Moshi未能将0,1反序列化为“Boolean？”

Question

@Retention(AnnotationRetention.RUNTIME)
@JsonQualifier
annotation class BooleanType

class BooleanAdapter {
    @FromJson
    @BooleanType
    fun fromJson(value: Int): Boolean {
        return value == 1
    }

    @ToJson
    fun toJson(@BooleanType value: Boolean): Int {
        return if (value) 1 else 0
    }
}

No JsonAdapter for class java.lang.Boolean annotated [@com.pk.data.serialize.BooleanType()]
....

下面是虚拟数据和单元测试

@JsonClass(generateAdapter = true)
data class HaHaData(
    @BooleanType
    @Json(name = "haha") val haha: Boolean?,
)


 @Test
    fun parseNullBooleanTest() {
        val moshi = Moshi.Builder()
            .add(BooleanAdapter())
            .build()
        val json = "{\"haha\":1}"
        val jsonWithNull = "{\"haha\":null}"
        val data = HaHaDataJsonAdapter(moshi).fromJson(json)
        val dataWithNull = HaHaDataJsonAdapter(moshi).fromJson(jsonWithNull) // exception thrown
        assert(data?.haha== true)
        assert(dataWithNull?.haha == null)
    }

Answer 1

您的fromjson不接受null作为输入。

如果希望null变为false：

fun fromJson(value: Int?): Boolean {
      return 
}

如果您希望null保持null（您还必须修改tojsonfun来接受null):

fun fromJson(value: Int?): Boolean? {
    return value?.let { it == 1 }
}