Create a task on gradle to get android project versionName from cli

build.gradle

apply plugin: 'com.android.library'
apply plugin: Version

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        minSdkVersion 10
        targetSdkVersion 23
        versionCode 1
        versionName "1.0.2"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'io.socket:socket.io-client:0.6.2'
}

// add the gradle task
class Version implements Plugin<Project>{
    public void apply(Project project) {
        project.task("Version") {
            project.gradle.projectsEvaluated {
                println "$project.android.defaultConfig.versionName"
            }
        }
    }
}
// run ./gradlew -q Version