You can find the rules for how you can call super ctors here: kotlinlang.org/docs/reference/classes.html#inheritance . In short, if the ... ... <看更多>

class Foo: MySuper { // initialization of superclass is not allowed constructor(a: Int) : super(a + 1) { ... } // must call super() here }. ... <看更多>

033 Pass data to super constructor in Kotlin · 10 Python Tips and Tricks For Writing Better Code · 0277 Make ... ... <看更多>

Let me give you the equivalent code in Kotlin. class CustomView : View { constructor(context: Context) : super(context) { viewTreeObserver ... <看更多>

Allowing subclasses to run code before the superclass constructor would make ... your implementation may cause the super class to "break". ... <看更多>