lambada使用需求

1、使用lambada需要在build.gradle里面的andorid根节点下面加入：compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

    }  

2、添加apply plugin: 'me.tatarka.retrolambda'

3、在工作空间哪里添加lambada依赖

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.0'
        classpath 'me.tatarka:gradle-retrolambda:3.3.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}