Gradle config files for publishing to MavenCentral. Full article https://proandroiddev.com/publishing-android-libraries-to-mavencentral-in-2021-8ac9975c3e52 , latest live versions of these in a working repo https://github.com/GetStream/stream-chat-android/tree/develop/scripts

build.gradle (module)

// Lines to add in module level build.gradle file for modules you publish

ext {
    // Provide your own coordinates here
    PUBLISH_GROUP_ID = 'io.getstream'
    PUBLISH_VERSION = '4.8.1'
    PUBLISH_ARTIFACT_ID = 'stream-chat-android-client'
}

apply from: "${rootProject.projectDir}/scripts/publish-module.gradle"

build.gradle (project)

// Lines to add to the project level (root) build.gradle file

// 1a: plugins block application of the publishing plugin
plugins {
    id("io.github.gradle-nexus.publish-plugin") version "1.1.0"
}

// 1b: old plugin syntax for publishing plugin
buildscript {
    dependencies {
        classpath 'io.github.gradle-nexus:publish-plugin:1.1.0'
    }
}

apply plugin: 'io.github.gradle-nexus.publish-plugin'

// 2: applying separate publishing script
apply from: "${rootDir}/scripts/publish-root.gradle"

publish-module.gradle

apply plugin: 'maven-publish'
apply plugin: 'signing'

task androidSourcesJar(type: Jar) {
    archiveClassifier.set('sources')
    if (project.plugins.findPlugin("com.android.library")) {
        // For Android libraries
        from android.sourceSets.main.java.srcDirs
        from android.sourceSets.main.kotlin.srcDirs
    } else {
        // For pure Kotlin libraries, in case you have them
        from sourceSets.main.java.srcDirs
        from sourceSets.main.kotlin.srcDirs
    }
}

artifacts {
    archives androidSourcesJar
}

group = PUBLISH_GROUP_ID
version = PUBLISH_VERSION

afterEvaluate {
    publishing {
        publications {
            release(MavenPublication) {
                // The coordinates of the library, being set from variables that
                // we'll set up later
                groupId PUBLISH_GROUP_ID
                artifactId PUBLISH_ARTIFACT_ID
                version PUBLISH_VERSION

                // Two artifacts, the `aar` (or `jar`) and the sources
                if (project.plugins.findPlugin("com.android.library")) {
                    from components.release
                } else {
                    from components.java
                }

                artifact androidSourcesJar
                artifact javadocJar

              // Mostly self-explanatory metadata
              pom {
                    name = PUBLISH_ARTIFACT_ID
                    description = 'Stream Chat official Android SDK'
                    url = 'https://github.com/getstream/stream-chat-android'
                    licenses {
                        license {
                            name = 'Stream License'
                            url = 'https://github.com/GetStream/stream-chat-android/blob/main/LICENSE'
                        }
                    }
                    developers {
                        developer {
                          id = 'zsmb13'
                          name = 'Márton Braun'
                          email = 'marton@getstream.io'
                        }
                        // Add all other devs here...
                    }

                // Version control info - if you're using GitHub, follow the 
                // format as seen here
                scm {
                        connection = 'scm:git:github.com/getstream/stream-chat-android.git'
                        developerConnection = 'scm:git:ssh://github.com/getstream/stream-chat-android.git'
                        url = 'https://github.com/getstream/stream-chat-android/tree/main'
                    }
                }
            }
        }
    }
}

signing {
    useInMemoryPgpKeys(
            rootProject.ext["signing.keyId"],
            rootProject.ext["signing.key"],
            rootProject.ext["signing.password"],
    )
    sign publishing.publications
}

publish-root.gradle

// Create variables with empty default values
ext["ossrhUsername"] = ''
ext["ossrhPassword"] = ''
ext["sonatypeStagingProfileId"] = ''
ext["signing.keyId"] = ''
ext["signing.password"] = ''
ext["signing.key"] = ''

File secretPropsFile = project.rootProject.file('local.properties')
if (secretPropsFile.exists()) {
    // Read local.properties file first if it exists
    Properties p = new Properties()
    new FileInputStream(secretPropsFile).withCloseable { is -> p.load(is) }
    p.each { name, value -> ext[name] = value }
} else {
    // Use system environment variables
    ext["ossrhUsername"] = System.getenv('OSSRH_USERNAME')
    ext["ossrhPassword"] = System.getenv('OSSRH_PASSWORD')
    ext["sonatypeStagingProfileId"] = System.getenv('SONATYPE_STAGING_PROFILE_ID')
    ext["signing.keyId"] = System.getenv('SIGNING_KEY_ID')
    ext["signing.password"] = System.getenv('SIGNING_PASSWORD')
    ext["signing.key"] = System.getenv('SIGNING_KEY')
}

// Set up Sonatype repository
nexusPublishing {
    repositories {
        sonatype {
            stagingProfileId = sonatypeStagingProfileId
            username = ossrhUsername
            password = ossrhPassword
            // Add these lines if using new Sonatype infra
            // nexusUrl.set(uri("https://s01.oss.sonatype.org/service/local/"))
            // snapshotRepositoryUrl.set(uri("https://s01.oss.sonatype.org/content/repositories/snapshots/"))
        }
    }
}

@zsmb13
Hey there, thanks for your article.
I came across this issue,
Could not find method useInMemoryPgpKeys() for arguments [XXXXXXX, <Key which I get from gpg --export-secret-keys XXXXXXX | base64> , passphrase] on object of type org.gradle.plugins.signing.SigningExtension.
Could you please help with the same?

I have this issue too

@zsmb13 Hey there, thanks for your article. I came across this issue, Could not find method useInMemoryPgpKeys() for arguments [XXXXXXX, <Key which I get from gpg --export-secret-keys XXXXXXX | base64> , passphrase] on object of type org.gradle.plugins.signing.SigningExtension. Could you please help with the same?

i am getting this error.

:base:generatePomFileForMavenAarPublication.
> Cannot query the value of this property because it has no value available.

Can you help me understand how to debug this error as i am not able to catch the exact problem.

Thanks @zsmb13.

Thanks @ThomasGorisse , it really helped me escape the error of 'Could not read PGP secret key'. And build is successful after long time.

@zsmb13 Facing this issue on Github Action only

Cannot perform signing task ':universal_adapter:signReleasePublication' because it has no configured signatory

did u find any fix? i am getting same error but on local machine