------------------------------------------------------------------------------------
      activity_main.xml
-------------------------------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:completionHint="선택하세요"
        android:completionThreshold="2"
        android:hint="자동완성텍스트뷰" >
    </AutoCompleteTextView>

    <MultiAutoCompleteTextView
        android:id="@+id/multiAutoCompleteTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:completionHint="선택하세요"
        android:completionThreshold="2"
        android:hint="멀티자동완성텍스트뷰" />

</LinearLayout>

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

        var items = arrayOf("CSI-뉴욕", "CSI-라스베가스", "CSI-마이애미", "Friends", "Fringe", "Lost")

        var auto = findViewById<AutoCompleteTextView>(R.id.autoCompleteTextView1)
        var adapter = ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, items)
        auto.setAdapter(adapter)

        var multi = findViewById<MultiAutoCompleteTextView>(R.id.multiAutoCompleteTextView1)
        var token = MultiAutoCompleteTextView.CommaTokenizer()
        multi.setTokenizer(token)
        multi.setAdapter(adapter)
    }
}