Adding Java/Kotlin Code to an application

Adding native code to an application ​

There are different ways to add native code to an Android application. You can add .jar and .aar files, or Java/Kotlin source files in App_Resources/Android/libs and App_Resources/Android/src respectively.

App_Resources/
├─Android/
│├─app.gradle
│├─libs/
││├─HelloAndroidLib.aar# Android Archive
││└─HelloJavaLib.jar# Java Archive
│└─src/
│└─main/
│├─java/
││├─com/example/HelloKotlin.kt# Kotlin source code
││└─com/example/HelloJava.java# Java source code
│└─res/
└─...more

Adding Java code ​

Define the java file in App_Resources/Android/src/main/java.

// HelloJava.java
package com.example;

publicclassHelloJava {
public String getString() {
return"Hello from Java!";
 }
}

Given the example above, your JavaScript or TypeScript code can reference the Java code by using the full class name:

consthelloJava=new com.example.HelloJava()
console.log('Java says: '+ helloJava.getString())
// prints: Java says: Hello from Java!

declareconstcom:any

Adding Kotlin code ​

Configuring Kotlin ​

Enable kotlin ​

When using Kotlin, it must be enabled first.

Set useKotlin=true in App_Resources/Android/gradle.properties (create the file if it doesn't exist).

useKotlin=true

Configure Kotlin version ​

Configure the version of Kotlin to use in the application in App_Resources/Android/before-plugins.gradle (create the file if it doesn't exist).

project.ext {
 kotlinVersion ="1.9.10"
}

Using kotlin ​

Define the kotlin file in App_Resources/Android/src/main/java.

// HelloKotlin.kt
packagecom.example

classHelloKotlin {
val hello ="Hello from Kotlin!"
}

Given the example above, your JavaScript or TypeScript code can reference the Kotlin code by using the full class name:

consthelloKotlin=new com.example.HelloKotlin()
console.log('Kotlin says: '+ helloKotlin.hello)
// prints: Kotlin says: Hello from Kotlin!

declareconstcom:any

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