使用Android Studio 3.0 Canary 7无法生成AAR / JAR

Question

So, the title pretty much sums up my problem. Anyone know how to fix it? Last time I build apk, it work fine on AS 2.X, but, I'm now developing with Kotlin so, I have to use AS 3.0.

I use AS 3.0 Canary 7 (This project is a fresh project)

This is my dummy class in my library (Stored in "domain".library.mylibrary)

class Test {
    fun hello(): String {
        return "hello"
    }
}

And this is my (mylibrary) gradle:

apply plugin: 'com.android.library'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.0"


    defaultConfig {
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    implementation 'com.android.support:appcompat-v7:26.0.0-beta2'
    testImplementation 'junit:junit:4.12'

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" //Declared in project level gradle: ext.kotlin_version = '1.1.3-2'
}

My gradlew.bat clean build --info log: https://pastebin.com/bfTZ5s4e

Answer 1

Android Studio does not generate a jar by default, but rather an AAR file. If you want to get a jar output , you need to implement apply plugin: 'maven-publish' on top of your mylibrary/gradle.build file and read the following document: Chapter 36. Maven Publishing (new)

Another note, is that I would suggest you not to use ProGuard directly on your release artifact, but rather provide a consumer ProGuard file and let the users of your library to handle that task, otherwise they will have a hard time referencing obfuscated code. Read my answer on this here

While the build task may generate an output, it is known that the assemble task (or assembleRelease ) is the one that will generate your aar output.

Try running the following command:

./gradlew clean assembleRelease

and check the output in /mylibrary/build/outputs/apk/release/ if I am not mistaken.