bintrayUpload.gradle

apply plugin: 'com.github.dcendents.android-maven'
apply plugin: 'com.jfrog.bintray'

// load properties
Properties properties = new Properties()
File localPropertiesFile = project.file("local.properties");
if (localPropertiesFile.exists()) {
    properties.load(localPropertiesFile.newDataInputStream())
}
File projectPropertiesFile = project.file("project.properties");
if (projectPropertiesFile.exists()) {
    properties.load(projectPropertiesFile.newDataInputStream())
}

// read properties
def projectName = properties.getProperty("project.name")
def projectDescription = properties.getProperty("project.description")
def projectGroupId = properties.getProperty("project.groupId")
def projectArtifactId = properties.getProperty("project.artifactId")
def projectVersionName = android.defaultConfig.versionName
def projectPackaging = properties.getProperty("project.packaging")
def projectSiteUrl = properties.getProperty("project.siteUrl")
def projectGitUrl = properties.getProperty("project.gitUrl")
def licenceName = properties.getProperty("project.licenceName")
def licenceUrl = properties.getProperty("project.licenceUrl")

def developerId = properties.getProperty("developer.id")
def developerName = properties.getProperty("developer.name")
def developerEmail = properties.getProperty("developer.email")

def passphraseKey = properties.getProperty("bintray.gpg.password")

def bintrayUser = properties.getProperty("bintray.user")
def bintrayApikey = properties.getProperty("bintray.apikey")

def javadocName = properties.getProperty("javadoc.name")

group = projectGroupId

// This generates POM.xml with proper parameters
install {
    repositories.mavenInstaller {
        pom {
            project {
                name projectName
                description projectDescription
                groupId projectGroupId
                artifactId projectArtifactId
                version projectVersionName
                packaging projectPackaging
                url projectSiteUrl
                licenses {
                    license {
                        name licenceName
                        url licenceUrl
                    }
                }
                developers {
                    developer {
                        id developerId
                        name developerName
                        email developerEmail
                    }
                }
                scm {
                    connection projectGitUrl
                    developerConnection projectGitUrl
                    url projectSiteUrl
                }
            }
        }
    }
}

// This generates sources.jar
task sourcesJar(type: Jar) {
    from android.sourceSets.main.java.srcDirs
    classifier = 'sources'
}

task javadoc(type: Javadoc) {
    source = android.sourceSets.main.java.srcDirs
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
}

// This generates javadoc.jar
task javadocJar(type: Jar, dependsOn: javadoc) {
    classifier = 'javadoc'
    from javadoc.destinationDir
}

artifacts {
    archives javadocJar
    archives sourcesJar
}

// javadoc configuration
javadoc {
    options {
        encoding "UTF-8"
        charSet 'UTF-8'
        author true
        version projectVersionName
        links "http://docs.oracle.com/javase/7/docs/api"
        title javadocName
    }
}

// bintray configuration
bintray {
    user = bintrayUser
    key = bintrayApikey
    configurations = ['archives']
    pkg {
        repo = "maven"
        name = projectName
        description = projectDescription
        websiteUrl = projectSiteUrl
        vcsUrl = projectGitUrl
        licenses = [licenceName]
        publish = false
        version {
            gpg {
                sign = true //Determines whether to GPG sign the files. The default is false
                passphrase = passphraseKey
            }
        }

    }
}