Lambda with parameter in Kotlin

Question

I want to write TextWatcher for several EditTexts. In any of them I want to assign EditText value to a variable. Like this:

var variable: String? = null

private inner class CodeTextWatcher : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        variable = s?.toString()
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
    }
}

For several EditTexts I want to write something like:

private inner class CodeTextWatcher(private val method: (String?) -> Unit) : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        method(s?.toString())
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
    }
}

and call it:

textWatcher1 = CodeTextWatcher {variable1 = s}
textWatcher2 = CodeTextWatcher {variable2 = s}

But I cannot write s here and want to access s from afterTextChanged(s: Editable?). Is it possible?

EpicPandaForce · Accepted Answer · 2019-10-02 16:40:56Z

3

Have you tried:

textWatcher1 = CodeTextWatcher { s -> variable1 = s }
textWatcher2 = CodeTextWatcher { s -> variable2 = s }

Or in this case, maybe even

textWatcher1 = CodeTextWatcher { variable1 = it }
textWatcher2 = CodeTextWatcher { variable2 = it }

?

answered Oct 2, 2019 at 16:40

EpicPandaForce

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