Delete a image in a ImaveView programmatically created using kotlin

Question

I need to display a different image according to a condition. The problem is that the previous image remains visible under the next image?

I have nowhere found using the correct command to delete the previous image before displaying the next one.

private fun showDecision(warning: String) {
        var imgResId = 0
        var resId = 0

        // accessing our custom image which we have in drawable folder
        when (warning) {
            "wrong" -> {
                imgResId = R.drawable.wrong
                resId = imgResId
            }
            "notGood" -> {
                imgResId = R.drawable.notGood
                resId = imgResId
            }
            "bad" -> {
                imgResId = R.drawable.bad
                resId = imgResId
            }
        }

        // image de l'arbitre
        val decisionView = ImageView(this)
        // setting height and width of imageview
        decisionView.layoutParams = RelativeLayout.LayoutParams(392, 700)
        decisionView.x = hut.x - 80 // setting margin from left
        decisionView.y = aDecision.y // setting margin from top

        // accessing our relative layout from activity_main.xml
        decisionLayout = findViewById<RelativeLayout>(R.id.decision_layout)
        decisionView.setImageResource(resId)

        // Add ImageView to linearLayout
        decisionLayout?.addView(decisionView) // adding image to the layout
        decisionLayout?.visibility = View.VISIBLE
        decisionShown = true
    }

setBackgroundResource(0) does nothing.

Before that, in my onClick(view: View?) I use GONE as below

   if (decisionShown) {
        decision_layout.visibility = View.GONE
        decisionShown = false
    }

What did I not do correctly? Thank you

Answer 1

You can clear imageview content by calling setImageDrawable(null);

imgView.setImageDrawable(null);

such usage is documented in the official docs: ImageView#setImageDrawable .

Answer 2

The right instruction is view.removeAllViews() for me and it works. Why "AllViews"? Just because it could be some views, not only the one preceded.