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  activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:textStyle="bold"/>

</androidx.constraintlayout.widget.ConstraintLayout>

--------------------------------------------------------------------------------
    MainActivity.kt
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class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        var textView : TextView = findViewById(R.id.textView);

        //문자
        var mString : String = "EmbeddedKorea";
        val isChar: Char='K';

        //정수
        var mInt : Int = -300;
        var mLong : Long = -3;

        // unsigned 정수
        var mUInt : UInt = 123u;
        var mULong : ULong = 3u;

        //실수
        var mDouble : Double = 2.3;
        var mFloat : Float = 4.0f;

        //논리형
        val isReal: Boolean;
        isReal=false;

        //Byte
        val isByte: Byte;
        isByte=-123;

        //UByte
        val isUByte: UByte;
        isUByte=123u;

        //Show
        val isShort: Short;
        isShort=-456;

        //Show
        val isUShort: UShort;
        isUShort=456u;

        //Any
        val isAnyInt1: Any?;
        val isAnyInt2: Any;
        isAnyInt1=10;
        isAnyInt2=isAnyInt1;

        val isAnyString: Any;
        isAnyString="kilsung";

        //텍스트뷰에 담기
        textView.append("String: " + mString + "\n");
        textView.append("Char: " + isChar+ "\n");

        textView.append("Int: " + mInt.toString() + "\n");
        textView.append("UInt: " + mUInt.toString() + "\n");

        textView.append("Long: " + mLong.toString() + "\n");
        textView.append("ULong: " + mULong.toString() + "\n");

        textView.append("Double: " + mDouble.toString() + "\n");
        textView.append("Float: " + mFloat.toString() + "\n");
        textView.append("Boolean: " + isReal.toString() + "\n");

        textView.append("Byte: " + isByte.toString() + "\n");
        textView.append("UByte: " + isUByte.toString() + "\n");

        textView.append("Short: " + isShort.toString() + "\n");
        textView.append("UShort: " + isUShort.toString() + "\n");

        textView.append("Any Int1: " + isAnyInt1.toString() + "\n");
        textView.append("Any Int2: " + isAnyInt2.toString() + "\n");
        textView.append("Any String: " + isAnyString.toString() + "\n");
    }
}