Sample Android Library Publishing to GitHub Package Registry

This Android project showcases the steps to publish and consume Android Libraries on the GitHub Package Registry. It is made up of 2 modules

1. sampleAndroidLib

• Android library module with basic functionality
• Publishes the generated library file onto the GitHub Package Registry
• The build.gradle file inside this module has the code (plugin, tasks and authentication) related to publishing the library

2. app

• Sample Android application module with the build.gradle file that shows the code for consuming an Android library from GitHub Package Registry.

---

Publish Android library to GitHub Package Registry

Step 1 : Generate a Personal Access Token for GitHub

• Inside you GitHub account:
  • Settings -> Developer Settings -> Personal Access Tokens -> Generate new token
  • Make sure you select the following scopes (" write:packages", " read:packages") and Generate a token
  • After Generating make sure to copy your new personal access token. You won’t be able to see it again!

Step 2: Store your GitHub - Personal Access Token details

• Create a github.properties file within your root Android project
• In case of a public repository make sure you add this file to .gitignore for keep the token private
  • Add properties gpr.usr=GITHUB_USERID and gpr.key=PERSONAL_ACCESS_TOKEN
  • Replace GITHUB_USERID with personal / organisation Github User ID and PERSONAL_ACCESS_TOKEN with the token generated in #Step 1

Alternatively you can also add the GPR_USER and GPR_API_KEY values to your environment variables on you local machine or build server to avoid creating a github properties file

Step 3 : Update build.gradle inside the library module

• Add the following code to build.gradle inside the library module

apply plugin: 'maven-publish'

def githubProperties = new Properties()
githubProperties.load(new FileInputStream(rootProject.file("github.properties")))  

def getVersionName = { ->
    return "1.0.2"  // Replace with version Name
}

def getArtificatId = { ->
    return "sampleAndroidLib" // Replace with library name ID
}

publishing {
    publications {
        bar(MavenPublication) {
            groupId 'com.enefce.libraries' // Replace with group ID
            artifactId getArtificatId()
            version getVersionName()
            artifact("$buildDir/outputs/aar/${getArtificatId()}-release.aar")
        }
    }

    repositories {
        maven {
            name = "GitHubPackages"
            /** Configure path of your package repository on Github
             *  Replace GITHUB_USERID with your/organisation Github userID and REPOSITORY with the repository name on GitHub
             */
            url = uri("https://maven.pkg.github.com/GITHUB_USERID/REPOSITORY")

            credentials {
                /**Create github.properties in root project folder file with gpr.usr=GITHUB_USER_ID  & gpr.key=PERSONAL_ACCESS_TOKEN**/
                username = githubProperties['gpr.usr'] ?: System.getenv("GPR_USER")
                password = githubProperties['gpr.key'] ?: System.getenv("GPR_API_KEY")
            }
        }
    }
}

Step 4 : Publish the Android Library onto GitHub Package Registry

Make sure to build and run the tasks to generate the library files inside build/outputs/aar/ before proceeding to publish the library.

• Execute the Publish gradle task which is inside your library module

$ gradle publish

• Once the task is successful you should be able to see the Package under the Packages tab of the GitHub Account
• In case of a failure run the task with --stacktrace, --info or --debug to check the logs for detailed information about the causes.

---

Using a library from the GitHub Package Registry

Currently the GitHub Package Registry requires us to Authenticate to download an Android Library (Public or Private) hosted on the GitHub Package Registry. This might change for future releases

Steps 1 and 2 can be skipped if already followed while publishing a library

Step 1 : Generate a Personal Access Token for GitHub

• Inside you GitHub account:
  • Settings -> Developer Settings -> Personal Access Tokens -> Generate new token
  • Make sure you select the following scopes ("read:packages") and Generate a token
  • After Generating make sure to copy your new personal access token. You won’t be able to see it again!

Step 2: Store your GitHub - Personal Access Token details

• Create a github.properties file within your root Android project
• In case of a public repository make sure you add this file to .gitignore for keep the token private
  • Add properties gpr.usr=GITHUB_USERID and gpr.key=PERSONAL_ACCESS_TOKEN
  • Replace GITHUB_USERID with personal / organisation Github User ID and PERSONAL_ACCESS_TOKEN with the token generated in #Step 1

Alternatively you can also add the GPR_USER and GPR_API_KEY values to your environment variables on you local machine or build server to avoid creating a github properties file

Step 3 : Update build.gradle inside the application module

• Add the following code to build.gradle inside the application module that will be using the library published on GitHub Packages Repository

def githubProperties = new Properties()
githubProperties.load(new FileInputStream(rootProject.file("github.properties")))  

    repositories {
        maven {
            name = "GitHubPackages"
            /*  Configure path to the library hosted on GitHub Package Registry
             *  Replace UserID with package owner userID and REPOSITORY with the repository name
             *  e.g. "https://maven.pkg.github.com/enefce/AndroidLibraryForGitHubPackagesDemo"
             */
            url = uri("https://maven.pkg.github.com/UserID/REPOSITORY")

            credentials {
                username = githubProperties['gpr.usr'] ?: System.getenv("GPR_USER")
                password = githubProperties['gpr.key'] ?: System.getenv("GPR_API_KEY")
            }
        }
    }

• inside dependencies of the build.gradle of app module, use the following code

dependencies {
    //consume library, e.q. 'com.enefce.libraries.sampleAndroidLib:sampleandroidlib:1.0.5'
    implementation '<groupId>:<artifactId>:<version>'
	...
}

License