Kotlin(二)

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配置Gradle

首先，你需要如下修改父build.gradle：

buildscript {    ext.kotlin_version = '1.1.2-4'    ext.anko_version = '0.8.2'    repositories {        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.2'        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}

其次，在app下的build.gradle中：

apply plugin: 'com.android.application'apply plugin: 'kotlin-android'android {    compileSdkVersion 25    buildToolsVersion "25.0.2"    defaultConfig {        applicationId "com.zhoujian.testactivity"        minSdkVersion 11        targetSdkVersion 25        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}sourceSets {    main.java.srcDirs += 'src/main/kotlin'}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    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:$kotlin_version"    compile "org.jetbrains.anko:anko-common:$anko_version"    compile 'com.android.support:appcompat-v7:25.3.1'    compile 'com.android.support.constraint:constraint-layout:1.0.0-beta4'    testCompile 'junit:junit:4.12'}repositories {    mavenCentral()}

重新Make project

把MainActivity转换成Kotlin代码

选中MainActivity，然后选择Code -> Convert Java File to Kotlin File

package com.zhoujian.kotlindemoimport android.os.Bundleimport android.support.v7.app.AppCompatActivityclass MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)    }}

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