我正在尝试学习如何在 Kotlin 编程语言中实现 Retrofit2 和 Moshi。但是,我似乎在尝试编译我的代码时遇到了麻烦。
我定义了以下数据类/模型,这些数据类/模型映射到我从正在点击的 api 收到的 json 响应:
@JsonClass(generateAdapter = true)
data class Catalogs(
val languages: List<LanguageCatalog>
)
@JsonClass(generateAdapter = true)
data class LanguageCatalog(
val direction: String,
val identifier: String,
val title: String,
val resources: List<ResourceCatalog>
)
@JsonClass(generateAdapter = true)
data class Project(
val identifier: String,
val sort: Int,
val title: String,
val versification: String?
)
@JsonClass(generateAdapter = true)
data class ResourceCatalog(
val identifier: String,
val modified: String,
val projects: List<Project>,
val title: String,
val version: String
)
然后我有一个定义 API 行为的接口:
interface Door43Service
{
@GET("v3/catalog.json")
fun getFormat() : Observable<Catalogs>
companion object
{
fun create(): Door43Service
{
val retrofit = Retrofit.Builder()
.addCallAdapterFactory(
RxJava2CallAdapterFactory.create()
)
.addConverterFactory(
MoshiConverterFactory.create()
)
.baseUrl("https://api.door32.org/")
.build()
return retrofit.create(Door43Service::class.java)
}
}
}
最后,我在 main 函数中实现了所有内容,以从 api 获取 json 数据:
val door43Service by lazy {
Door43Service.create()
}
var disposable: Disposable? = null
fun main(args: Array<String>)
{
door43Service.getFormat()
.subscribe(
{ result -> println(result.languages)},
{ error -> println(error.message)}
)
}
从 api 返回的数据很长,但是可以在http://api-info.readthedocs.io/en/latest/door43.html找到一个示例
我的问题是我的堆栈中出现以下错误:
Exception in thread "main" java.lang.IllegalArgumentException: Unable to create converter for class model.Catalogs
for method Door43Service.getFormat
at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:755)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:741)
at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:172)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170)
at retrofit2.Retrofit$1.invoke(Retrofit.java:147)
at com.sun.proxy.$Proxy0.getFormat(Unknown Source)
at MainKt.main(main.kt:11)
Caused by: java.lang.RuntimeException: Failed to find the generated JsonAdapter class for class model.Catalogs
at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:249)
at com.squareup.moshi.StandardJsonAdapters$1.create(StandardJsonAdapters.java:62)
at com.squareup.moshi.Moshi.adapter(Moshi.java:130)
at retrofit2.converter.moshi.MoshiConverterFactory.responseBodyConverter(MoshiConverterFactory.java:91)
at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:330)
at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:313)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:739)
... 5 more
Caused by: java.lang.ClassNotFoundException: model.CatalogsJsonAdapter
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:236)
乍一看,我的理解是编译器认为我没有为我的 Catalogs 类定义适配器,但我认为应该使用@JsonClass(generateradapter = true)
注释来覆盖。有什么我想念的吗?为什么我的程序不能为我的 Catalogs 类生成适配器?