Implementing Java interface in Kotlin

Question

I have a Java interface:

public interface NonHindiQuery {
    void onNonHindiQueryReceived(String Query);
}

I want to implement it on Kotlin class:

class MainActivity : AppCompatActivity() {...}

Q: How can I do it?

add , NonHindiQurary after AppCompatActivity() before class body — Shayan Pourvatan
– Shayan Pourvatan, Commented Jun 28, 2017 at 10:55
now i getting this error kotlin.NotImplementedError: An operation is not implemented: not implemented — Hamza
– Hamza, Commented Jun 28, 2017 at 11:00
you must implement interface methods in your class, you've get this error because MainActivity must implement void onNonHindiQuraryRecived(String Queary); or set your class as abstract. but you need first way — Shayan Pourvatan
– Shayan Pourvatan, Commented Jun 28, 2017 at 11:01
this is how i did it class MainActivity : AppCompatActivity(),NonHindiQurary — Hamza
– Hamza, Commented Jun 28, 2017 at 11:13

marc_s · Accepted Answer · 2017-07-11 10:59:24Z

28

It's simple:

class MainActivity : AppCompatActivity(), NonHindiQuery {
    override fun onNonHindiQueryReceived(q: String) {
        // <...>
    }
}

To get rid of kotlin.NotImplementedError remove TODO("not implemented") from the method body:

@kotlin.internal.InlineOnly
public inline fun TODO(reason: String): Nothing = 
    throw NotImplementedError("An operation is not implemented: $reason")

edited Jul 11, 2017 at 10:59

marc_s

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answered Jun 28, 2017 at 11:20

Alex Romanov

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2 Comments

DolDurma Over a year ago

@Alexander Romanov could you help me on this topic: stackoverflow.com/q/45293506/1830228

Qadir Hussain Over a year ago

What rubbish. why they do such stupid things :) BTW this worked. thanks

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