The "cargo apk" tool already exists to bundle Rust code into a NativeActivity that can be run without needing to write any additional Java code. The API surface

The "cargo apk" tool already exists to bundle Rust code into a NativeActivity that can be run without needing to write any additional Java code. The API surface so provided is more limited than the full toolkit, but could be useful in many domains. It's currently mostly used for games. I am using it for the Android port of piet-gpu, and it's working pretty well.