How to reference view objects inside a list?-CodePudding

I'm trying to create a method to set a listener to each of my views inside a list like:

    private fun setListeners() {

    val clickableViews: List<View> =
        listOf(box_one_text, box_two_text, box_three_text,
    box_four_text, box_five_text)

    for(item in clickableViews){
        item.setOnClickListener{makeColored(it)}
    }
}

box_one_text, box_two_text and so on are the id of the views inside my xml file and I'm trying to set a color of it when they are clicked like:

   fun makeColored(view: View) {
    when (view.id) {

        // Boxes using Color class colors for background
        R.id.box_one_text -> view.setBackgroundColor(Color.DKGRAY)
        R.id.box_two_text -> view.setBackgroundColor(Color.GRAY)

        // Boxes using Android color resources for background
        R.id.box_three_text -> view.setBackgroundResource(android.R.color.holo_green_light)
        R.id.box_four_text -> view.setBackgroundResource(android.R.color.holo_green_dark)
        R.id.box_five_text -> view.setBackgroundResource(android.R.color.holo_green_light)

        else -> view.setBackgroundColor(Color.LTGRAY)
    }
}

the problems is that all of the elements inside the list are all red lines or can't reference by the list

CodePudding user response：

First thing first, the list type is wrong. You said that box_one_text and box_two_text are the view id. View id type is Int, so you should change the list to list of Int

val clickableViews: List<Int> =
    listOf(box_one_text, box_two_text, box_three_text,
box_four_text, box_five_text)

Then, to apply a click listener to each of the id, you need to find the view using findViewById

for(item in clickableViews){
    findViewById<View>(item).setOnClickListener{makeColored(it)}
}

Or if you use view binding, you can follow below code:

val clickableViews: List<View> =
    listOf(binding.boxOneText, binding.boxTwoText, binding.boxThreeText,
binding.boxFourText, binding.boxFiveText)
for(item in clickableViews){
    item.setOnClickListener{makeColored(it)}
}

CodePudding user response：

Try this:

private fun setListeners() {

    val clickableViews: List<Int> =
        listOf(R.id.box_one_text, R.id.box_two_text, R.id.box_three_text,
    R.id.box_four_text, R.id.box_five_text)
    
    for(item in clickableViews){
        findViewById<View>(item).setOnClickListener{makeColored(it)}
    }

}