Günter Zöchbauer

The impage_picker and google_sign_in plugin seem to use that as well. Did you check how they do it? - https://github.com/flutter/plugins/blob/9616a32faf6d1066c8f633a30f0bd7dca6fe7e9e/packages/image_picker/android/src/main/java/io/flutter/plugins/imagepicker/ImagePickerDelegate.java - https://github.com/flutter/plugins/blob/d89cae7289ec4f7a51b6e7a17e3f0bb9498d0b19/packages/google_sign_in/android/src/main/java/io/flutter/plugins/googlesignin/GoogleSignInPlugin.java

Please consider asking support questions in one of the other channels listed at http://flutter.io/support .

It looks like `into_service()` was removed https://github.com/hyperium/tonic/commit/475cbcffe4e554dc52f51960210d61fc74e5cf8d