使用kotlin遇到的问题

这是在项目中使用kotlin开发遇见的问题

1 Unresolved reference: java

在项目的gradle中

buildscript {
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
        mavenCentral()

    }
    ext.kotlin_version = '1.2.41'
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'
        
        //kotlin
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
      
    }
}
    

2调用kotlin 文件出现包名找不到

在app 的gradle中配置

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

3 Unresolved reference: databinding

databinding和kotlin冲突

在项目的build.gradle中

ext.android_plugin_version = '2.3.0'
 
下边是完整配置 

buildscript {
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
        mavenCentral()

    }
    ext.kotlin_version = '1.2.51'
    ext.android_plugin_version = '2.3.0'

    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'
 

        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

    }
}

在app build.gradle中添加

apply plugin: 'kotlin-kapt'

android{
      sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
}
kapt {
    generateStubs = true
}
dependencies {

        kapt "com.android.databinding:compiler:$android_plugin_version"
}