CODEWITHSUNDEEP
androidiosjava
Philipp
Philipp

Reputation: 788

Using Java library in iOS project

I am developing a project that requires business logic calculations based on a relative complex rule set. The calucations are to be executed on the following platforms:

The business logic does not depend on any platform specific details but is strictly about "number crunching".

To avoid double implementation for Java and Objective C, which would require elaborate testing and so forth, I would like to create a Java library cotaining the implementation and use it within the iOS app.

What would be the best way to do this? Would it be better to do a native port for Objective C? Would it be better to do it the other way around and write the library in Objective C and use it on Android/Java?

Upvotes: 8

Views: 9534

Answers (5)

fabb
fabb

Reputation: 11745

Kotlin Native now has a Swift integration. So with some build process overhead you could share business logic written in Kotlin with iOS and Android.

https://blog.jetbrains.com/kotlin/2017/12/kotlinnative-v0-5-released-calling-kotlin-from-swift-and-c-llvm-5-and-more/

Upvotes: 4

Edwin Vermeer
Edwin Vermeer

Reputation: 13127

You could try parsing the java library to Objective C using j2objc https://code.google.com/p/j2objc/

Update: This Swift Java bridge is in development https://github.com/SwiftJava/SwiftJava/blob/master/README.md

Upvotes: 4

Sulthan
Sulthan

Reputation: 130102

There is no way how you can use a Java library in an iOS application. Java requires runtime to interpret (JRE) and you don't have that on iOS.

Technically, you could compile a Java library into native code (there are tools for that) but I don't recommend it.

For sharing bussiness code between Android and iOS the best solution is to use pure C libraries. You can call C libraries from Java using JNI (NDK for Android).

Since Obj-C is only a small object layer over pure C, you can use C libraries easily from Obj-C.

You can compile Obj-C for NDK, too, but it is much more complicated than just using C.

Upvotes: 8

pavko_a
pavko_a

Reputation: 507

In this case you should write C implementation of your logic and use JNI for android application.

So you wouldn't repeat yourself

http://en.wikipedia.org/wiki/Java_Native_Interface

Upvotes: 2

Mohammed Habib
Mohammed Habib

Reputation: 606

There is no way you can use any java-related code or application in iOS. You have to work on a native port. iOS doesn't have a jvm.

Upvotes: 1

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