How to set different ids' for dynamic buttons programmatically? (Kotlin)

Question

I have a button (add) that creates new buttons when pressed (up to 8). But when I try to refer to these buttons and add functionality, I am unable to find the ids' for them. How could I make and find ids' for these buttons?

Note: the button ids should be created automatically when (add) is pressed.

val LLayout: View = layout
    var currentId = 0


    add.setOnClickListener {
        val addedButton = Button(this)
        addedButton.text = written.text.toString()
        addedButton.id = currentId++
        addedButton.layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)
        (LLayout as LinearLayout).addView(addedButton)
        //clearing text from EditText written
        written.text.clear()
    }

already asked https://stackoverflow.com/a/3217786/9181430 – Rohit Kumar Jun 16 '21 at 03:46 — Rohit Kumar, Jun 16 '21 at 03:46

score 2 · Answer 1 · answered Jun 16 '21 at 03:25

2

Instead of a unique id you can simply set tag property for each Button object and then find that button with that tag and define your functionality

answered Jun 16 '21 at 03:25

Masoud Badrmiran

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score 1 · Accepted Answer · answered Jun 16 '21 at 03:58

1

You can generate an Id for each button using generateViewId() method.

 addedButton.id = generateViewId()

Also, Create a new Button every time the user clicks on add button. So you should do something like this:

add.setOnClickListener {
        val addedButton = Button(this)
        addedButton.text = written.text.toString()
        addedButton.id = generateViewId()
        addedButton.layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT)
        (LLayout as LinearLayout).addView(addedButton)
        //clearing text from EditText written
        written.text.clear()
    }

answered Jun 16 '21 at 03:58

Alpha 1

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How can I reference the generated id later on. For example, if I want to make the button lead to a new activity, change color, Etc. – Shagufta Jun 16 '21 at 13:26
You can save the generated id or button in an array or list and can reference it later. – Alpha 1 Jun 16 '21 at 15:39
1

Could you show how to do this in your answer please? – Shagufta Jun 16 '21 at 16:03

score 0 · Answer 3 · answered Jun 16 '21 at 03:47

0

For unique id you can set the (number of child view + 1) as id to the newly created Button.

answered Jun 16 '21 at 03:47

Krishnendu Nag

1

How to set different ids' for dynamic buttons programmatically? (Kotlin)

3 Answers3