I have a base class that I am extending, but want to inflate a view where the normal Java constructor would be.
class TextView(context: Context?) : ViewAbstractClass(context)
I am not sure how to do this in Kotlin. What are the constructs are there Kotlin that allow you to do complex initialisation of objects?
https://kotlinlang.org/docs/reference/classes.html#constructors
class Customer(name: String) {
init {
logger.info("Customer initialized with value ${name}")
}
}
init code block relate to the standard constructors? Example ... can we set name after the init code block has run ... or can we call default constructors at the end of the init code block?
There are a couple ways this can be done, however this is what I've been doing in my app.
class TextView : ViewAbstractClass {
constructor(context: Context) : super(context)
constructor(context: Context, attributeSet: AttributeSet) : super(context, attributeSet)
constructor(context: Context, attributeSet: AttributeSet, defStyleAttr: Int) : super(context, attributeSet, defStyleAttr) {
// custom init code for this constructor.
}
constructor(context: Context, attributeSet: AttributeSet, defStyleAttr: Int, defStyleRes: Int) : super(context, attributeSet, defStyleAttr, defStyleRes)
init {
// Common init code
}
}
Notice that you don't actually use () in the class signature, but instead provide all the constructors explicitly.
You can learn more about secondary constructors here: https://kotlinlang.org/docs/reference/classes.html
super at different stages of initialisation? Like with the init mechanism ... can we call one of these other constructors at some stage during init? Or is init called after the default constructors have finished?
voddan stated above, you're looking for init. init is always called after the parent's init and you do not need to call super (actually, you can not).