插件安裝

安裝這個(gè)kotlin插件

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1. project的build.gradle配置

1. buildscript新增ext.kotlin_version = '1.1.2-4'
2. dependencies新增classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
3. allprojects新增mavenCentral()

2. module的build.gradle配置

1. 新增插件支持

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

2. android新增

 sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

3. dependencies新增

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

總配置

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.1.2-4'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.1'
        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()
        mavenCentral()
    }
}

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

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.happy.kotlindemo"
        minSdkVersion 15
        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 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}

所有都配置好了之后，選擇一個(gè)Activity文件，選擇code->convet java file...

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大功告成

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