Introducation to Swift for Android

Andrew Druk @Readdle

Swift Android Toolchain: https://bintray.com/readdle/swift-android-toolchain/swift-android-toolchain
Swift Android Gradle plugin: https://bintray.com/readdle/maven/swift-android-gradle
Blueprint project: https://github.com/andriydruk/swift-android-architecture

Transcript

1. Introduction to Swift for Android Andrew Druk
3. Spark for Android
4. Cross-platform native mobile development C++ Swift Kotlin Native Standart library STD + STL Foundation Korlin Native Runtime Memory Manual ARC ARC Multithreading pthread (for POSIX) GCD Kotlin routines Build system and third-party libs autoconf -> configure -> make, CMake, ninja, etc. Swift package Manager Gradle Objective-C interoperability Objective-C++ Just works™ One way
5. Swift Android Compiler C Frontend C++ Frontend ARM Backend ARM64 Backend x86 Backend x86_64 Backend C C++ ARM ARM64 x86 x86_64 Common Optimizer Swift Frontend Swift LLVM IR LLVM IR
6. Current compiler limitation • Only Mac • Only armv-7a (or with legacy mode on arm64) • Android 5.0+ • + 32 Mb to apk file
7. Swift Android Toolchain git clone https:!//github.com/readdle/swift-android-toolchain export SWIFT_ANDROID_HOME=$HOME/android/swift-android-4.0d export PATH=$ANDROID_NDK_HOME:$PATH export PATH=$SWIFT_ANDROID_HOME/bin:$SWIFT_ANDROID_HOME/build-tools/current:$PATH wget https:!//dl.bintray.com/readdle/swift-android-toolchain/swift-android-4.0d.zip swift android tools !--update OR PROFILE: UPDATE ANDROID TOOLS:
8. Swift Android Toolchain swift-build swift package update swift-test Build packages: Test packages: Update dependencies:
9. Swift Android Toolchain !// project.gradle buildscript { repositories { maven { url "https:!//dl.bintray.com/readdle/maven" } !// … }2 dependencies { classpath 'com.readdle.android.swift:gradle:1.1.3' !// … }1 }0 !// app.gradle apply plugin: ‘com.readdle.android.swift' swift { cleanEnabled true debug { extraBuildFlags("-Xswiftc", "-DDEBUG") } }
10. Java Interoperability public func swiftFunc(str: String) !-> String? @_silgen_name("Java_com_readdle_swiftjava_sample_Sample_func") public func Java_com_readdle_swiftjava_sample_Sample_func(env: UnsafeMutablePointer<JNIEnv?>, javaString: jstring) !-> jstring? { let swiftString: String do { swiftString = try String.from(javaObject: this) }4 catch { _ = JNI.api.ThrowNew(JNI.env, SwiftRuntimeErrorClass, "Error") return nil }3 let result = swiftFunc(str: swiftString) do { return try result!?.javaObject() }2 catch { _ = JNI.api.ThrowNew(JNI.env, SwiftRuntimeErrorClass, "Error") return nil }1 }0
11. Swift Android Annotation Processor @SwiftValue @SwiftReference @SwiftDelegate(protocols = {“ProtocolName"}) Java annotations:
12. Swift Android Annotation Processor @SwiftValue public class SampleValue { @NonNull public String str1; @NonNull public String str2; @NonNull public String str3; !// Swift JNI constructor public SampleValue() { }1 }0 public struct SampleValue: Codable { public var str1: String public var str2: String public var str3: String }2
13. Swift Android Annotation Processor public class SampleReference { public func getRandomValue() !-> SampleValue { return SampleValue(str1: "1", str2: "2", str3: "3") }3 }2 @SwiftReference public class SampleReference { !// Swift JNI private native pointer private long nativePointer = 0L; !// Swift JNI private constructor private SampleReference() { }1 !// Swift JNI release method public native void release(); @NonNull public native SampleValue getRandomValue(); }0
14. Swift Android Annotation Processor public protocol SampleBlockDelegate { func onCall() }1 @SwiftDelegate(protocols = {"SampleBlockDelegate"}) public interface SampleInterfaceDelegateAndroid { @SwiftCallbackFunc void onCall(); }0
15. ART (JAVA) NATIVE (SWIFT) Blueprint Project git clone https://github.com/andriydruk/swift-android-architecture Activity VIEW VIEW MODEL REPOSITORY (+ in-memory cache) GENERATED JNI
16. XCTest compile packages compile tests copy binaries on Android >>> run executable copy resources (optional) >>> copy results (optional) <<<
17. Debugging
18. Debugging
19. Debugging
20. Profiling
21. Profiling
22. What’s next? • Swift + Kotlin = ❤ • ARM64 compiler (deadline August 2019) • X86, X86_64 compiler (Chromebook support) • LLDB with Swift support: client and server
23. Sources • https://github.com/apple/swift/blob/master/docs/Android.md • https://github.com/SwiftJava/swift-android-kotlin/blob/master/ README.md • https://modocache.io/how-to-port-the-swift-runtime-to-android • https://medium.com/@ephemer/why-we-put-an-app-in-the- android-play-store-using-swift-96ac87c88dfc • https://romain.goyet.com/articles/ running_swift_code_on_android/
24. Thank you. andriy.druk@gmail.com andriydruk.com @AndriyDruk