Kotlin + android Studio

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1, 在 AS 中安装 Kotlin插件，（貌似 AS 3.0 已经集成了 Kotlin）

2,在项目中的 build.gradle 中添加 ext.kotlin_version=''(当前最新的 kotlin version)

buildscript {    ext.kotlin_version = '1.1.51'    repositories {        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.3'        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"        // 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}

3. 在 App 中的 build.gradle 中添加 apply plugin:'kotlin-android'

apply plugin:'kotlin-android-extensions' 和

compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

apply plugin: 'com.android.application'apply plugin: 'kotlin-android'apply plugin: 'kotlin-android-extensions'android {    compileSdkVersion 26    buildToolsVersion "26.0.1"    defaultConfig {        applicationId "kotiln.chc.com"        minSdkVersion 15        targetSdkVersion 26        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    compile fileTree(include: ['*.jar'], dir: 'libs')    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {        exclude group: 'com.android.support', module: 'support-annotations'    })    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"    compile 'com.android.support.constraint:constraint-layout:1.0.2'    testCompile 'junit:junit:4.12'    compile 'com.android.support:support-v4:26.0.0-alpha1'    compile 'com.android.support:appcompat-v7:26.0.0-alpha1'}repositories {    mavenCentral()}

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