https://github.com/SwiftJava/swift-android-kotlin

Kotlin/Swift integration example
https://github.com/SwiftJava/swift-android-kotlin

android-development opengl-es swift

Last synced: 3 months ago
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Kotlin/Swift integration example

• Host: GitHub
• URL: https://github.com/SwiftJava/swift-android-kotlin
• Owner: SwiftJava
• Created: 2017-07-29T09:25:20.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2018-12-20T22:01:03.000Z (almost 6 years ago)
• Last Synced: 2024-07-05T13:46:14.417Z (4 months ago)
• Topics: android-development, opengl-es, swift
• Language: Swift
• Size: 1.18 MB
• Stars: 71
• Watchers: 10
• Forks: 12
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# Kotlin example for the Android Swift toolchain.

![](http://johnholdsworth.com/swiftjava.png?v=1)

An example application for mixing Swift and Kotlin in an Android application. This allows you to reuse model layer code from your iOS application when porting to Android. The "binding" between the Kotlin or Java code and Swift is completely type safe with all JNI code  automatically generated using a script. Building the Swift code is performed using the Swift Package manager and a small gradle plugin.

Requires a build of the latest Android toolchain downloadable [here](http://johnholdsworth.com/android_toolchain.tgz). Once you've extracted the toolchain, run `swift-install/setup.sh` to get started and install the gradle plugin. You then run `./gradlew installDebug` or build the project in Android Studio. Make sure the that the `ANDROID_HOME` environment variable is set to the path to an [Android SDK](https://developer.android.com/studio/index.html). The phone must be api 21 aka Android v5+ aka Lollipop or better (I used an LG K4.)

To create a new application, decide on a pair of interfaces to connect to and from your Swift

code and place them in a [Java Source](https://github.com/SwiftJava/swift-android-kotlin/blob/master/app/src/main/java/com/johnholdsworth/swiftbindings/SwiftHelloBinding.java). Use the command `./genswift.sh` in the [SwiftJava Project](https://github.com/SwiftJava/SwiftJava) to generate Swift (& Java) sources to include in your application or adapt the [genhello.sh](https://github.com/SwiftJava/SwiftJava/blob/master/genhello.sh) script. Your app's only

[Package.swift](https://github.com/SwiftJava/swift-android-kotlin/blob/master/app/src/main/swift/Package.swift)

dependency should be the core JNI interfacing code [java_swift](https://github.com/SwiftJava/java_swift).

This example is coded to work with version 7 of the toolchain which has some additional requirements

to work around requirements of the Swift port of Foundation. The cache directory used by web operations

needs to be setup in the environment variable "TMPDIR". This would usually be the value of

Context.getCacheDir().getPath() from the java side. In addition, to be able to use SSL you

need to add a [CARoot info file](http://curl.haxx.se/docs/caextract.html) to the application's

raw resources and copy it to this cache directory to be picked up by Foundation as follows:

    setenv("URLSessionCertificateAuthorityInfoFile", cacheDir! + "/cacert.pem", 1)

    setenv("TMPDIR", cacheDir!, 1)

If you don't want peer validation you have the following option (not recommended at all)

    setenv("URLSessionCertificateAuthorityInfoFile", “INSECURE_SSL_NO_VERIFY”, 1)

    

## Simple demo of Swift code accessed over JNI.

To build, setup the Gradle plugin, then run `./gradlew installDebug`

This demo is licensed under the Creative Commons CC0 license:

do whatever you want.