ขั้นตอนการ Upload Android Library ไปที่ Maven Central

apply plugin: 'maven'
apply plugin: 'signing'

def sonatypeRepositoryUrl
if (isReleaseBuild()) {
    println 'RELEASE BUILD'
    sonatypeRepositoryUrl = hasProperty('RELEASE_REPOSITORY_URL') ? RELEASE_REPOSITORY_URL
            : "https://oss.sonatype.org/service/local/staging/deploy/maven2/"
} else {
    println 'DEBUG BUILD'
    sonatypeRepositoryUrl = hasProperty('SNAPSHOT_REPOSITORY_URL') ? SNAPSHOT_REPOSITORY_URL
            : "https://oss.sonatype.org/content/repositories/snapshots/"
}

def getRepositoryUsername() {
    return hasProperty('nexusUsername') ? nexusUsername : ""
}

def getRepositoryPassword() {
    return hasProperty('nexusPassword') ? nexusPassword : ""
}

afterEvaluate { project ->
    uploadArchives {
        repositories {
            mavenDeployer {
                beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }

                pom.artifactId = POM_ARTIFACT_ID

                repository(url: sonatypeRepositoryUrl) {
                    authentication(userName: getRepositoryUsername(), password: getRepositoryPassword())
                }

                pom.project {
                    name POM_NAME
                    packaging POM_PACKAGING
                    description POM_DESCRIPTION
                    url POM_URL

                    scm {
                        url POM_SCM_URL
                        connection POM_SCM_CONNECTION
                        developerConnection POM_SCM_DEV_CONNECTION
                    }

                    licenses {
                        license {
                            name POM_LICENCE_NAME
                            url POM_LICENCE_URL
                            distribution POM_LICENCE_DIST
                        }
                    }

                    developers {
                        developer {
                            id POM_DEVELOPER_ID
                            name POM_DEVELOPER_NAME
                        }
                    }
                }
            }
        }
    }

    signing {
        required { isReleaseBuild() && gradle.taskGraph.hasTask("uploadArchives") }
        sign configurations.archives
    }

    task androidJavadocs(type: Javadoc) {
        source = android.sourceSets.main.java.sourceFiles
    }

    task androidJavadocsJar(type: Jar) {
        classifier = 'javadoc'
        //basename = artifact_id
        from androidJavadocs.destinationDir
    }

    task androidSourcesJar(type: Jar) {
        classifier = 'sources'
        //basename = artifact_id
        from android.sourceSets.main.java.sourceFiles
    }

    artifacts {
        //archives packageReleaseJar
        archives androidSourcesJar
        archives androidJavadocsJar
    }
}

    apply plugin: 'maven'
    apply plugin: 'signing'

VERSION_NAME=0.0.1
VERSION_CODE=1
GROUP=com.devahoy

POM_DESCRIPTION=A Simple Android SharedPreferences
POM_URL=https://github.com/devahoy/shared
POM_SCM_URL=https://github.com/devahoy/shared
POM_SCM_CONNECTION=scm:git@github.com:devahoy/shared.git
POM_SCM_DEV_CONNECTION=scm:git@github.com:devahoy/shared.git
POM_LICENCE_NAME=The Apache Software License, Version 2.0
POM_LICENCE_URL=http://www.apache.org/licenses/LICENSE-2.0.txt
POM_LICENCE_DIST=repo
POM_DEVELOPER_ID=phonbopit
POM_DEVELOPER_NAME=Chai Phonbopit

├── build
│   └── intermediates
├── build.gradle
├── gradle
│   └── wrapper
├── gradle.properties
├── gradlew
├── gradlew.bat
├── library
│   ├── build.gradle
│   ├── gradle.properties
│   ├── library.iml
│   ├── libs
│   ├── proguard-rules.pro
│   └── src
├── LICENSE.txt
├── local.properties
├── maven_push.gradle
├── README.md
├── settings.gradle
└── Shared.iml

    POM_NAME=Shared
    POM_ARTIFACT_ID=shared
    POM_PACKAGING=aar

    dependencies {
        compile 'GROUP_ID:POM_ARTIFACT_ID:VERSION_CODE'
    }

    apply from: '../maven_push.gradle'

sudo apt-get install gnupg

gpg --gen-key

Please select what kind of key you want:
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (sign only)
   (4) RSA (sign only)
Your selection? 1
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048) 4096
Requested keysize is 4096 bits
Please specify how long the key should be valid.
         0 = key does not expire
      <n>  = key expires in n days
      <n>w = key expires in n weeks
      <n>m = key expires in n months
      <n>y = key expires in n years
Key is valid for? (0) 0
Key does not expire at all
Is this correct? (y/N) y

You need a user ID to identify your key; the software constructs the user ID
from the Real Name, Comment and Email Address in this form:
    "Heinrich Heine (Der Dichter) <heinrichh@duesseldorf.de>"

Real name: DevAhoy
Email address: hello@devahoy.com
Comment:
You selected this USER-ID:
    "DevAhoy <hello@devahoy.com>"

Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
You need a Passphrase to protect your secret key.

We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.

gpg --list-keys

pub   4096R/XXXXXXXX 2014-11-25
uid                  DevAhoy <hello@devahoy.com>

    gpg --keyserver hkp://keyserver.ubuntu.com --send-keys XXXXXXXX
    $ gpg --keyserver hkp://pgp.mit.edu --send-keys XXXXXXXX

signing.keyId=PUB_ID
signing.password=YOUR_PASSPHRASE
signing.secretKeyRingFile=/home/UserName/.gnupg/secring.gpg

nexusUsername=YOUR_NEXUS_USERNAME
nexusPassword=YOUR_NEXUS_PASSWORD

    gradle uploadArchives

Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1.aar to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 52K from remote
Uploaded 52K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1-sources.jar.asc to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 0K from remote
Uploaded 0K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1.aar.asc to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 0K from remote
Uploaded 0K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1-javadoc.jar.asc to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 0K from remote
Uploaded 0K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1-javadoc.jar to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 0K from remote
Uploaded 0K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1-sources.jar to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 1K from remote
Uploaded 1K
Uploading: com/devahoy/library/0.0.1/library-0.0.1-20141125.161932-1.pom.asc to repository remote at https://oss.sonatype.org/content/repositories/snapshots/
Transferring 0K from remote
Uploaded 0K

BUILD SUCCESSFUL

    dependencies {
        compile 'com.devahoy:shared:0.0.1'
    }