Kotlin 画面回転後、横画面のみにする

画面回転後、縦画面をせず、横画面のみにする

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.nagatadaisuke.sampleorientation" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN"
                        android:configChanges="orientation|screenSize"/>

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</

MainActivity

package com.example.nagatadaisuke.sampleorientation

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.content.pm.ActivityInfo
import android.content.res.Configuration


class MainActivity : AppCompatActivity() {

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

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE)
    }

    /*
     * 画面回転を検出
     *
     */
   override fun onConfigurationChanged(newConfig: Configuration) {
        when (newConfig.orientation) {
            Configuration.ORIENTATION_PORTRAIT -> {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE)
            }
            Configuration.ORIENTATION_LANDSCAPE -> {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE)
            } else -> {
            }
        }
        super.onConfigurationChanged(newConfig)
    }
}