// Top-level build file where you can add configuration options common to all sub-projects/modules.
ext.kotlin_version = '1.1.2'
buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath 'com.android.tools.build:gradle:2.3.0'

    // 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
}

ext.kotlin_version = '1.1.2'

buildscript {
  repositories {
    jcenter()
  }
  dependencies {
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
  }
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
  compileSdkVersion 25
  buildToolsVersion "25.0.2"
  defaultConfig {
    applicationId "com.zxf.kotlin"
    minSdkVersion 15
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
  }
  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
//  sourceSets {
//    main.java.srcDirs += 'src/main/kotlin'
//  }
}

dependencies {
  compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
  compile 'com.android.support:appcompat-v7:25.1.1'
  compile 'com.android.support.constraint:constraint-layout:1.0.0-beta4'
}

buildscript {
 repositories {
   jcenter()
 }
 dependencies {
   classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
   classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
 }
}
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

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

package com.zxf.kotlin

import android.os.Bundle
import android.support.v7.app.AppCompatActivity

class KotlinActivity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_kotlin)
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/helloWorld"/>

  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/open_next"/>
</LinearLayout>

    helloWorld.text = "hello world"
    open_next.text = "Open Next Activity"
    open_next.setOnClickListener { startActivity(Intent(KotlinActivity@this,SecondActivity::class.java)) }