Issue

This Content is from Stack Overflow. Question asked by Coca Cola35

I’m trying to make my view move in a loop around 4 corners. I did it by having a keyList. Originally my view is constrained to top and left border.

After each click, I update the keylist by removing first index of keyList and move it to the last.

I have this code currently. The view moves fine for the first 3 corners but the app crashed after.

        var keyList = arrayListOf(1,2,3,0)

        val puckMinX = border.minX().toFloat()
        val puckMaxX = (border.maxX() - puck.width).toFloat()
        val puckMinY= border.minY().toFloat()
        val puckMaxY = (border.maxY() - puck.height).toFloat()

        fun clickTextView(view: ImageView) {
            if (keyList[0] == 0) {
                puck.x = puckMinX
                puck.y = puckMinX
                var holder =keyList[0]
                println(keyList)
                println(keyList.remove(holder))
                println(keyList+holder)}
            else if (keyList[0] == 1) {
                puck.x = puckMaxX
                puck.y = puckMinY
                var holder =keyList[0]
                println(keyList)
                println(keyList.remove(holder))
                println(keyList+holder)}
            else if (keyList[0] == 2) {
                puck.x = puckMaxX
                puck.y = puckMaxY
                var holder =keyList[0]
                println(keyList)
                println(keyList.remove(holder))
                println(keyList+holder)}
            else if (keyList[0] == 3) {
                puck.x = puckMinX
                puck.y = puckMaxY
                var holder =keyList[0]
                println(keyList)
                println(keyList.remove(holder))
                println(keyList+holder)}
        }

        //applying lambda to each textview
        puck.setOnClickListener { clickTextView(puck) }

Could someone tell me what I did wrong? Or also is there a better way to make my view move in a loop? Any help is appreciated!

Solution

You can use add which adds element to end of the list

keyList.add(holder)

Edit

Note that you wont be able to print like println(keyList.add(holder)) because add will return true since it will successfully update the list. So you will have to do

keyList.add(holder)
println(keyList)

This Question was asked in StackOverflow by Coca Cola35 and Answered by Vojin Purić It is licensed under the terms of CC BY-SA 2.5. - CC BY-SA 3.0. - CC BY-SA 4.0.