Error with compile kotlin class extend java class

Question

I have next java class:

public interface Callbacks {
     void onImagePickerError(Exception e, Library.ImageSource source, int type);

    void onImagePicked(File imageFile, Library.ImageSource source, int type);

    void onCanceled(Library.ImageSource source, int type);
}

and next abstract class extended interface:

public abstract class DefaultCallback implements Callbacks {

    @Override
    public void onImagePickerError(Exception e, Library.ImageSource source, int type) {
    }

    @Override
    public void onCanceled(Library.ImageSource source, int type) {
    }
}

In my case need in one place extend this interface and use it when callback coming from outher library.

In my android kotlin code looks like this:

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        Library.handleActivityResult(requestCode, resultCode, data, this, callback)
    }

private val callback = object: Library.Callbacks {
    override fun onImagePicked(imageFile: File?, source: Library.ImageSource?, type: Int) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    override fun onImagePickerError(e: Exception?, source: Library.ImageSource?, type: Int) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }

    override fun onCanceled(source: Library.ImageSource?, type: Int) {
        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
    }
}

It's nothing special. But in compile time i have error:

Error:(239, 28) Object is not abstract and does not implement abstract member public abstract fun onImagesPicked(@NonNull p0: (Mutable)List<File!>, p1: Library.ImageSource!, p2: Int): Unit defined in github.library.path.Library.Callbacks
Error:(240, 9) 'onImagePicked' overrides nothing

1) why error have incorrect method name - onImagesPicked

2) why this not compile?

I try this and it's worked!

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        Library.handleActivityResult(requestCode, resultCode, data, this, object: DefaultCallback() {
            fun onImagePicked(imageFile: File?, source: Library.ImageSource?, type: Int) {
                log("emm") //not worked and method useless
            }

            override fun onImagesPicked(p0: List<File>, p1: Library.ImageSource, p2: Int) {
                photoFileUri = Uri.fromFile(p0[0])
                setUpPhoto()
                log("worked") //worked! how?
            }
        })
    }

does not implement abstract member public abstract fun onImagesPicked(@NonNull p0: (Mutable)List<File!>, ...) - It seems the method should accept List argument, but you declared a File parameter: imageFile: File?. — Vince
– Vince, Commented Feb 1, 2018 at 22:58
What I'm saying is the method you declared doesn't match the method that's required. You need override fun onImagesPicked(p0: List<File>, ...), not override fun onImagesPicked(imageFile: File?, ...). That's why the method which logs "worked" works: it shares the same method signature as the method that is required, while your onImagesPicked(imageFile: File?, ...) does not match. You cannot simply change the parameter types & expect overriding to work. — Vince
– Vince, Commented Feb 1, 2018 at 23:16
It looks like the Callbacks interface that Kotlin is seeing is not the same Callbacks interface you're seeing in your editor. Do you need to rebuild something? Maybe your pom/gradle.build is out of date? Some dependency somewhere may need to be fixed. — Paul Hicks
– Paul Hicks, Commented Feb 2, 2018 at 0:29

asm0dey · Accepted Answer · 2018-02-02 06:29:55Z

1

It's pretty obvious: your private val callback doesn't have method onImagesPicked(p0: List<File>).

But there may be several causes of this error:

Kotlin sees some another Callbacks interface then public interface Callbacks which we see. It can be baecause of
1. Typo in import
2. Wrong import
3. Another version of library
The code you've posted above is not completely up-to-date

answered Feb 2, 2018 at 6:29

asm0dey

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1 Comment

abbath0767 Over a year ago

you right - Another version of library. Invalidate Cache -> Restart -> Clean -> Rebuild help .

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