Rust Programming

I've not heard anything about the NDK being deprecated and nothing on the website seems to indicate it is so in theory as long as your Rust code exports C FFI bindings you could call it using JNI. You'd need at least a minimal Java/Kotlin wrapper and most of your UI would probably end up being done on the Java side of things, although in theory that isn't strictly necessary. There's a cargo plugin (cargo-ndk) that automates a lot of this process.

As one example the Bevy game engine supports iOS and Android targets and doesn't use any native UI elements instead using a GPU canvas (I'm unsure if the implementation is Vulkan, OpenGL, or something else like Metal on iOS) and hooking the native touch controls.