编译kotlin类扩展java类时出错

我有下一个Java类：

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); } 

和下一个抽象类扩展接口：

 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) { } } 

在我的情况下需要在一个地方扩展这个接口，并使用它来自外部库回调。

在我的android kotlin代码看起来像这样：

 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. } } 

没什么特别的 但在编译时，我有错误：

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

1）为什么错误有不正确的方法名称 – 图像被选中

2）为什么不能编译？

我尝试这个，它的工作！

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

Answer 1

这是非常明显的：你的private val callback没有方法onImagesPicked(p0: List) 。

但是这个错误可能有几个原因：

1. Kotlin看到了一些另外的Callbacks接口，然后我们看到了public interface Callbacks 。 这可能是因为
   1. 输入错字
   2. 错误的导入
   3. 另一个版本的库
2. 您上面发布的代码并不完全是最新的