// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {ext.kotlin_version = '1.0.6'repositories {jcenter()}dependencies {classpath 'com.android.tools.build:gradle:2.0.0'classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"}
}allprojects {repositories {jcenter()}

添加了版本号以及要使用的俩个依赖，如果需要还可以导入其他的依赖。

在app的目录（也就是你android代码目录）的build.gradle文件中添加简单的设置就好
看示例：

buildscript {repositories {jcenter()}dependencies {classpath 'com.android.tools.build:gradle:2.0.0'}
}def getDate() {return Calendar.getInstance().getTimeInMillis();
}allprojects {repositories {jcenter()}
}
apply plugin:  'com.android.application'
apply plugin: 'kotlin-android'dependencies {compile 'com.android.support:support-v4:23.1.1'compile 'com.android.support:appcompat-v7:23.1.1'compile 'com.android.support:design:23.1.1'compile 'com.android.support:preference-v7:23.1.1'compile 'org.apache.commons:commons-compress:1.10'compile 'commons-net:commons-net:3.3'compile 'com.github.zafarkhaja:java-semver:0.9.0'compile 'org.unbescape:unbescape:1.1.1.RELEASE'compile 'org.msgpack:msgpack:0.6.12'compile 'com.googlecode.juniversalchardet:juniversalchardet:1.0.3'compile 'org.tukaani:xz:1.5'compile 'ch.acra:acra:4.6.2'testCompile 'junit:junit:4.12'compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}android {compileSdkVersion 23buildToolsVersion '23.0.2'compileOptions {sourceCompatibility JavaVersion.VERSION_1_7targetCompatibility JavaVersion.VERSION_1_7}packagingOptions {exclude 'META-INF/LICENSE.txt'exclude 'META-INF/NOTICE.txt'}defaultConfig {minSdkVersion 9targetSdkVersion 22versionCode 4versionName "1.7.0-unstable"if(System.getenv("NIGHTLY_BUILD")) {versionName += "+" + System.getenv("NIGHTLY_BUILD_COMMIT").substring(0, 7)}}lintOptions {if (System.getenv("NIGHTLY_BUILD")) {checkReleaseBuilds false}abortOnError false}signingConfigs {release {if (System.getenv("KEYSTORE_FILE") != null) {storeFile = file(System.getenv("KEYSTORE_FILE"))storePassword = System.getenv("KEYSTORE_PWD")keyAlias = System.getenv("KEYSTORE_ALIAS")keyPassword = System.getenv("KEYSTORE_ALIAS_PWD")}return true}}buildTypes {debug {buildConfigField "java.util.Date", "BUILD_TIME", "new java.util.Date(" + getDate() + "L)"buildConfigField "String", "BUILD_NAME", "\"" + System.getenv("USER") + "\"";minifyEnabled falseshrinkResources falsedebuggable truejniDebuggable truezipAlignEnabled truemultiDexEnabled true}release {buildConfigField "java.util.Date", "BUILD_TIME", "new java.util.Date(" + getDate() + "L)"buildConfigField "String", "BUILD_NAME", "\"" + System.getenv("USER") + "\"";if (System.getenv("KEYSTORE_FILE") != null) {signingConfig signingConfigs.release}multiDexEnabled truereturn true}}sourceSets {main.java.srcDirs += 'src/main/kotlin'}
}
repositories {mavenCentral()
}

主要添加了有3个地方：
1、

   apply plugin: 'kotlin-android'

2、

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

3、

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

这样就可以正常使用了。

如果出现
Execution failed for task ':app:clean'.
> Unable to delete file: C:\Users\User\KotlinGameEngine\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.0.1\jars\classes.jar
类似这样的问题，那么只要在app目录下的build.gradle文件中添加task：

   task clean(type: Exec) {ext.lockhunter = '\"C:\\LockHunter.exe\"'def buildDir = file(new File("build"))commandLine 'cmd', "$lockhunter", '/delete', '/silent', buildDir
}

如果出现Unresolved reference: kotlinx这样的问题，那么需要在app目录下的build.gradle文件中添加：
apply plugin: 'kotlin-android-extensions'
以及要确保classpath配置了classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"