Android基于Gradle 7.0+（8.2、8.6）使用maven-publish插件发布aar到maven仓库

maven插件与maven-publish插件的区别

maven插件适用于gradle1.0-6.2版本，6.2版本后该插件就被废弃了，推荐使用maven-publish插件。
maven-publis插件是在gradle 1.3 版本后开始支持的，使配置更加简洁。

maven-publis插件的使用

砍柴不误磨刀工，我们先来看一下官方文档。

完整示例

下面配置展示如何签署和发布 Java 库，包括源代码、Javadoc 和自定义 POM：

plugins {
    id 'java-library'
    id 'maven-publish'
    id 'signing'
}

group = 'com.example'
version = '1.0'

java {
    withJavadocJar()
    withSourcesJar()
}

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifactId = 'my-library'
            //若是war包，就写components.web,若是jar包，就写components.java 
            from components.java
            versionMapping {
                usage('java-api') {
                    fromResolutionOf('runtimeClasspath')
                }
                usage('java-runtime') {
                    fromResolutionResult()
                }
            }
            pom {
                name = 'My Library'
                description = 'A concise description of my library'
                url = 'http://www.example.com/library'
                properties = [
                    myProp: "value",
                    "prop.with.dots": "anotherValue"
                ]
                licenses {
                    license {
                        name = 'The Apache License, Version 2.0'
                        url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
                    }
                }
                developers {
                    developer {
                        id = 'johnd'
                        name = 'John Doe'
                        email = '[email protected]'
                    }
                }
                scm {
                    connection = 'scm:git:git://example.com/my-library.git'
                    developerConnection = 'scm:git:ssh://example.com/my-library.git'
                    url = 'http://example.com/my-library/'
                }
            }
        }
    }
    repositories {
        maven {
            // change URLs to point to your repos, e.g. http://my.org/repo
            def releasesRepoUrl = layout.buildDirectory.dir('repos/releases')
            def snapshotsRepoUrl = layout.buildDirectory.dir('repos/snapshots')
            url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
        }
    }
}

signing {
    sign publishing.publications.mavenJava
}


javadoc {
    if(JavaVersion.current().isJava9Compatible()) {
        options.addBooleanOption('html5', true)
    }
}

结果将发布以下工件：

POM：my-library-1.0.pom
Java 组件的主要 JAR 工件：my-library-1.0.jar
已显式配置的源 JAR 工件：my-library-1.0-sources.jar
已显式配置的 Javadoc JAR 工件：my-library-1.0-javadoc.jar

签名插件用于为每个工件生成签名文件。此外，将为所有工件和签名文件生成校验和文件。

publishToMavenLocal` 不会在$USER_HOME/.m2/repository.如果您想验证校验和文件是否已正确创建，或将其用于以后发布，请考虑使用 URL 配置自定义 Maven 存储库file://并将其用作发布目标。

from components.java

若是war包，就写components.web,若是jar包，就写components.java

如果发布的产物没有jar包就是缺少这个配置

当然有些配置你不需要，可以删除，比如删除下面配置：

id 'signing'

下面是我项目中使用的配置，当然pom的配置你可以继续跟进需要进行删减。

group = 'cn.rock.spi'
version = '0.0.1'

java {
    withJavadocJar()
    withSourcesJar()
}

//gradle 官方文档：https://docs.gradle.org/current/userguide/publishing_maven.html#publishing_maven:complete_example
publishing {
    publications {
        mavenJava(MavenPublication) {
            artifactId = 'serviceloader'
            //若是war包，就写components.web,若是jar包，就写components.java 
            from components.java
            versionMapping {
                usage('java-api') {
                    fromResolutionOf('runtimeClasspath')
                }
                usage('java-runtime') {
                    fromResolutionResult()
                }
            }
            pom {
                name = 'serviceloader library'
                description = 'A concise description of my library'
                url = 'http://www.baidu.com/library'
                properties = [
                        myProp: "value",
                        "prop.with.dots": "anotherValue"
                ]
                licenses {
                    license {
                        name = 'The Apache License, Version 2.0'
                        url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
                    }
                }
                developers {
                    developer {
                        id = 'johnd'
                        name = 'John Doe'
                        email = '[email protected]'
                    }
                }
                scm {
                    connection = 'scm:git:git://example.com/my-library.git'
                    developerConnection = 'scm:git:ssh://example.com/my-library.git'
                    url = 'http://baidu.com/my-library/'
                }
            }
        }
    }
    repositories {
        maven {
            url = uri('../repo')
            println("maven url $url")
        }
    }
}

从上图可以看出生成了doc文件和source文件，是因为下面的配置：

java {
    withJavadocJar()
    withSourcesJar()
}

maven-publish可以用的配置

一、下面是精简后的配置（基于官方推荐版本）：

group = 'cn.rock.spi'
version = '0.0.1'


publishing {
    publications {
        mavenJava(MavenPublication) {
            artifactId = 'serviceloader'
            from components.java
        }
    }
    repositories {
        maven {
            url = uri('../repo')
        }
    }
}

发布插件

这个时候，点击下Sync同步下代码，然后可以在右侧Gradle的Tab中，找到publishing，里面有publish选项，我们双击它，就开始执行发布插件的操作了。

如果你的Android Studio 在配置后没有publishing的task，参考下面方法。

解决方案（Mac）
点击Android Studio–>Preference–>选择Experimental(实验性选项)–>在Gradle一栏中取消勾选"Do not build Gradle task list during Gradle sync"

或者勾选下面的选项

点击File–>Sync Project with Gradle Files即可

第二种配置

如果你比较喜欢恋旧，下面的配置也是可以的。

afterEvaluate {
    publishing {
        //配置maven-publishing插件的输出物
        publications {
            mavenJava(MavenPublication) {
                groupId = 'cn.rock.spi'
                artifactId = 'serviceloader'
                version = '0.0.1'
                from components.java
            }
        }

        repositories {
            maven {
                url = uri('../repo')
            }
        }
    }
}

注意：

使用mavenJava(MavenPublication)

引用：


dependencies {

    implementation 'cn.rock.spi:serviceloader:0.0.1'
}

完整demo：

https://github.com/jdsjlzx/spi

GitHub - jdsjlzx/NewSpi: Android中SPI思想应用与改进

其他版本一：

apply plugin: 'com.android.library'
apply plugin: 'maven-publish'
apply plugin: 'digital.wup.android-maven-publish'

android {
    compileSdkVersion "33" as int

    defaultConfig {
        ......

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        consumerProguardFiles 'consumer-rules.pro'
    }

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

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
   

}

dependencies {

}

def VERSION = "0.9.3.3"
def GROUP_ID = "com.baidu.sdk"
def ARTIFACT_ID = "ARTIFACT_ID"
def MAVEN_USERNAME = "username"
def MAVEN_PASSWORD = "123456"
def MAVEN_URL = "http://www.baidu.com"


afterEvaluate {
    publishing {
//    配置maven-publishing插件的输出物
        publications {
            maven(MavenPublication) {
                afterEvaluate { artifact(tasks.getByName("bundleReleaseAar"))}
                groupId = GROUP_ID
                artifactId = ARTIFACT_ID
                version = VERSION
            }
        }
        repositories {
            maven {
                credentials {
                    username MAVEN_USERNAME
                    password MAVEN_PASSWORD
                }
                url = MAVEN_URL
            }
        }
    }
}

其他版本二：

apply plugin: 'maven-publish'

ext {
    GROUP_ID = "com.baidu.group"
    ARTIFACT_ID = "im-sdk"
    VERSION_NAME = "0.0.1"
}

//声明变量记录上传Maven库地址
def repositoryUrl
//判断发到正式库还是snapshot库
if (isReleaseBuild()) {
    //上传Release私有仓库
    repositoryUrl = "https://baidu.com/"
} else {
    println 'SNAPSHOT Versions'
    //上传snapshot私有仓库
    repositoryUrl = "http://baidu.com/debug/"
}

//从项目gradle.properties中读取Nexus服务器登录用户名
def getRepositoryUserName() {
//    return hasProperty('USERNAME') ? USERNAME : ""
    return "autoai-AVS"
}
//读取Nexus服务器登录密码
def getRepositoryPassword() {
//    return hasProperty('PASSWORD') ? PASSWORD : ""
    return "@pIbl9kE"
}

def isReleaseBuild() {
    return !VERSION_NAME.contains("SNAPSHOT")
}

afterEvaluate {

    task generateSourcesJar(type: Jar) {
        from android.sourceSets.main.java.srcDirs
        classifier 'sources'
    }

    publishing {
        publications {
            release(MavenPublication) {
                if (project.getPlugins().hasPlugin('com.android.application') ||
                        project.getPlugins().hasPlugin('com.android.library'))
                    from(components.release)
                else
                    from(components.java)
                pom {
                    groupId = GROUP_ID
                    version = VERSION_NAME
                    artifactId = ARTIFACT_ID
                }

                artifact generateSourcesJar
            }
        }
        repositories {
            maven {
                credentials {
                    username getRepositoryUserName()
                    password getRepositoryPassword()
                }
                url repositoryUrl
            }
        }
    }
}