Moshi:找不到生成的JsonAdapter类为class

问题描述 投票:0回答:3

我正在尽可能接近https://proandroiddev.com/getting-started-using-moshi-for-json-parsing-with-kotlin-5a460bf3935a中的示例,但仍然无法运行。

在我的 Gradle 中,我有

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
}

dependencies {
    implementation "com.squareup.moshi:moshi:1.8.0"
    kapt 'com.squareup.moshi:moshi-kotlin-codegen:1.8.0'
}

我有课

@JsonClass(generateAdapter = true)
data class Movie (
    @Json(name = "vote_count") val voteCount: Int = -1,
    val id: Int,
    val title: String,
    @Json(name = "image_path") val imagePath: String,
    val overview: String
)

当我如下运行测试时

    @Test
    fun testMoshi() {
        val moviesJson: String = """
{
  "vote_count": 2026,
  "id": 19404,
  "title": "Example Movie",
  "image_path": "/example-movie-image.jpg",
  "overview": "Overview of example movie"
} 
        """.trimIndent()

        val moshi: Moshi = Moshi.Builder().build()
        val adapter: JsonAdapter<Movie> = moshi.adapter(Movie::class.java)
        val movie = adapter.fromJson(moviesJson)
    }

失败了

Failed to find the generated JsonAdapter class for class...

我错过了什么?

kotlin moshi
3个回答
2
投票

显然,这是因为我将以下内容放在测试文件夹而不是主文件夹中。

@JsonClass(generateAdapter = true)
data class Movie (
    @Json(name = "vote_count") val voteCount: Int = -1,
    val id: Int,
    val title: String,
    @Json(name = "image_path") val imagePath: String,
    val overview: String
)

当我将其移动到主文件夹时,它就可以工作(因为现在可以生成适配器)


0
投票

在另一种情况下,您应该读取整个堆栈跟踪,但有异常,如下所示:

TestRunner: java.lang.RuntimeException: Failed to find the generated JsonAdapter 
constructor for 'class SomeGenericClass'. Suspiciously, the type was not parameterized 
but the target class 'SomeGenericClassJsonAdapter' is generic. 
Consider using Types#newParameterizedType() to define these missing type variables.
... 
Caused by: java.lang.NoSuchMethodException: SomeGenericClassJsonAdapter.<init> []

然后寻找解决方案。我发现这个适合我的情况:Moshi序列化泛型类“无法找到生成的 JsonAdapter 构造函数...”.


0
投票

我来晚了一点,但除了允许在测试包中生成代码之外,请务必拥有

kaptTest
kaptAndroidTest

implementation("com.squareup.moshi:moshi-kotlin:1.15.1")
kapt("com.squareup.moshi:moshi-kotlin-codegen:1.15.1")
kaptTest("com.squareup.moshi:moshi-kotlin-codegen:1.15.1")
kaptAndroidTest("com.squareup.moshi:moshi-kotlin-codegen:1.15.1")
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