Gradle Plugin to help with apk naming using a combination of application name, variant and version number

artifacts.gradle

android.applicationVariants.all { variant ->
    def appName
    //Check if an applicationName property is supplied; if not use the name of the parent project.
    if (project.hasProperty("applicationName")) {
        appName = applicationName
    } else {
        appName = "app"
    }

    variant.outputs.each { output ->
        def newApkName
        //If there's no ZipAlign task it means that our artifacts will be unaligned and we need to mark it as such.
        if (output.zipAlign) {
            newApkName = "${appName}-${output.baseName}-${variant.versionName}.apk"
        } else {
            newApkName = "${appName}-${output.baseName}-${variant.versionName}-unaligned.apk"
        }
        //noinspection GroovyAssignabilityCheck
        output.outputFile = new File(output.outputFile.parent, newApkName)
    }
}

To use
Put the artifacts.gradle file in your project root.

In your build.gradle; add the line
apply from: "../artifacts.gradle"