其他保證正確的前提下：Project的gradle：

buildscript {
    ext.kotlin_version = '1.1.2-4'
repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "org.jetbrains.kotlin:kotlin-android-extensions:
 
$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
}
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

dependencies {
    compile fileTree(dir
 
: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:25.3.1'
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}