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Are you an LLM? You can read better optimized documentation at /guide/native-code/android.md for this page in Markdown format

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.

bash

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.

java

// HelloJava.java
package com.example;

public class HelloJava {
  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:

typescript

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

Note

When using TypeScript, you may need to generate typings, or alternatively declare the top level package name as any.

typescript

declare const com: 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).

ini

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).

groovy

project.ext {
  kotlinVersion = "1.9.10"
}

Using kotlin

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

kotlin

// HelloKotlin.kt
package com.example

class HelloKotlin {
  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:

typescript

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

Note

When using TypeScript, you may need to generate typings, or alternatively declare the top level package name as any.

typescript

declare const com: any

Previous: ←Adding Native Code
Next: Adding ObjectiveC/Swift Code→

On this page

Adding native code to an application
Adding Java code
Adding Kotlin code
1. Configuring Kotlin
2. Using kotlin

Contributors

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Adding native code to an application ​

Adding Java code ​

Adding Kotlin code ​

Configuring Kotlin ​

Enable kotlin ​

Configure Kotlin version ​

Using kotlin ​

Contributors

Adding native code to an application

Adding Java code

Adding Kotlin code

Configuring Kotlin

Enable kotlin

Configure Kotlin version

Using kotlin