JSON反序列化在Jetpack Compose中不起作用

在Jetpack Compose中解码(反序列化)JSON数据似乎很简单,但我遇到了一个无法解决的问题。我使用的是最新版本的Android Studio,我不确定 .decodeFromString() 函数在AS中工作,还是我应该使用IntelliJ IDEA?这是我的代码:

dependencies {
    implementation(libs.kotlinx.serialization.json)
}

import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.Serializable
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.json.Json

class MainActivity : ComponentActivity() {
    @OptIn(ExperimentalSerializationApi::class)
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            JSONsibleTheme {
                DecodedText()
            }
        }
    }
}

@Serializable
data class User(val id: Int, val name: String)

@ExperimentalSerializationApi
@Composable
fun DecodedText() {
    val jsonString = """
    {
        "user_id": 722549,
        "name": "John Smith",
    }
    """
    val deserialized = Json.decodeFromString<User>(string = jsonString)
    Text(
        text = "${deserialized.name}, ${deserialized.id}"
    )
}

我无法在模拟器或真实设备上运行此代码,因为 @Serializable 注释不适用(黄色下划线)。警告说:

// kotlinx.serialization compiler plugin is not 
// applied to the module, so this annotation would 
// not be processed. Make sure that you've setup 
// your buildscript correctly and re-import project.