Kotlinでunresolved referenceが出ます。

Question

###前提・実現したいこと
MainActivity.ktでUser.ktとActionViewの定義したクラスを参照したいです。

###発生している問題・エラーメッセージ

unresolved reference

MainActivityで、他のファイルのクラスを参照できません。

###該当のソースコード

参照したいのは、User.ktのUserクラスとActionView.ktのActionViewクラスです。

MainActivity

package sample.qiitaclient

import android.os.Bundle
import android.support.design.widget.FloatingActionButton
import android.support.design.widget.Snackbar
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.Toolbar
import android.view.View
import android.view.Menu
import android.view.MenuItem
import sample.qiitaclient.model.Article

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val toolbar = findViewById(R.id.toolbar) as Toolbar
        setSupportActionBar(toolbar)

        val fab = findViewById(R.id.fab) as FloatingActionButton
        fab.setOnClickListener { view ->
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show()
        }

        val articleView = ★ArticleView★(applicationContext)★unresolved reference★

        articleView.setArticle(Article(id="123",
                title = "Kotlin入門",
                url = "http://www.example.com/articles/123",
                user = ★User★(id = "456", name = "たろう", profileImageUrl = "")))★unresolved reference★
        setContentView(articleView)

    }
}

java/sampleqiitaclient/model/User.kt

package sample.qiitaclient.model



data class User(val id: String,
                val name: String,
                val profileImageUrl: String)

java/sampleqiitaclient/view/ActionView.kt

package sample.qiitaclient.view




import android.content.Context
import android.graphics.Color
import android.util.AttributeSet
import android.view.LayoutInflater
import android.widget.FrameLayout
import android.widget.ImageView
import android.widget.TextView
import sample.qiitaclient.R
import sample.qiitaclient.model.Article

class ArticleView : FrameLayout {

    constructor(context: Context?) : super(context)
    constructor(context: Context?,
                attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context?,
                attrs: AttributeSet?,
                defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    constructor(context: Context?,
                attrs: AttributeSet?,
                defStyleAttr: Int,
                defStyleRes: Int) : super(context, attrs, defStyleAttr, defStyleRes)

    var profileImageView: ImageView? = null
    var titleTextView: TextView? = null
    var userNameTextView: TextView? = null

    init {
        LayoutInflater.from(context).inflate(R.layout.view_article, this)
        profileImageView = findViewById(R.id.profile_image_view) as ImageView
        titleTextView = findViewById(R.id.title_text_view) as TextView
        userNameTextView = findViewById(R.id.user_name_text_view) as TextView
    }

    fun setArticle(article: Article) {
        titleTextView?.text = article.title
        userNameTextView?.text = article.user.name

        profileImageView?.setBackgroundColor(Color.RED)
    }
}

ネットで調べたところ、kotlinの初期設定に問題がある可能性もあるようですので、
gradleも載せますm(_ _)m

build.gradle(Project)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.1.2-4'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // 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
}

build.gradle(Module)

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

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"

    defaultConfig {
        applicationId "sample.qiitaclient"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:design:25.3.1'
    testCompile 'junit:junit:4.12'
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}
repositories {
    mavenCentral()
}

###補足情報(言語/FW/ツール等のバージョンなど)
AndroidStudio 2.3.1
Kotlin 1.1.2-2

Answer 1

importすればいいんですね。。。

MainActivity

import sample.qiitaclient.model.User
import sample.qiitaclient.view.ArticleView