirmLocationText.measure(0, 0)

val confirmLocationTickImage = ImageView(context!!)
confirmLocationTickImage.setImageResource(R.drawable.tick)
confirmLocationTickImage.scaleType = ImageView.ScaleType.CENTER_CROP

val confirmLocationCancelImage = ImageView(context!!)
confirmLocationCancelImage.setImageResource(R.drawable.cancel)
confirmLocationCancelImage.scaleType = ImageView.ScaleType.CENTER_CROP

arrayOf(confirmLocationCancelImage, confirmLocationTickImage,confirmLocationText).forEach {
    it.id = View.generateViewId()
    it.tag = confirmInterfaceTag
    it.alpha = 0f
    viewToBeCreated?.eventMapFragmentRootConstraintLayout?.addView(it)
    it.animate().alpha(1f).duration = confirmInterfaceFadeInFadeOutAnimation // Fade-In animation for Confirm Interface
}

And after this piece of code, I set constraints programmatically by using ConstraintSet .

The problem occurs in the forEach . It only runs twice but all three of views are added anyway (Although one of the ImageView s don’t have assigned tag but animation works). When I remove confirmLocationCancelImage (or confirmLocationTickImage ) from arrayOf , it again runs twice but this time the removed ImageView won’t be added.

When I change the code as below, it works but I still don’t understand why it doesn’t work as it above…

    val confirmLocationText = TextView(context!!)
    confirmLocationText.text = "Confirm?"
    confirmLocationText.textSize = 20f
    confirmLocationText.typeface = Typeface.DEFAULT_BOLD
    confirmLocationText.measure(0, 0)

    val confirmLocationTickImage = ImageView(context!!)
    confirmLocationTickImage.apply {
        setImageResource(R.drawable.tick)
        id = View.generateViewId()
        tag = confirmInterfaceTag
        alpha = 0f
        viewToBeCreated?.eventMapFragmentRootConstraintLayout?.addView(this)
        animate().alpha(1f).duration = confirmInterfaceFadeInFadeOutAnimation
        scaleType = ImageView.ScaleType.CENTER_CROP
    }

    val confirmLocationCancelImage = ImageView(context!!)
    confirmLocationCancelImage.setImageResource(R.drawable.cancel)
    confirmLocationCancelImage.scaleType = ImageView.ScaleType.CENTER_CROP

    arrayOf(confirmLocationCancelImage,confirmLocationText).forEach {
        it.id = View.generateViewId()
        it.tag = confirmInterfaceTag
        it.alpha = 0f
        viewToBeCreated?.eventMapFragmentRootConstraintLayout?.addView(it)
        it.animate().alpha(1f).duration = confirmInterfaceFadeInFadeOutAnimation // Fade-In animation for Confirm Interface
    }

So I don’t understand:

  1. Why forEach runs twice?

  2. When it runs twice, why three of the views are added?

  3. And when it runs twice and three of the views are added then why one of them misses tag?

I hope it is not a silly question but seemed weird and annoying to me. Thanks for the help in advance!