Environment & Swift Package Setup

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Before writing Swift code for Android, you need to set up your development environment and create a Swift package. This segment covers the complete toolchain installation and introduces Swift Package Manager.

Getting Started

Access the starter project from the Materials section in the right sidebar. Open the Starter project in Android Studio.

Installing Swift SDK for Android

The Swift SDK for Android enables cross-compiling Swift code for Android devices. You’ll install the complete toolchain on your development machine.

Prerequisites

To follow along, you’ll need:

Installing swiftly

swiftly is the official Swift toolchain manager. It allows you to install and switch between different Swift versions easily.

Installing Swift 6.3

Now install Swift itself using swiftly:

Installing Swift SDK for Android

This is the critical component that enables cross-compiling Swift code for Android devices.

Setting Up Android Studio and NDK

The Swift SDK for Android requires the Android Native Development Kit (NDK) to link against Android’s C++ libraries. You’ll install the NDK through Android Studio’s SDK Manager.

Linking NDK to Swift SDK

Critical: After installing both the Swift SDK and Android NDK, you need to run a setup script that links them together. This creates a symlink from the Swift SDK’s expected NDK path to your installed Android NDK.

Understanding Swift Package Manager

Now that your toolchain is installed, you’ll learn about Swift Package Manager (SPM) which is the build system you’ll use to create your Swift library.

What is Swift Package Manager?

Swift Package Manager is Swift’s official build system and dependency manager. It provides:

Why Use SPM for Android?

You might wonder why you’re using Swift’s build system for Android development. Here’s why:

Creating Your Swift Package

Now you’ll create a Swift package for your task validation logic. This package will compile to a dynamic library that Android loads at runtime.

Creating the Package Directory

Navigate to your Starter project directory and create the package:

Initializing the Swift Package

Run Swift Package Manager’s initialization command:

Understanding Package.swift

Open Package.swift and examine its structure:

Verifying the Package

Build the package to ensure everything is configured correctly:

Understanding the Build Output

The .build/ directory contains all build artifacts:

Project Structure Diagram

Here’s what your project looks like now:

What You’ve Accomplished

In this segment, you’ve:
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