Build fails on Android Studio 3.4.x and 3.5, since libraries officially migrated to `androidx`

[dpezely]

Thank you so much for publishing this wonderful guide with source code!

Would you be so kind as to do a quick update, please? There were significant changes in the Android development world since your post in January 2019.

For instance, as of May 2019, Google recommends Kotlin for new development of Android apps-- you were one step ahead! Migration to androidx is out of preview and official, such that android.support.v7.app becomes androidx.appcompat.app, etc. As noted in comments to the blog post, there are deprecation warnings when running the python-based utilities.

Would you also note library versions used, please?

The Rust parts seem fine as of rustc v1.37.0, as expected.

As I'm new to both Kotlin and Android development, it would be a while before I'd be able to submit a PR with any confidence for this issue-- sorry.

Thanks!

[dpezely]

Since PR#2 addresses specifics of what I've asked above, here's a broader example with all files for a deployable app which began with only the Visly blog post and code: (i.e., no prior mobile or Android or Kotlin experience-- just lots of pure Rust development over the years)

native mobile app using Kotlin + Rust

Thanks again for putting your blog post and code out there!