Why is it when I try to use `MaterialTheme.colors.*` I get an error of "@Composable invocations can ...

# coroutines

[Colton Idle]

Why is it when I try to use MaterialTheme.colors.* I get an error of "@Composable invocations can only happen from the context of...", but if I just use a string there instead then it works fine, which shows that my @Composable is actually setup correctly. Code snipipets in thread.

[Colton Idle]

LazyColumn(content = {
    items(
        listOf(
            "test1",
            "test2",
        )
    ) {
        Text(text = it.toString())
    }
})

This works

[Colton Idle]

LazyColumn(content = {
    items(
        listOf(
            MaterialTheme.colors.primary,
            MaterialTheme.colors.onSecondary,
        )
    ) {
        Text(text = it.toString())
    }
})

This does not work.

[rnett]

I don't have the code in front of me, I'm guessing some part MaterialTheme of is @Composable (because of the ambient). Note that `LazyColumn`'s content isn't composable, but the `items`'s content is.

[Colton Idle]

So what's my solution? I can't use MaterialTheme.colors.* as part of my input data?

[Adam Powell]

/me gazes at the current channel 🤔

[Colton Idle]

Whoops!

[Adam Powell]

Anyway it's because the LazyColumn content lambda isn't itself a composable function

[Adam Powell]

But the body of the items blocks are

[Colton Idle]

I just want to reference these colors... 😭

[Adam Powell]

Make the list outside of the actual LazyColumn call and reference the captured val inside

[Colton Idle]

Hm. I just pulled it out to a top level var in the file

val list = listOf(
    MaterialTheme.colors.primary,
    MaterialTheme.colors.onSecondary,
)

and it has the same error.

[Adam Powell]

yes, it needs to be in a @Composable function.

val list = listOf(
    MaterialTheme.colors.primary,
    MaterialTheme.colors.onSecondary,
)
LazyColumn {
  items(list) {
    // ...
  }
}

[Colton Idle]

It worked. And I dont wanna lie and say im not defeated. lol

I feel so stupid. oh well. Thanks @Adam Powell