Hi everyone. Am I allowed to declare a `@Composable` method on an interface? something like: ```inte...

# compose

[Chris Fillmore]

Hi everyone. Am I allowed to declare a @Composable method on an interface? something like:

interface ImageLoader {
  @Composable
  fun Image(url: String)
}

I have similar code implemented right now, which compiles but throws NoSuchMethodError at runtime

[Zach Klippenstein (he/him) [MOD]]

It’s not crazy, it’s definitely allowed, and the Compose code itself does this!

[Chris Fillmore]

ok interesting, the exception I’m getting is

java.lang.NoSuchMethodError: No interface method Image(Ljava/lang/String;Ljava/lang/String;Landroidx/compose/ui/Modifier;Landroidx/compose/ui/layout/ContentScale;Landroidx/compose/runtime/Composer;I)V

[Adam Powell]

is the compose compiler plugin enabled when compiling both the interface and the implementation class?

[Chris Fillmore]

oooh what a good question… please hold

[Adam Powell]

the telltale sign is in that signature: compose adds the Composer and the Int (the I ) at the end of a @Composable function's parameter list

[Chris Fillmore]

thanks for the tip! Yes, I’d forgotten to enable compose compiler