CODEWITHSUNDEEP
androidkotlinviewconstructorandroid-custom-view
Sazzad Hissain Khan
Sazzad Hissain Khan

Reputation: 40255

Overriding multiple versions of constructor in Kotlin

I was trying to implement CustomView in Kotlin, which is to be used both for programatically and for statically. Thus, I need to override both versions of constructors.

For programatically I use version,

class CustomView @JvmOverloads constructor(
   context: Context, 
) : View(context)

For statically I use version,

class CustomView @JvmOverloads constructor(
  context: Context, 
  attrs: AttributeSet? = null,
) : View(context, attrs)

How can I change it for overriding multiple versions under same class which then I can instantiate from static views as well as programatically?

There are some post on constructors i.e. Kotlin secondary constructor which does not help for overriding multiple versions of constructor.

Upvotes: 1

Views: 1331

Answers (2)

Santanu Sur
Santanu Sur

Reputation: 11487

This should work both programatically and statically :- 

class CustomView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : View(context, attrs, defStyleAttr)

Programatically just call :-

CustomView(context) // passing other params to constructor is not mandatory..

Upvotes: 1

Purfakt
Purfakt

Reputation: 111

I created this code to recreate your issue:

Test.java:

public class Test {

    private int i ;
    private String name;

    public Test(int i) {
        this.i = i;
        name = "test";
    }

    public Test(int i, String name) {
        this.i = i;
        this.name = name;
    }
}

TestK.kt:

class TestK : Test {
    constructor(i: Int, name: String): super(i, name)
    constructor(i: Int) : super(i)
}

As you can see, I'm overloading the parents constructor with different parameter amounts.

Upvotes: 1

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