FaultyCoroutineLaunchBuilder.kt

fun launch(block: suspend () -> Unit) {
    val callback = object : Continuation<Unit> {
        override val context: CoroutineContext = EmptyCoroutineContext
        override fun resumeWith(result: Result<Unit>) {}
    }
    block.createCoroutineUnintercepted(callback).resumeWith(Result.success(Unit))
}

...

downloadButton.setOnClickListener{
    launch {
        textView.text = "Downloading file"
        download("example.com/file.txt", "/sdcard/file.txt")
        textView.text = "Download Complete"
    }
}

...

suspend fun download(url: String, filePath: String) {
    suspendCoroutineUninterceptedOrReturn<Unit> { cont ->
        //Download in a background thread
        thread {
            URL(url).readText().writeTo(File(filePath))
            cont.resumeWith(Result.success(Unit))
        }
        COROUTINE_SUSPENDED
    }
}