This application builds an inverted index of the Devoxx 2016 talks for an easy offline search. It is implemented both in Java and Rust.
The slides are available at http://dev.unhandledexpression.com/slides/devoxx-2016/
Another example of sharing Rust code between an iOS and Android app, using JNI to talk to Rust, is available at https://github.com/Geal/rust_on_mobile