Hello - probably a beginner's question. I was looking at `VisualTransformation`to add some simple tr...

# compose

[v79]

Hello - probably a beginner's question. I was looking at `VisualTransformation`to add some simple transformation to a `OutlineTextField`(like adding currency formatting, or percentage % display). But as soon as I add `

class PercentageVisualTransformation : VisualTransformation {
    override fun filter(text: AnnotatedString): TransformedText {
        TODO("Not yet implemented")
    }
}

The code no longer compiles with an error message: Inheritance from an interface with '@JvmDefault' members is only allowed with -Xjvm-default option - I'm not comfortable changing compiler options for what, I thought, should be a simple thing to do. Any suggestions?

[Joseph Hawkes-Cates]

I’ve used VisualTransformation within my project without having to set that compiler option so definitely seems odd

[Joseph Hawkes-Cates]

Don’t see anything in yours that stands out as fundamentally different from mine. Maybe try restarting/invalidating caches in AS?

[Joseph Hawkes-Cates]

I’m on Compose 1.2.1, though. So if you’re on a new version it’s possible something changed in VisualTransformation

[v79]

Pretty sure I'm on 1.2.1 as well - whatever the default for a new Android Studio project is! Though I have added Material3 rc1 to the project. I'll try the cache thing in the morning.

[Albert Chang]

Material 3 1.0.0-rc01 transitively depends on Compose UI 1.3.0-rc01.

[v79]

I tried changing my compose version 1.3.0-rc01 but I still get the same error message.
Not important just now, I'll stay away from VisualTransformation. I'm still learning, just keen to learn from the most modern approaches.

[Joseph Hawkes-Cates]

Yeah, even looking at the head of the source code for VisualTransformation I don’t see a default impl for the filter method or any other interface defaults.

[Joseph Hawkes-Cates]

Maybe double check that you’re getting the androidx.compose.ui.text.input.VisualTransformation and not something from some other package?

[v79]

Oh dear, I'm getting the same error (Inheritance from an interface with '@JvmDefault' members is only allowed with -Xjvm-default option) from a completely different Android library now - extending from ViewModelProvider.Factory. Must have something wrong with my project setup in gradle.

[v79]

I have moved to the "bleeding edge" - Kotlin 1.7.20, Compose compiler 1.3.2, compose 1.3.0-rc01 etc, and the project now compiles and runs. Good thing this is just a training/hobby project for me!

[Joseph Hawkes-Cates]

Glad you sorted it out. Definitely an odd error, but the issue being related to the compose compiler and/or kotlin version kind of makes sense