signing release APK - complete Gradle build script

build.gradle

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:0.9.+'
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '1.11'
}

tasks.whenTaskAdded { task ->
    if (task.name == 'validateReleaseSigning')
        task.dependsOn keystoreInfo
}

apply plugin: 'android'

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 19
    buildToolsVersion '19.0.3'

    defaultConfig {
        minSdkVersion 10
        targetSdkVersion 19
    }

    signingConfigs {
        release {
            release {
                storeFile file('release.keystore')
                storePassword ''
                keyAlias ''
                keyPassword ''
            }
        }
        buildTypes {
            release {
                debuggable false
                jniDebugBuild false
                signingConfig signingConfigs.release
            }
        }
    }
}

task keystoreInfo << {
    def console = System.console()
    if (console == null)
        throw new IllegalStateException('no console available, use --no-daemon flag')

    def storeFile = console.readLine('Keystore file: ')
    def storePassword = console.readPassword('Keystore password: ')
    def keyAlias = console.readLine('Key alias: ')
    def keyPassword = console.readPassword('Key password: ')

    android.signingConfigs.release.storeFile = file(storeFile)
    android.signingConfigs.release.storePassword = new String(storePassword)
    android.signingConfigs.release.keyAlias = keyAlias
    android.signingConfigs.release.keyPassword = new String(keyPassword)
}