service.kt

private fun createNativeView(handle: Long) {
    FlutterMain.ensureInitializationComplete(this, arrayOf())

    val nativeView = FlutterNativeView(this, true)

    val callback = FlutterCallbackInformation.lookupCallbackInformation(handle)
    nativeView.runFromBundle(FlutterRunArguments().apply {
        bundlePath = FlutterMain.findAppBundlePath(this@Service)
        libraryPath = callback.callbackLibraryPath
        entrypoint = callback.callbackName
    })
}