调用@Composable函数的函数必须用@Composable标注

Question

下面是我的代码，而构建代码我得到这个错误

调用@Composable函数的函数必须用@Composable注释标记

@Composable调用只能发生在@Composable函数的上下文中

@Composable调用只能发生在@Composable函数的上下文中

显示错误

@Composable
public fun MessageCard(msg: Message) {
Text(text = msg.author)
Text(text = msg.body)
}

完整代码

class LayoutList : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
MessageCard(Message("Android", "Jetpack Compose"))
}
}
}

@Composable
public fun MessageCard(msg: Message) {
Text(text = msg.author)
Text(text = msg.body)
}

@Preview
@Composable
fun PreviewMessageCard() {
MessageCard(
msg = Message("Colleague", "Hey, take a look at Jetpack Compose, it's great!")
)
}
data class Message(val author: String, val body: String)```

Answer 1

因为每个可组合函数都应该从另一个可组合函数调用。请参阅此解决方案，以便您理解并希望对您有用，

Jetpack compose AppBarIcon抱怨调用@Composable函数的函数必须用@Composable&quot标记