repositories {
    google()
    jcenter()
}

dependencies {
    classpath 'com.android.tools.build:gradle:3.2.0-alpha16'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-alpha01"
    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}

  App:
  apply plugin: "androidx.navigation.safeargs"
 implementation "android.arch.navigation:navigation-fragment:$nav_version" // use -ktx for Kotlin
implementation "android.arch.navigation:navigation-ui:$nav_version" // use -ktx for Kotlin



用As3.2 Gradle 4.6