Rust with Android Studio or Xcode iOS

Android Studio

• Android Studio Arctic Fox | 2020.3.1 Patch 2
• Android SDK Platform 31
• Android NDK 24.0.8215888
• Android SDK Build-Tools 31.0.0
• Android SDK Command-line Tools
• Android SDK Platform-Tools

Config: Tools >> SDK Manager >> SDK Tools (middle tab):

Rust

Install rust on your PC from rustup, then add some Android targets (arm64, arm, x86_64, x86) for rust.

rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android

Uses rust-android-gradle plugin, so is built with the command:

gradlew cargoBuild

# build release version
./gradlew assembleRelease

Function naming convention

In src/lib.rs you need to name the function according to the following naming convention in order to make it available in Java.

If the Java function is called greeting and it is saved in a file named RustBindings.java pulled from package com.krupitskas.pong then in Rust the function name is:

Java	package name	filename	function name
Java	com_krupitskas_pong	RustBindings	greeting

Which would look like this:

Java_com_krupitskas_pong_RustBindings_greeting(...)

Python

Install Python on your PC.

In macOS Monterey 12.3 and above, python was removed by Apple, you must install Python3 by yourself, then run this command to make python3 as python.

ln -s -f /usr/local/bin/python3 /usr/local/bin/python

iOS

Prepare

• macOS / Xcode
• curl https://sh.rustup.rs -sSf | sh
• rustup target add aarch64-apple-ios aarch64-apple-ios-sim x86_64-apple-ios
• cargo install cargo-lipo
• cargo install cbindgen

Automation build script

set -e
PATH="$PATH:${HOME}/.cargo/bin"
RUST_PROJ=${PROJECT_DIR}/../..
cd "${RUST_PROJ}"
cargo lipo --release
cbindgen --config cbindgen-ios.toml -l C -o target/greetings.h

References

• Rust Android Gradle Plugin
• One more plugin to build Rust for Android
• Cargo NDK for Android projects
• Running Rust on Android
• Building and Deploying a Rust library on iOS
• Building and Deploying a Rust library on Android
• Render Fractal image in Android bitmap with Rust
• How to Use Rust in iOS Apps
• Workshop: Use Rust in iOS Apps

Done!