hello, I've an issue with parameters visibility an...

# announcements

[roberto]

hello, I've an issue with parameters visibility and constructors. I google the problem but I wasn't able to find any solution, so given the following code:

class MyAwesomeView: FrameLayout {
	constructor(context: Context?, attrs: AttributeSet? = null) : super(context, attrs)
	constructor(context: Context?, attrs: AttributeSet?, parm1: Int) : super(context, attrs, parm1)
	constructor(context: Context?, attrs: AttributeSet?, parm1: Int, parm2: Int) : super(context, attrs, parm1, parm2)
	
	init {
		context.someMethod(attrs)
	}
}

The init method cannot access attrs, I'm getting "Unresolved reference 'attrs'". Why is that? how can I make init access attrs. Shouldn't be enough by adding attrs to constructors as it is here?

[Nate]

So far as I know, init is called after the constructor, not as the constructor body. Try making attrs a val

[dawidhyzy]

init is called after primary constructor

[dawidhyzy]

secondary constructors are called after init

[dawidhyzy]

https://kotlinlang.org/docs/reference/classes.html#constructors

[Nate]

TIL. That’s pretty confusing though

[dawidhyzy]

Yeah, this is why secondary constructors were not available in Kotlin for long time

[roberto]

Read your comment and documentation and I'm still not sure how to solve the problem 🙂.

Would you call context.someMethod(attrs) on secondary constructors body then?

That works, but I'm not quite sure if it's the best

[streetsofboston]

Create a private method private fun init(...) and just call it from the body of all your secondary constructors.

[ghedeon]

class MyAwesomeView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0)
    : FrameLayout(context, attrs, defStyleAttr) {

    init {
        attrs...
    }