我有一个 java 类文件,可以正常工作,但是如果我将其转换为 Kotlin,则会出现一些问题。这是一个Java版本
public class CallbackWrapper<T> implements Callback<T> {
private Wrapper<T> wrapper;
public CallbackWrapper(Wrapper<T> wrapper) {
this.wrapper = wrapper;
}
public void onFailure(Call<T> call, Throwable t) {
wrapper.onResult(t, null);
}
public void onResponse(Call<T> call, Response<T> response) {
wrapper.onResult(null, response);
}
public interface Wrapper<T> {
void onResult(@Nullable Throwable t, @Nullable Response<T> response);
}
}
这就是我毫无问题地使用这个类的方式......
request.enqueue(CallbackWrapper<RegisterResponse> { throwable, response ->
response?.let { callBack.onResponse(response.body() ?: RegisterResponse()) }
throwable?.let { callBack.onFailed(throwable.message!!) }
})
这是转换后的 Kotlin 版本
class CallbackWrapper<T>(private val wrapper: CallbackWrapper.Wrapper<T>) : Callback<T> {
override fun onFailure(call: Call<T>, t: Throwable) {
wrapper.onResult(t, null)
}
override fun onResponse(call: Call<T>, response: Response<T>) {
wrapper.onResult(null, response)
}
interface Wrapper<T> {
fun onResult(t: Throwable?, response: Response<T>?)
}
}
问题是,将其转换为 Kotlin 后,我使用此类的代码块无法正常工作。我不明白它们之间有什么区别。
这是编译错误日志
Error:(17, 63) Type mismatch: inferred type is (???, ???) -> [ERROR :<ERROR FUNCTION RETURN TYPE>] but CallbackWrapper.Wrapper<RegisterResponse> was expected
Error:(17, 65) Cannot infer a type for this parameter. Please specify it explicitly.
Error:(17, 76) Cannot infer a type for this parameter. Please specify it explicitly.