@dg3feiko see here: https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/coroutines-guide-ui.md

the example with JavaFX doesn’t work with the android example app https://github.com/Kotlin/kotlinx.coroutines/blob/master/ui/kotlinx-coroutines-android/example-app/app/src/main/java/com/example/app/MainActivity.kt

Read it. If you replace one or two lines it works on Android.

more than that, is there any example on switching between UI threads and different threads in threadpools? thanks