Create an Android Library plug-in

1. In your Unity project, create a

   MyFeature.androidlib

   folder. This folder will represent a Gradle module.
2. (Optional) Unity will create a

   build.gradle

   for your

   .androidlib

   automatically on build, but if you want to override it, create a file named

   build.gradle

   inside the

   MyFeature.androidlib

   folder and add the following code:

   apply plugin: 'com.android.library'dependencies {    implementation fileTree(dir: 'libs', include: ['*.jar'])}android {    namespace "com.company.myfeature"    compileSdk getProperty("unity.compileSdkVersion") as int    buildToolsVersion getProperty("unity.buildToolsVersion")    compileOptions {        sourceCompatibility JavaVersion.valueOf(getProperty("unity.javaCompatabilityVersion"))        targetCompatibility JavaVersion.valueOf(getProperty("unity.javaCompatabilityVersion"))    }    defaultConfig {        minSdk getProperty("unity.minSdkVersion") as int        targetSdk getProperty("unity.targetSdkVersion") as int        ndk {            abiFilters.addAll(getProperty("unity.abiFilters").tokenize(','))            debugSymbolLevel getProperty("unity.debugSymbolLevel")        }    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'        }    }}

3. Create the following folder structure inside the

   MyFeature.androidlib

   folder:

   • src/main

   • src/main/java/com/company/feature

     (or adjust the package path to match your desired package name)
4. Create an

   AndroidManifest.xml

   file inside the

   src/main

   folder and add the following code:

   <?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"/>

5. Create a Java or Kotlin file (for example,

   Controller.java

   ) inside the

   src/main/java/com/company/feature/

   folder and add the following code:

   package com.company.feature;public class Controller{    public static String getFoo()    {        return "This is my feature";    }}

Use Android Library plug-ins

using UnityEngine;public class FeatureUser : MonoBehaviour{    readonly string ControllerName = "com.company.feature.Controller";    AndroidJavaClass m_Class;    void Start()    {        m_Class = new AndroidJavaClass(ControllerName);    }    private void OnGUI()    {        GUILayout.Space(100);        GUI.skin.label.fontSize = 30;        if (m_Class != null)        {            GUILayout.Label($"{ControllerName}.getFoo() returns " + m_Class.CallStatic<string>("getFoo"));        }        else        {            GUILayout.Label($"{ControllerName} was not found?");        }    }}

Develop Android Library plug-ins

1. Open the Build Profiles (menu: File > Build Profiles) window.
2. From the list of platforms in the Platforms panel, select Android.
3. Under Platform Settings, enable Export Project and Symlink Sources.
4. Select Export.
5. Select the destination folder and click Select Folder to start the export process.
6. After Unity exports the Gradle project, import the Gradle project into Android Studio.

Additional resources

• Export an Android project