Correct Gradle build file to use Android annotations library

Android annotations Gradle build file

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()

    maven {
        url 'https://oss.sonatype.org/content/repositories/snapshots/'
    }
}

ext.androidAnnotationsVersion = '3.0-SNAPSHOT';

configurations {
    apt
}

dependencies {
    compile 'com.android.support:support-v4:13.0.+'

    apt "com.googlecode.androidannotations:androidannotations:${androidAnnotationsVersion}"
    compile "com.googlecode.androidannotations:androidannotations-api:${androidAnnotationsVersion}"
}

android {
    compileSdkVersion 17
    buildToolsVersion "17.0.0"

    defaultConfig {
        minSdkVersion 10
        targetSdkVersion 17
    }
}

def getSourceSetName(variant) {
    return new File(variant.dirName).getName();
}

android.applicationVariants.all { variant ->
    def aptOutputDir = project.file("build/source/apt")
    def aptOutput = new File(aptOutputDir, variant.dirName)
    println "****************************"
    println "variant: ${variant.name}"
    println "manifest:  ${variant.processResources.manifestFile}"
    println "aptOutput:  ${aptOutput}"
    println "****************************"

    android.sourceSets[getSourceSetName(variant)].java.srcDirs += aptOutput.getPath()

    variant.javaCompile.options.compilerArgs += [
            '-processorpath', configurations.apt.getAsPath(),
            '-processor', 'com.googlecode.androidannotations.AndroidAnnotationProcessor',
            '-AandroidManifestFile=' + variant.processResources.manifestFile,
            '-s', aptOutput
    ]

    variant.javaCompile.source = variant.javaCompile.source.filter { p ->
        return !p.getPath().startsWith(aptOutputDir.getPath())
    }

    variant.javaCompile.doFirst {
        aptOutput.mkdirs()
    }
}