Beyond the Impl: 3 Ways to Distribute Your Android Library (And How to Choose)

We’ve all been there. You’ve spent weeks perfecting a gorgeous custom UI component, a bulletproof networking wrapper, or a highly optimized utility class. It works flawlessly in your sample app. But now comes the real challenge: How do you actually share it with the world — or even just with your other internal projects?

In the Android ecosystem, building a library is only half the battle. Choosing how to distribute it can drastically impact your development velocity, CI/CD pipelines, and the developer experience (DX) of the people consuming your code.

Generally, you have three primary pathways to integrate an Android library into a project. In this article, we’ll dive deep into how to set up each method, step-by-step, and break down a side-by-side comparison to help you choose the perfect strategy for your workflow.

Method 1: The Gold Standard — Publishing to Maven Central

If your goal is to build an open-source library that any developer across the globe can implement with a single line of code, Maven Central is the ultimate destination. Since the sunset of JCenter, Maven Central has become the undisputed standard repository for Android dependencies.

How It Works

Publishing here means your compiled library (.aar or .jar) along with its metadata (.pom file) is hosted on Sonatype’s servers. When a developer adds your dependency, Gradle knows exactly where to fetch it.

Step-by-Step Implementation

1. Claim your Namespace: Register for a Sonatype JIRA account and verify ownership of your domain (e.g., com.yourdomain). If you don't own a domain, you can use your GitHub profile (e.g., io.github.yourusername).
2. Set up GPG Signing: Maven Central strictly requires all artifacts to be cryptographically signed. Generate a GPG key pair locally and distribute the public key to a keyserver.
3. Configure the maven-publish Plugin: In your library’s build.gradle.kts, apply the plugin and configure your publication:

plugins {
    id("maven-publish")
    id("signing")
}

publishing {
    publications {
        register<MavenPublication>("release") {
            groupId = "io.github.yourusername"
            artifactId = "mylibrary"
            version = "1.0.0"
            afterEvaluate {
                from(components["release"])
            }

            // Maven Central requires POM metadata
            pom {
                name.set("My Awesome Library")
                description.set("A library that does amazing things on Android.")
                url.set("https://github.com/yourusername/mylibrary")
                licenses {
                    license {
                        name.set("The Apache License, Version 2.0")
                        url.set("http://www.apache.org/licenses/LICENSE-2.0.txt")
                    }
                }
            }
        }
    }
}
signing {
    sign(publishing.publications["release"])
}

4. Publish: Run ./gradlew publishReleasePublicationToSonatypeRepository (or use modern plugins like gradle-nexus-publish-plugin to simplify the staging process) to push your code to the staging repository, then close and release it via the Sonatype dashboard.

Method 2: The Old School Quick-Fix — Generating a Raw JAR/AAR File

Sometimes, you don’t want a middleman. You don’t want servers, network requests, or registration forms. You just want a file you can physically hand over to a colleague or drag-and-drop into a legacy project. For pure Java/Kotlin code, you generate a JAR; for libraries containing Android resources (layouts, drawables, manifests), you generate an AAR (Android Archive).

How It Works

You compile the library locally, grab the output file from the build folder, copy it into the target project’s libs/ directory, and tell Gradle to read it locally.

Step-by-Step Implementation

• Assemble the Library: In your library project terminal, run:
• Bash

./gradlew assembleRelease

2. Locate the File: Navigate to [your-library-module]/build/outputs/aar/ (or libs/ for standard Java/Kotlin modules) and copy the release.aar or *.jar file.

3. Import into the Target Project: Paste this file into the app/libs/ directory of your consuming project.

4. Configure the Consuming App’s build.gradle.kts: Tell Gradle to look inside the libs folder:

dependencies {     
implementation(files("libs/your-library-file.aar"))     
// Or link all files in the directory:     
// implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar", "*.aar")))) 
}

Method 3: The Local Sandbox — Publishing to Maven Local

What if you are developing both the library and an application simultaneously? You don’t want to go through the lengthy process of publishing to Maven Central just to test a minor bug fix, and copy-pasting an AAR file every five minutes is a recipe for carpal tunnel syndrome.

Enter Maven Local — a hidden dependency repository living right on your development machine (usually located at ~/.m2/repository).

How It Works

You publish the library to your machine’s local directory. Your target app, running on the same machine, looks into this directory before hitting the internet.

Step-by-Step Implementation

1. Configure the Publication: Ensure the maven-publish plugin is applied in your library's build.gradle.kts (similar to Method 1, but you don't need strict GPG signing or complex POM metadata for local testing).

2. Publish Locally: Run the following command in your library terminal:

./gradlew publishReleasePublicationToMavenLocal -Pversion=6.0.10

3. Configure the Target Project: Open your consuming project. To allow Gradle to see your local machine’s repository, you need to declare mavenLocal() in your repository configuration.

Depending on your project structure, open your settings.gradle.kts (or your root build.gradle.kts) and add it to the top of the repository lists:

pluginManagement {     
repositories {         
mavenLocal() // <--- Look here first!         
google()         
mavenCentral()     
} 
} 

dependencyResolutionManagement {     
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)     
repositories {         
mavenLocal() // <--- Look here first!         
google()         
mavenCentral()     
} 
}

4. Implement and Update: Add the dependency in your app’s build.gradle.kts just like a remote dependency:

dependencies {     
implementation("com.yourdomain:mylibrary:1.0.1-SNAPSHOT") 
}

Pro Tip: Always suffix your local test versions with -SNAPSHOT (e.g., 1.0.0-SNAPSHOT). This tells Gradle not to cache the dependency aggressively, ensuring that when you run publishReleasePublicationToMavenLocal again, your app immediately picks up the new changes.

The Verdict: How to Choose Your Tool

• Choose Maven Central if you are launching a product for the developer community or shipping an enterprise-grade library across decentralized teams. It gives your project maximum credibility and seamless integration.
• Choose Raw JAR/AAR if you need to pass a quick proof-of-concept to a client, work completely offline, or are dealing with strict enterprise environments where internal network repositories aren’t set up yet.
• Choose Maven Local if you are actively coding a library and a companion app simultaneously. It bridges the gap between active development and realistic dependency simulation without polluting the internet with broken test versions.

How do you usually distribute your Android libraries? Let’s talk about your workflows, favorite Gradle plugins, or any automation tips you use in the comments below! 🚀