compile android using java8

build.gradle

// http://www.cnblogs.com/youxilua/archive/2013/05/20/3087935.html
// https://github.com/evant/gradle-retrolambda
// http://tools.android.com/tech-docs/new-build-system/user-guide

buildscript {
  repositories {
     mavenCentral()
  }

  dependencies {
     classpath 'com.android.tools.build:gradle:0.10.4'
     classpath 'me.tatarka:gradle-retrolambda:1.3.2'
  }
}

// Required because retrolambda is on maven central
repositories {
  mavenCentral()
}

apply plugin: 'android'
apply plugin: 'retrolambda'
apply plugin: 'eclipse'

dependencies {
  compile files('libs/android-support-v4.jar')
}

retrolambda {
  jdk System.getenv("JAVA_HOME")
  javaVersion JavaVersion.VERSION_1_7
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
    }
    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }

        instrumentTest.setRoot('tests')
    }
}